Marathons in Colorado, United States
56 upcoming races are listed in Colorado, including 24 marathons, 41 half marathons and 17 ultras. The next is Center of the Nation - CO on September 29, 2026.
October has the most races. Race pages link the official source where we have one. Confirm dates and prices with the organizer before you register.
56
Races listed
24
Marathons
October
Busiest month
25 May
Last updated
| Date | Race | City | Distances |
|---|---|---|---|
| 1 Nov 2026 01Nov 26 | Rim Rock Marathon | Fruita | Ultra · 42.2K · 21.1K |
| 7 Nov 2026 07Nov 26 | Colorado 24 Hour Run | Fort Collins | 24 Hour · 12 Hour · 6 Hour |
| 7 Nov 2026 07Nov 26 | HRCA Backcountry Wilderness Half Marathon | Lone Tree | 21.1K |
| 7 Nov 2026 07Nov 26 | Kessel Run Ultra | Fruita | 50 Miler · 40 Miler · 50K |
| 7 Nov 2026 07Nov 26 | Turkey Trails- Denver | Littleton | 21.1K · 10K · 5K |
| 8 Nov 2026 08Nov 26 | Turkey Trails - Colorado Springs | Colorado Springs | 21.1K · 10K · 5K |
| 9 Nov 2026 09Nov 26 | Southwest Series - Day 2 (CO) | Colorado | 42.2K · 21.1K |
| 9 Nov 2026 09Nov 26 | Southwest Series - CO | Durango | 42.2K · 21.1K |
| 14 Nov 2026 14Nov 26 | Louisville Trail Race | Louisville | 21.1K · 10K · 5K |
| 14 Nov 2026 14Nov 26 | Run for Mental Health 5K/10K/13.1 DENVER/AURORA | Centennial | 42.2K · 21.1K · 10K |
| 21 Nov 2026 21Nov 26 | TURKEY TREK (13.1, 10k, 5k & 2k) | Arvada | 21.1K · 10K · 5K |
| 28 Nov 2026 28Nov 26 | Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA | Centennial | 42.2K · 21.1K · 10K |
| 5 Dec 2026 05Dec 26 | All-Out Fa La La | Westminster | 21.1K · 10K · 5K |
| 5 Dec 2026 05Dec 26 | Four Corners Quad Keyah Marathon - Day 3 | Durango | 42.2K · 21.1K |
| 5 Dec 2026 05Dec 26 | Sawmill Trail Runs | Pine | 50K · 16.14 Miler · 8.08 Miler |
| 6 Dec 2026 06Dec 26 | Rock Canyon Half Marathon- 40th Anniversary Run! | Pueblo | 21.1K · 5K |
| 12 Dec 2026 12Dec 26 | Sunrise Marathon 5K/10K/13.1 DENVER/AURORA | Centennial | 42.2K · 21.1K · 10K |
| 26 Dec 2026 26Dec 26 | New Year's Run 5K/10K/13.1 DENVER/AURORA | Centennial | 42.2K · 21.1K · 10K |
| 9 Jan 2027 09Jan 27 | All-Out Polar Prowl | Arvada | 21.1K · 10K · 5K |
| 6 Feb 2027 06Feb 27 | All-Out Mardi Crawl | Arvada | 21.1K · 10K · 5K |
| 6 Feb 2027 06Feb 27 | Stories Trail Runs | Colorado Springs | 19.6 Miler · 21.1K · 6.7 Miler |
| 13 Mar 2027 13Mar 27 | 22nd Annual Run Through Time Trail Marathon and Half Marathon | Salida | 42.2K · 21.1K · 2 Miler |
| 21 Mar 2027 21Mar 27 | All-Out Spring Fever | Golden | 21.1K · 10K · 5K |
| 9 Apr 2027 09Apr 27 | Trail Running Festival Desert Rats by UTMB® | Colorado | 100K · 50K · 21.1K |
Go a level deeper
Links go down the map, not sideways. Each region and city has its own page of races.
Cities
Common questions
When is the next race in Colorado?
Center of the Nation - CO on September 29, 2026. The table above lists every upcoming race in date order.
Which months are busiest in Colorado?
October (21), November (13), December (6), counting every upcoming race listed in Colorado.
Which distances can I run in Colorado?
The listed races include 24 marathons, 41 half marathons, 17 ultras, 25 10Ks and 30 5Ks. Many events offer more than one distance on the same day.
How do I confirm a race’s details?
Open the race page and check its provenance ledger, which shows where each fact came from. Then confirm the date, price and entry rules with the organizer before you register or book travel.
Spotted something wrong on this page?
Dates and prices move · tell us and we check the organizer’s source