Have an event to List?
Whether a race, special group ride, training opportunity, or cycling-related community event, the 303 calendar showcases it all. To have an event posted here please follow this link: Event Policy Submission & Guidelines.
Arvada The Ralston Creek Half Marathon and 5K returns in 2019, after sold out fields in the half for the past 7 years! Join us at Colorado's Premier Winter Half Marathon, and the finale to the 2018-2019 Racing Underground winter running series. The Ralston Creek races feature a fun winter half-marathon and 5K run conveniently located on the west side of the Denver Metro Area in Arvada, Colorado. The courses covers a scenic mix of road and bike path…Find out more »
Aurora Denver's low key, low cost multisport winter series!!! The Chilly Cheeks Winter Duathlon series is composed of three run-bike events at the Cherry Creek Reservoir. We provide a marked and marshaled course, fast & accurate chip timing, light refreshments, and some fun mid-winter competition in the heart of Denver. Enter one race, or all-three - it's up to you. Register for all three duathlons by December 7th and get a pair of Chilly Cheeks Sweat Pants - perfect for pulling…Find out more »
Morrison This 5k/10k run is brought to you by Racing Underground. Conveniently located on the scenic west side of metro Denver, Bear Creek Lake Park is known for it's diverse bird and waterfowl population as well as stunning views of the foothills. The 5k and 10k races wander it's 2500 acres with a mostly flat 5K course, while the 10k throws in a few rolling hills. The race has sold out weeks before race day every year, and offers…Find out more »