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List of Special Days and National Days in May in United States.
National Day
When is observed
National Concert Day has always been observed annually on the first Tuesday of May.
Poem on Your Pillow Day has always been observed annually on the first Tuesday of May.
World Asthma Day has always been observed annually on the first Tuesday of May.
Great American Grump Out has always been observed annually on the first Wednesday of May.
National Anxiety Disorders Screening Day has always been observed annually on the first Wednesday of May.
Lag B’omer has always been observed annually on the 18th of Iyyar in the Hebrew calendar.
Martin Z. Mollusk Day has always been observed annually on the first Thursday of May.
National Day of Prayer has always been observed annually on the first Thursday of May.
National Day of Reason has always been observed annually on the first Thursday of May.
World Password Day has always been observed annually on the first Thursday of May.
International Space Day has always been observed annually on the first Friday of May.
International Tuba Day has always been observed annually on the first Friday of May.
No Pants Day has always been observed annually on the first Friday of May.
Beer Pong Day has always been observed annually on the first Saturday of May.
Bladder Cancer Awareness Day has always been observed annually on the first Saturday of May.
Childhood Stroke Awareness Day has always been observed annually on the first Saturday of May.
HerbDay has always been observed annually on the first Saturday of May.
Free Comic Book Day has always been observed annually on the first Saturday of May.
Join Hands Day has always been observed annually on the first Saturday of May.
Kentucky Derby has always been observed annually on the first Saturday of May.
National Homebrew Day has always been observed annually on the first Saturday of May.
National Scrapbooking Day has always been observed annually on the first Saturday of May.
Pilates Day has always been observed annually on the first Saturday of May.
International Bereaved Mother’s Day also known as International Babylost Mother’s Day. It has always been observed annually on the first Sunday of May.
International Permaculture Day has always been observed annually on the first Sunday of May.
Mayday for Mutts has always been observed annually on the first Sunday of May.
Motorcycle Mass and Blessing of the Bikes Day has always been observed annually on the first Sunday of May.
Lemonade Day has always been observed annually on the first Sunday of May.
National Infertility Survival Day has always been observed annually on the Sunday before Mother’s Day.
World Laughter Day has always been observed annually on the first Sunday of May.
No Homework Day Observed the last Friday of March and annually on May 6th.
Great Lakes Awareness Day has always been observed annually on Monday of the first full week of May.
Melanoma Monday has always been observed annually on the first Monday of May.
National Meeting Planners Appreciation Day has always been observed annually on Monday of the first full week of May.
Childhood Depression Awareness Day also known as Green Ribbon Day. Observed Tuesday of the first full week of May.
National Teacher Day also known as Teacher Appreciation Day. Observed Tuesday of the first full week of May.
Bike To School Day has always been observed annually on Wednesday of the first full week of May.
Donate a Day’s Wages to Charity Day has always been observed annually on the second Wednesday of May.
National Root Canal Appreciation Day has always been observed annually on the second Wednesday of May.
National Receptionists’ Day has always been observed annually on the second Wednesday of May.
National School Nurse Day has always been observed annually on Wednesday of the first full week of May.
National Third Shift Workers Day also known as National Night Shift Workers Day. Observed the second Wednesday of May.
Occupational Safety and Health Professional Day has always been observed annually on Wednesday of the first full week of May.
Ascension Observed 39 days after Easter.
Make-A-Book Day has always been observed annually on the Thursday of National Family Reading Week.
National Children’s Mental Health Awareness Day has always been observed annually on Thursday of the first full week of May.
Fintastic Friday: Giving Sharks a Voice has always been observed annually on the second Friday of May.
Military Spouse Appreciation Day also known as Military Spouses Day. Observed the Friday before Mother’s Day.
National Public Gardens Day has always been observed annually on the Friday before Mother’s Day.
Provider Appreciation Day also known as Child Care Provider Appreciation Day. Observed the Friday before Mother’s Day.
American Indian Day also known as Native American Day. Observed the second Saturday of May.
Birthmother’s Day Observed the day before Mother’s Day.
Brunch for Lunch Day Observed the day before Mother’s Day.
Cornelia de Lange Syndrome Awareness Day has always been observed annually on the second Saturday of May.
International Migratory Bird Day has always been observed annually on the second Saturday of May.
Letter Carrier’s Stamp Out Hunger Food Drive Day has always been observed annually on the second Saturday of May.
Mother Ocean Day has always been observed annually on the day before Mother’s Day.
National Babysitter’s Day has always been observed annually on Saturday of the first full week of May.
National Animal Disaster Preparedness Day has always been observed annually on the second Saturday of May.
National Miniature Golf Day has always been observed annually on the second Saturday of May.
National Train Day has always been observed annually on the second Saturday of May.
Stay Up All Night Night has always been observed annually on the second Saturday of May.
Sun Awareness Day has always been observed annually on the second Saturday of May.
World Belly Dance Day has always been observed annually on the second Saturday of May.
World Fair Trade Day has always been observed annually on the second Saturday of May.
Jerusalem Day also known as Yom Yerushalayim. Observed the 28th of Iyyar in the Hebrew calendar.
Mother’s Day has always been observed annually on the second Sunday of May.
Mothers at the Wall Day has always been observed annually on the second Sunday of May.
National Apple Pie Day observed annually on May 13th and annually on December 3rd.
National Veal Ban Action Day has always been observed annually on the second Sunday of May.
National Women’s Check-Up Day has always been observed annually on Monday of the second full week of May.
Dinosaur Day observed annually on May 15th and annually on June 1st.
Sex Differences in Health Awareness Day has always been observed annually on Tuesday of National Women’s Health Week.
National Employee Health and Fitness Day has always been observed annually on the third Wednesday of May.
Turn Beauty Inside Out Day has always been observed annually on the third Wednesday of May.
Brown Bag It Thursday has always been observed annually on the third Thursday of May.
Hummus Day has always been observed annually on the third Thursday of May.
National Apéritif Day has always been observed annually on the third Thursday of May.
National Notebook Day has always been observed annually on the third Thursday of May.
Endangered Species Day has always been observed annually on the third Friday of May.
NASCAR Day also known as National Association for Stock Car Auto Racing Day. Observed the third Friday of May.
International Virtual Assistants Day has always been observed annually on the third Friday of May.
National Bike to Work Day has always been observed annually on the third Friday of May.
National Defense Transportation Day has always been observed annually on the third Friday of May.
O. Henry Pun-off Day has always been observed annually on the third Friday of May.
National Pizza Party Day has always been observed annually on the third Friday of May.
Armed Forces Day has always been observed annually on the third Saturday of May.
Culture Freedom Day has always been observed annually on the third Saturday of May.
National River Cleanup Day has always been observed annually on the third Saturday of May.
National Learn to Swim Day has always been observed annually on the third Saturday of May.
World Whisky Day has always been observed annually on the third Saturday of May.
Preakness Stakes has always been observed annually on the third Saturday of May.
Pentecost observed 49 days after Easter.
Shavuot also known as Feast of Weeks and Festival of Weeks. Observed the 6th of Sivan in the Hebrew calendar.
World Baking Day has always been observed annually on the third Sunday of May.
Stepmother’s Day has always been observed annually on the Sunday after Mother’s Day.
National Waiters and Waitresses Day also known as Waitstaff Day. It has always been observed annually on May 21st.
Emergency Medical Services for Children Day has always been observed annually on Wednesday of the third full week of May.
Aviation Maintenance Technician Day also known as AMT Day. It has always been observed annually on May 24th.
Don’t Fry Day also known as National Heat Awareness Safety Day. Observed the Friday before Memorial Day.
European Neighbours’ Day has always been observed annually on the last Friday of May.
National Death Busters Day has always been observed annually on the Friday before Memorial Day.
National Heat Awareness Day has always been observed annually on the last Friday of May.
National Wig Out Day Observed 10 days before the first Monday of June.
National Title Track Day also known as National Title Track Appreciation Day. Observed the fourth Friday of May.
Amateur Radio Military Appreciation Day also known as ARMAD. Observed 9 days before the first Monday of June.
Julia Pierpont Day has always been observed annually on the Saturday before Memorial Day.
Indianapolis 500 has always been observed annually on the Sunday of Memorial Day weekend.
Neighbor Day Observed 8 days before the first Monday of June.
Trinity Sunday Observed 56 days after Easter.
Memorial Day also known as Decoration Day. Observed the last Monday of May.
International Coq Au Vin Day also known as International Rooster with Wine Day. It has always been observed annually on May 29
National Senior Health and Fitness Day has always been observed annually on the last Wednesday of May.
World MS Day also known as World Multiple Sclerosis Day. Observed the last Wednesday of May.
Corpus Christi Observed 60 days after Easter.
Couple Appreciation Day has always been observed annually on May 1.
CSS Reboot Day has always been observed annually on May 1.
Executive Coaching Day has always been observed annually on May 1.
International Workers’ Day has always been observed annually on May 1.
Global Love Day has always been observed annually on May 1.
The Start of International Drum Month has always been observed annually on May 1.
Frequent Flyer Day has always been observed annually on May 1.
Lei Day has always been observed annually on May 1.
Law Day has always been observed annually on May 1.
Loyalty Day has always been observed annually on May 1.
Keep Kids Alive Drive 25 Day has always been observed annually on May 1.
National Chocolate Parfait Day has always been observed annually on May 1.
Mother Goose Day has always been observed annually on May 1.
May Day has always been observed annually on May 1.
Phone in Sick Day also known as Call in Sick Day. It has always been observed annually on May 1.
New Homeowners Day has always been observed annually on May 1.
National Purebred Dog Day has always been observed annually on May 1.
Silver Star Service Banner Day also known as Silver Star Day. It has always been observed annually on May 1.
Save the Rhino Day also known as Save the Rhinoceros Day. It has always been observed annually on May 1.
School Principals’ Day has always been observed annually on May 1.
Worthy Wage Day has always been observed annually on May 1.
The Start of Syringomyelia Awareness Month has always been observed annually on May 1.
Baby Day has always been observed annually on May 2.
Brothers and Sisters Day also known as Sibling Appreciation Day. It has always been observed annually on May 2.
International Scurvy Awareness Day has always been observed annually on May 2.
National Truffle Day has always been observed annually on May 2.
National Fire Day has always been observed annually on May 2.
National Play Your Ukulele Day has always been observed annually on May 2.
World Tuna Day has always been observed annually on May 2.
Take a Baby to Lunch Day has always been observed annually on May 2.
Garden Meditation Day has always been observed annually on May 3.
National Specially-abled Pets Day also known as Disabled Pets Day. It has always been observed annually on May 3.
National Lumpy Rug Day has always been observed annually on May 3.
National Raspberry Popover Day also known as National Raspberry Tart Day. It has always been observed annually on May 3.
National Two Different Colored Shoes Day has always been observed annually on May 3.
Public Radio Day has always been observed annually on May 3.
Paranormal Day has always been observed annually on May 3.
Wordsmith Day has always been observed annually on May 3.
Sun Day has always been observed annually on May 3.
World Press Freedom Day has always been observed annually on May 3.
Anti-Bullying Day has always been observed annually on May 4.
Bird Day has always been observed annually on May 4.
Intergalactic Star Wars Day has always been observed annually on May 4.
National Candied Orange Peel Day has always been observed annually on May 4.
International Firefighters Day has always been observed annually on May 4.
National Orange Juice Day has always been observed annually on May 4.
National Weather Observers Day has always been observed annually on May 4.
National Kids Fitness Day has always been observed annually on May 4.
Renewal Day also known as Relationship Renewal Day. It has always been observed annually on May 4.
Respect For Chickens Day has always been observed annually on May 4.
Petite and Proud Day has always been observed annually on May 4.
World Give Day has always been observed annually on May 4.
Cartoonists Day has always been observed annually on May 5.
Cinco de Mayo has always been observed annually on May 5.
International Midwives Day has always been observed annually on May 5.
Museum Lover’s Day has always been observed annually on May 5.
National Chocolate Custard Day has always been observed annually on May 5.
National Hoagie Day has always been observed annually on May 5.
Oyster Day has always been observed annually on May 5.
Revenge of the Fifth has always been observed annually on May 5.
Totally Chipotle Day has always been observed annually on May 5.
International No Diet Day has always been observed annually on May 6.
Joseph Brackett Day has always been observed annually on May 6.
National Beverage Day has always been observed annually on May 6.
National Crêpe Suzette Day has always been observed annually on May 6.
National Nurses Day has always been observed annually on May 6.
National Tourist Appreciation Day has always been observed annually on May 6.
National Barrier Awareness Day has always been observed annually on May 7.
National Cosmopolitan Day has always been observed annually on May 7.
National Roast Leg of Lamb Day has always been observed annually on May 7.
Paste Up Day has always been observed annually on May 7.
National Tourism Day has always been observed annually on May 7.
Free Trade Day has always been observed annually on May 8.
Iris Day has always been observed annually on May 8.
National Coconut Cream Pie Day has always been observed annually on May 8.
No Socks Day has always been observed annually on May 8.
National Have a Coke Day has always been observed annually on May 8.
National Student Nurses Day has always been observed annually on May 8.
Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War has always been observed annually on May 8.
Victory in Europe Day also known as V-E Day. It has always been observed annually on May 8.
World Ovarian Cancer Day has always been observed annually on May 8.
World Red Cross and Red Crescent Day has always been observed annually on May 8.
Hurray for Buttons Day has always been observed annually on May 9.
National Butterscotch Brownie Day has always been observed annually on May 9.
National Moscato Day has always been observed annually on May 9.
National Lost Sock Memorial Day has always been observed annually on May 9.
Tear the Tags Off the Mattress Day has always been observed annually on May 9.
National Clean Up Your Room Day has always been observed annually on May 10.
National Shrimp Day has always been observed annually on May 10.
National Small Business Day has always been observed annually on May 10.
Trust Your Intuition Day has always been observed annually on May 10.
World Lupus Day has always been observed annually on May 10.
Eat What You Want Day has always been observed annually on May 11.
Hostess Cupcake Day has always been observed annually on May 11.
National Twilight Zone Day has always been observed annually on May 11.
International Awareness Day has always been observed annually on May 12.
International Chronic Fatigue Syndrome Awareness Day also known as International Myalgic Encephalomyelitis Awareness Day. It has always been observed annually on May 12.
International Nurses’ Day has always been observed annually on May 12.
Limerick Day has always been observed annually on May 12.
National Fibromyalgia Awareness Day has always been observed annually on May 12.
Odometer Day has always been observed annually on May 12.
National Nutty Fudge Day has always been observed annually on May 12.
Cough Drop Day has always been observed annually on May 13.
Frog Jumping Day has always been observed annually on May 13.
International Hummus Day has always been observed annually on May 13.
National Fruit Cocktail Day has always been observed annually on May 13.
National Leprechaun Day has always been observed annually on May 13.
Top Gun Day has always been observed annually on May 13.
Tulip Day has always been observed annually on May 13.
World Cocktail Day has always been observed annually on May 13.
International Dylan Thomas Day also known as Dylan Day. It has always been observed annually on May 14.
National Buttermilk Biscuit Day has always been observed annually on May 14.
National Dance Like a Chicken Day also known as Chicken Dance Day. It has always been observed annually on May 14.
The Stars and Stripes Forever Day has always been observed annually on May 14.
National Underground America Day has always been observed annually on May 14.
HG Awareness Day also known as Hyperemesis Gravidarum Awareness Day. It has always been observed annually on May 15.
International Conscientious Objectors Day has always been observed annually on May 15.
International Day of Families has always been observed annually on May 15.
International MPS Awareness Day also known as International Mucopolysaccharidoses Awareness Day. It has always been observed annually on May 15.
National Safety Dose Day has always been observed annually on May 15.
National Tuberous Sclerosis Day has always been observed annually on May 15.
National Chocolate Chip Day has always been observed annually on May 15.
Peace Officers Memorial Day has always been observed annually on May 15.
Relive Your Past By Listening to the First Music You Ever Bought No Matter What It Was No Excuses Day has always been observed annually on May 15.
Nylon Stockings Day has always been observed annually on May 15.
Straw Hat Day has always been observed annually on May 15.
Biographer’s Day has always been observed annually on May 16.
Love a Tree Day has always been observed annually on May 16.
National Coquilles St. Jacques Day has always been observed annually on May 16.
National Mimosa Day has always been observed annually on May 16.
National Piercing Day has always been observed annually on May 16.
National Sea Monkey Day has always been observed annually on May 16.
National Wear Purple for Peace Day has always been observed annually on May 16.
International Day Against Homophobia, Biphobia and Transphobia has always been observed annually on May 17.
National Cherry Cobbler Day has always been observed annually on May 17.
National Mushroom Hunting Day has always been observed annually on May 17.
National Walnut Day has always been observed annually on May 17.
National Pack Rat Day has always been observed annually on May 17.
World Hypertension Day has always been observed annually on May 17.
World Neurofibromatosis Awareness Day also known as World NF Awareness Day. It has always been observed annually on May 17.
World Telecommunication and Information Society Day has always been observed annually on May 17.
HIV Vaccine Awareness Day has always been observed annually on May 18.
I Love Reese’s Day has always been observed annually on May 18.
International Museum Day has always been observed annually on May 18.
Mother Whistler Day has always been observed annually on May 18.
National Cheese Soufflé Day has always been observed annually on May 18.
National No Dirty Dishes Day has always been observed annually on May 18.
National Visit Your Relatives Day has always been observed annually on May 18.
Send an Electronic Greeting Card Day has always been observed annually on May 18.
World AIDS Vaccine Day has always been observed annually on May 18.
Boy’s Club Day has always been observed annually on May 19.
Celebrate Your Elected Officials Day has always been observed annually on May 19.
May Ray Day has always been observed annually on May 19.
National Asian and Pacific Islander HIV/AIDS Awareness Day also known as National API HIV/AIDS Awareness Day. It has always been observed annually on May 19.
National Devil’s Food Cake Day has always been observed annually on May 19.
National Hepatitis Testing Day has always been observed annually on May 19.
National Frog Jumping Jubilee Day has always been observed annually on May 19.
World IBD Day also known as World Inflammatory Bowel Diseases Day. It has always been observed annually on May 19.
Be a Millionaire Day has always been observed annually on May 20.
Eliza Doolittle Day has always been observed annually on May 20.
Flower Day has always been observed annually on May 20.
Pick Strawberries Day has always been observed annually on May 20.
National Quiche Lorraine Day has always been observed annually on May 20.
Weights and Measures Day has always been observed annually on May 20.
World Autoimmune Arthritis Day has always been observed annually on May 20.
American Red Cross Founder’s Day has always been observed annually on May 21.
I Need a Patch for That Day has always been observed annually on May 21.
National Memo Day has always been observed annually on May 21.
National Strawberries and Cream Day has always been observed annually on May 21.
Rapture Party Day has always been observed annually on May 21.
Sister Maria Hummel Day has always been observed annually on May 21.
World Day for Cultural Diversity for Dialogue and Development has always been observed annually on May 21.
Canadian Immigrants Day has always been observed annually on May 22.
Harvey Milk Day has always been observed annually on May 22.
International Day for Biological Diversity has always been observed annually on May 22.
National Vanilla Pudding Day has always been observed annually on May 22.
National Maritime Day has always been observed annually on May 22.
National Buy a Musical Instrument Day has always been observed annually on May 22.
Sherlock Holmes Day has always been observed annually on May 22.
World Goth Day has always been observed annually on May 22.
Declaration of the Bab Day has always been observed annually on May 23.
International Day to End Obstetric Fistula has always been observed annually on May 23.
National Taffy Day has always been observed annually on May 23.
Lucky Penny Day has always been observed annually on May 23.
World Crohn’s and Colitis Day has always been observed annually on May 23.
World Turtle Day has always been observed annually on May 23.
Asparagus Day has always been observed annually on May 24.
Brother’s Day has always been observed annually on May 24.
International Tiara Day has always been observed annually on May 24.
Scavenger Hunt Day has always been observed annually on May 24.
National Escargot Day has always been observed annually on May 24.
Geek Pride Day also known as Nerd Pride Day. It has always been observed annually on May 25.
National Brown-Bag-It Day has always been observed annually on May 25.
National Missing Children’s Day has always been observed annually on May 25.
National Tap Dance Day has always been observed annually on May 25.
Towel Day has always been observed annually on May 25.
National Wine Day has always been observed annually on May 25.
International Jazz Day Observed 9 days before the first Monday of June. May 26.
National Blueberry Cheesecake Day has always been observed annually on May 26.
National Paper Airplane Day has always been observed annually on May 26.
National Cherry Dessert Day has always been observed annually on May 26.
National Grey Day has always been observed annually on May 26.
World Redhead Day has always been observed annually on May 26.
Sally Ride Day has always been observed annually on May 26.
World Lindy Hop Day has always been observed annually on May 26.
World Dracula Day has always been observed annually on May 26.
Cellophane Tape Day has always been observed annually on May 27.
National Grape Popsicle Day has always been observed annually on May 27.
Nothing To Fear Day has always been observed annually on May 27.
Old-Time Player Piano Day has always been observed annually on May 27.
Sunscreen Protection Day has always been observed annually on May 27.
Amnesty International Day has always been observed annually on May 28.
International Hamburger Day has always been observed annually on May 28.
Slugs Return From Capistrano Day has always been observed annually on May 28.
National Brisket Day has always been observed annually on May 28.
Ascension of Bahá’u’lláh has always been observed annually on May 29.
End of the Middle Ages Day has always been observed annually on May 29.
International Day of United Nations Peacekeepers has always been observed annually on May 29.
Learn About Composting Day has always been observed annually on May 29.
Paper Clip Day has always been observed annually on May 29.
National Biscuit Day has always been observed annually on May 29.
World Digestive Health Day has always been observed annually on May 29.
Put a Pillow on Your Fridge Day has always been observed annually on May 29.
Loomis Day has always been observed annually on May 30.
My Bucket’s Got A Hole In It Day has always been observed annually on May 30.
Water a Flower Day has always been observed annually on May 30.
National Mint Julep Day has always been observed annually on May 30.
National Macaroon Day has always been observed annually on May 31.
National Meditation Day has always been observed annually on May 31.
Save Your Hearing Day has always been observed annually on May 31.
Necrotizing Fasciitis Awareness Day has always been observed annually on May 31.
Speak in Complete Sentences Day has always been observed annually on May 31.
What You Think Upon Grows Day has always been observed annually on May 31.
World No Tobacco Day has always been observed annually on May 31.
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