Yellow Pig Day

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When Celebrated

Always on July 17th


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About the Holiday

Yellow Pig Day, held annually on July 17th, is a humorous celebration created and observed by mathematicians at Hampshire College in Amherst, Massachusetts. Yellow Pigs Day was started by Michael Spivak and David C. Kelly who were listing the interesting properties of the number 17 (hence the 7/17 for the holiday's date, where 17 is the 7th prime number) and somehow a 17 eyelashed yellow pig was born.[1]

The day is typically marked by exchanging gifts relating to yellow pigs, mathematics, the number 17, singing yellow pig songs, and playing Ultimate. Some celebrations for this day occur on May 17th and September 17th.

Gift Guidelines

  • Yellow pig figurines or stuffed animals
  • Anything with the number 17
  • A game of Ultimate

Related Holidays


  1. Wikipedia:Yellow Pigs Day

July Info & More Holidays

Birthstone: Birthstoneruby.jpg
Flower: Larkspur.jpg
Jun 22 - Jul 22


Jul 23 - Aug 22