Yellow Pig Day

white and gray bird on the bag of brown and black pig swimming on the beach during daytime

Yellow Pig Day

Have you ever heard of Yellow Pig Day? If not, get ready to learn all about this quirky and fun holiday celebrated on July 17 each year. From its origins to interesting facts, Yellow Pig Day is a unique celebration that is sure to bring a smile to your face.

What is Yellow Pig Day?

Yellow Pig Day is a whimsical holiday that pays tribute to the number 17 and the color yellow. It is believed to have originated in the early 1960s when two mathematicians, Michael Spivak and David C. Kelly, created the concept of the Yellow Pig. The number 17 and the color yellow were chosen as random elements to create a playful and lighthearted holiday.

History of Yellow Pig Day

The story goes that Michael Spivak and David C. Kelly were students at Princeton University who became fascinated with the number 17 for its unique properties and mathematical significance. They decided to create a fictional character, the Yellow Pig, to represent this number and bring some fun and creativity to their studies.

The Yellow Pig was described as a friendly and intelligent creature with 17 toes, 17 teeth, and a love for the number 17. Over time, the concept of Yellow Pig Day evolved, and it became a day for people to embrace their inner geekiness, celebrate math and creativity, and have fun with the color yellow.

Interesting Facts About Yellow Pig Day

  • Yellow Pig Symbolism: The Yellow Pig is often associated with good luck and positivity. Some people believe that seeing a Yellow Pig on Yellow Pig Day brings good fortune for the rest of the year.

  • Celebrations: Yellow Pig Day is celebrated in various ways, including wearing yellow clothing, baking yellow-themed treats, and hosting Yellow Pig-themed parties. Some people even exchange Yellow Pig-themed gifts to mark the occasion.

  • Mathematical Significance: The number 17 has some interesting mathematical properties, such as being a prime number and the sum of the first four prime numbers (2 + 3 + 5 + 7 = 17). Math enthusiasts often use Yellow Pig Day as an opportunity to explore the fascinating world of numbers and patterns.

  • Community Spirit: Yellow Pig Day has gained a small but dedicated following among mathematicians, educators, and fans of quirky holidays. It has become a way for people to come together and celebrate their love of math and creativity in a fun and inclusive way.

How to Celebrate Yellow Pig Day

Looking to join in the fun and celebrate Yellow Pig Day this July 17? Here are some ideas to get you started:

  • Wear Yellow: Show your support for the Yellow Pig by wearing yellow clothing or accessories.

  • Get Creative: Try your hand at creating Yellow Pig-themed artwork, crafts, or decorations.

  • Host a Yellow Pig Party: Invite friends and family to a Yellow Pig Day party complete with yellow decorations, food, and games.

  • Share the Joy: Spread the word about Yellow Pig Day on social media using the hashtag #YellowPigDay and encourage others to join in the celebration.


Yellow Pig Day is a delightful holiday that brings together math, creativity, and a sense of whimsy. Whether you’re a math enthusiast, a lover of all things yellow, or simply looking for a reason to celebrate, Yellow Pig Day offers a unique and fun-filled experience for everyone. So mark your calendars for July 17 and get ready to embrace the magic of the Yellow Pig!

Happy Yellow Pig Day! 🐷💛

egg and flowers on windowsill at home
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