Ultramarathons in Colorado
11 upcoming ultramarathons in Colorado, USA.
9 cities
Busiest: December
From €111
Upcoming races
Your guide to ultramarathons in Colorado, USA
There are 11 upcoming ultramarathons in Colorado, USA, spread across 9 cities. Filter by distance or terrain to narrow things down, and save the races you like the look of.
Most take place in December, November and March. Next up is 6th Kessel Run - 50mi in Fruita on 7 November 2026.
Questions runners ask
How many ultramarathons in Colorado, USA are there?
Finndu lists 11 upcoming ultramarathons in Colorado, USA, across 9 towns and cities. The list is updated twice a day as organisers announce new races.
When is the next one?
6th Kessel Run in Fruita, on 7 November 2026.
Which month has the most ultramarathons in Colorado, USA?
December, followed by November and March.
How much does it cost to enter?
Entry starts from US$128. Fees vary from race to race, so check each race page for its current price.