The Twilight Series is a weekend of bicycle races and events that takes place every Spring in Athens, Georgia, United States since 1980. During the course of each Twilight weekend, competitive events in a variety of fields are staged, including BMX racing and trick contests, a Kids' Criterium, a mountain bike or 'Fat Tire' Criterium, and the climactic event of the weekend, the Twilight Criterium. The weekend event features amateur and professional races, with differing prizes for each.
The Twilight Criterium itself is the most publicized and highly anticipated of each Twilight weekend. It is a professional race that takes place on a 1km (.621 mile) course in downtown Athens. The entire race requires cyclists to endure 80km (49.71 miles) within just a few hours. The main criterium features cash prizes totaling more than $US10,000 .