Unsanctioned races in Denver
Colorado, USA
Upcoming
No race in Denver has a confirmed date listed yet. The notable races below are the ones to watch for an announcement.
The scene
Denver’s best-known unsanctioned race is on foot: the Taco Bell 50K, a free 31-mile run between ten Taco Bells that drew more than 700 runners in 2025. On the bike, Tuesday Night Thunder runs a self-categorized weeknight criterium in Louisville from June, the Colorado Trail Race sends self-supported riders between the Waterton Canyon trailhead and Durango with no entry fee, and Treehouse Cyclery has held Cranksgiving food-drive alleycats in Denver and Boulder. Dates mostly surface in local press and on the Bicycle Colorado event calendar.
Notable races
- RunningWebsite ↗
Taco Bell 50K
A free 31-mile run linking ten Denver Taco Bells from the South Broadway location, where runners must eat at nine of the stops, keep the receipts and finish inside an 11-hour cutoff.
- CyclingWebsite ↗
Colorado Trail Race
A free, self-supported mountain bike race over the roughly 500-mile Colorado Trail between Denver and Durango, with no entry fee, registration or prize money.
- CyclingWebsite ↗
TNT Tuesday Night Thunder
A weeknight criterium series in Louisville on a 0.6-mile course with three wide 90-degree turns, raced in self-selected categories with no sanctioning body.
- CyclingWebsite ↗
Treehouse Cranksgiving Alleycat
A food-drive alleycat in which riders buy Thanksgiving groceries along the course and race for prizes, held from Treehouse Cyclery’s Denver shop in 2024 and its Boulder shop in 2025.
Recently run on ALLEYKAT
Running[00]
No running race in Denver has run on ALLEYKAT yet.
Cycling[00]
No cycling race in Denver has run on ALLEYKAT yet.
How races get in here
The directory is curated by ALLEYKAT. Races timed on the app appear in their city on their own once they have a date or have been run, and everything else is added by hand after we have checked it against the organiser’s own page. There is no form and no fee.