Sourest Day

Celebrated on 10/25/2026

Quick Fact

Sourest Day, celebrated on October 25, was created in 2018 by a group of candy enthusiasts who wanted to honor the puckering power of sour treats. The holiday has gained popularity, with sour candy sales increasing by over 20% in the week leading up to it. Some extreme sour candies, like Toxic Waste, have a pH level as low as 1.8, rivaling battery acid.

Origins and Establishment of Sourest Day

Sourest Day was first celebrated on October 25, 2018, after being conceived by a small group of sour candy aficionados from the United States. The founders, who were active in online candy forums, wanted to create a day dedicated to the unique taste sensation and cultural phenomenon of sour confections. They chose late October to coincide with the post-Halloween candy season, when many stores offer discounts on sour treats. The holiday was officially registered on NationalDayCalendar.com, and the founders promoted it through social media and candy blogs.

Evolution and Modern Commemoration

Since its inception, Sourest Day has grown from a niche internet celebration to a recognized occasion in candy-loving communities. In 2020, several major candy brands began marketing special sour editions and limited-time flavors for the day. Today, enthusiasts commemorate Sourest Day by hosting sour candy tasting parties, challenging friends to eat the sourest candies, and sharing videos of their reactions online. Schools and workplaces sometimes organize "sour snack swaps," and candy shops offer discounts on sour products. The holiday has also inspired charity events where participants donate sour candies to local food banks.

Facts & General Observations

The global sour candy market was valued at approximately $3.5 billion in 2023, with an expected annual growth rate of 5.2% through 2030. The sourest commercially available candy, as measured by pH level, is the "Cry Baby" tear-inducing lollipop, which has a pH of around 1.6. * A 2022 survey found that 68% of Americans have tried a sour candy, and among those, 42% reported enjoying the sensation of extreme sourness.

Explore more celebrations, trivia, and quests on National Day Quest.