- Number of holidays
- 19
- Day of the year
- 21
- Days left in the year
- 344
Squirrel Appreciation Day was established in 2001 by Christy Hargrove to celebrate the squirrel — the scatter-hoarding rodent that forgets approximately 74 percent of its buried acorns, inadvertently planting trees wherever it fails to retrieve them. International Sweatpants Day celebrates the elastic-waistbanded fleece trousers that pandemic living normalized — the comfort garment athleisure culture has elevated from gym wear to office-adjacent. Grandma Day was established to celebrate grandmothers and the multigenerational bond — research consistently links close grandmother relationships to lower anxiety and stronger emotional resilience in grandchildren. Get to Know Your Customers Day shifts to the third Thursday of January in 2027, encouraging businesses to deepen their understanding of the people who buy from them.
All Holidays On January 21
National Personalized Learning Day
Squirrel Appreciation Day
Grandma Day
Mariachi Day
National Bakers-Crafters-Makers Day
National Conscious Uncoupling Day
National Granola Bar Day
National Hug Your Puppy Day
National Hugging Day
One-Liners Day
Our Lady of Altagracia
Own Your Own Home Day
Thank Your Mentor Day
Women’s Healthy Weight Day
About January 21
January 21 Q&As
What is the most popular holiday on January 21?
On January 21, Squirrel Appreciation Day is the most widely recognized animal observance. International Sweatpants Day is the most widely recognized fashion observance, and Grandma Day is the most recognized family observance.
What animal holidays are on January 21?
January 21 includes Squirrel Appreciation Day, established in 2001 to celebrate the scatter-hoarding rodent that inadvertently plants trees by forgetting 74 percent of its buried acorns.
What countries celebrate holidays on January 21?
January 21 observances span the U.S., which hosts Squirrel Appreciation Day, International Sweatpants Day, Grandma Day, Get to Know Your Customers Day, and National Cheesy Socks Day. International Playdate Day is observed globally.