Race calendar · October 2026 · Colorado

October 2026 Marathon Races in Colorado

Every Marathon in Colorado in October 2026, all 5 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.

5 Marathon races in October 2026

5K in October10K in OctoberHalf Marathon in OctoberUltra in October

When in October

The October Race Weekends

Marathon races do not spread evenly across October. The busiest weekend is October 10 and October 11, with 3 of them.

  1. Oct 3 – Oct 42
  2. Oct 10 – Oct 113

By the numbers

The Biggest and Longest-Running

The October Marathon races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.

Largest field313 finishersThe Long View Marathonin the Half Marathon

October Marathon Races by City

Breckenridge 1Colorado Springs 1Durango 1Fort Collins 1Windsor 1
Open map ↗

Soonest Marathon Races in October

5 total
Sat, Oct 3, 2026Colorado Springs Marathon, Half, 5K, and Kids K Colorado Springs, COMarathonHalf Marathon5K1KFrom $30Details Sun, Oct 4, 2026Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run Windsor, COMarathonHalf Marathon10K5KFrom $20Details Sat, Oct 10, 2026The Long View Marathon Fort Collins, COMarathonHalf Marathon5KFrom $45Details Sat, Oct 10, 2026Breckenridge RunFest Breckenridge, COMarathonHalf Marathon10K5KFrom $30Details Sun, Oct 11, 2026Durango Marathon Durango, COMarathonHalf MarathonFrom $40Details

Common Questions About Running an October Marathon in Colorado

When in October are most Marathon races held?

The busiest weekend in Colorado is October 10 and October 11, with 3 Marathon races on those two days, and the single busiest day is Saturday, October 10 with 2. Every one of them is on a Saturday or a Sunday.

When should I sign up for an October Marathon?

As early as you can. 2 of these October Marathon races already have a price increase on the calendar, and 5 are open for entry right now.

How much does an October Marathon cost to enter?

The typical entry is $30, with paid entries running from $20 up to $45. Entry fees climb as race day gets closer, so the same race is usually cheapest the week it opens.

Are there trail Marathon races in Colorado in October?

Yes, one race around Colorado gets you off the pavement: 1 mixes road and trail. Surfaces are not always published, so it is worth checking a specific race before you register.

Marathon Races in Other Months

September and November sit either side of October, which is where most people look next when a date does not fit.

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