The winning worm is announced as official forecaster, and its owner wins a monetary prize. Each heat consists of 20 worms and races continue all day until the grand final at about 4:00 p.m. People are allowed to 'holler' and whistle to encourage their worm to race. During each heat worms must race 42 inches up a vertical string attached to cardboard on the backboard of a flatbed trailer. About 1200 worms are entered to compete, in at least 50 heats. With the help of the festival's mascot Merriweather, he's responsible for ensuring festival rules are rigorously kept, in particular in regard to the caterpillar race. Presiding over the yearly festival is a Master of Ceremonies.

It's been featured in the world famous Farmers' Almanac and the Kiwanis International Magazine. The festivalĮach year attendance at this mountain celebration averages 15,000-20-000 people. Although not everyone recognizes the woolly worm as an accredited weather forecaster, the worm is held in esteem by festival celebrants because of its proclaimed 80-85 percent accuracy rate in predictions.

It's accepted by organizers of the North Carolina woolly worm festival that the color of the worm's thirteen body segments or stripes can be read and interpreted as a forecaster of the severity of coming winter. This caterpillar seeks safety from bitter winter weather by sheltering under logs, boulders, boards, rocks, and other dark places until emerging from its 'frozen' state in May.

Prior to settling in for winter, the woolly worm eats a variety of plants and then produces a kind of antifreeze which protects the creature from temperatures as low as -90 degrees Fahrenheit.

The Isabella tiger moth belongs to the Arctiidae family which has 11,000 species around the world.

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