Which Colorado cities have the most Ultra races?
Fairplay (1), Westcliffe (1), Larkspur (1), Divide (1) lead the state for Ultra races. Those give you the most dates to choose from if your schedule is tight.
Colorado · Ultra
Ultra Races in Colorado
Every upcoming Ultra in Colorado, all 5 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
5 upcoming Ultra races · 2 with finish-time stats
By the numbers
The Biggest and Longest-Running
The Colorado races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
Ultra Races by City
Soonest Ultra Races in Colorado
5 total Sat, Aug 1, 2026Sheep Mountain Trail Runs Fairplay, COFrom $100Details Sat, Sep 26, 2026Sangre de Cristo Trail Festival Westcliffe, COFrom $70Details Sat, May 1, 2027Greenland Trail Races Larkspur, COFrom $35Details Sat, May 15, 2027Endure Trail Runs Divide, COFrom $60Details Sat, Jun 5, 2027Weld Your Mettle Running Festival Eaton, COFrom $35Details
How we calculate these stats: RunSesh calculates these figures from the most recent published results of past editions, sourced from RunSignup. We show aggregates only: field size, winning and median times, and the cutoff. We never publish individual finisher tables. Last updated Jul 27, 2026.
Common Questions About Running an Ultra in Colorado
When are most Ultra races held in Colorado?
May is the busiest month for Ultra races in Colorado, with 2 of the 5. If you are flexible on the date, that is the quickest way to narrow things down.
How much do Colorado Ultra races cost?
Entry fees for Ultra races here run from $35 to about $100, depending on the event and how early you register.
How early should I register for an Ultra in Colorado?
3 of the 5 Ultra races in Colorado already have a price increase scheduled, so entry gets more expensive the longer you leave it. Race pricing almost always steps up as the date approaches, and signing up early is usually the cheapest option.
Are there trail Ultra races in Colorado?
Yes, 5 races around Colorado get you off the pavement: 5 are trail races. Surfaces are not always published, so it is worth checking a specific race before you register.