Fri, Sep 25, 2026 · 6:00 AM · Red Feather Lakes, CO
Red Feather Trail Jamboree
Half MarathonUltra4,200 ft gain
- Price
- $117.60-$358
- Field size
- 200 · based on the organizer's entry cap
Running races in Colorado
Upcoming running races in Colorado. We show what's actually known about each one and mark the rest as unknown.
Race results
Showing 59+ of 260 races · loading the full list…
Sat, Sep 26, 2026 · 7:00 AM · Buena Vista, CO
West Line Winder
30KUltra4,000 ft gain
- Price
- $154.70-$202.40
- Field size
- 500 · based on the organizer's entry cap
Sat, Sep 26, 2026 · 8:00 AM · Telluride, CO
Mountains to the Desert Classic
Ultra
- Price
- Price on registration site
Sat, Sep 26, 2026 · 8:30 AM · Fruita, CO
Mesa County Search & Rescue 5K
5K
- Price
- $38.10
- Field size
- 250 · based on the organizer's entry cap
Sat, Sep 26, 2026 · 10:00 AM · Pagosa Springs, CO
Pagosa Mountain Chile Cha Cha Trail Races
5K10K
- Price
- $32.80
Sat, Sep 26, 2026 · 7:30 AM · Centennial, CO
Oktoberfest Run 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$54
Sat, Sep 26, 2026 · 7:30 AM · Centennial, CO
Run for Donuts 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$54
Sat, Sep 26, 2026 · 8:00 AM · Colorado Springs, CO
OUTLAST COLORADO SPRINGS
18M
- Price
- $107
- Field size
- 150 · based on the organizer's entry cap
Sat, Sep 26, 2026 · 9:00 AM · Durango, CO
Mountain Marmot Trail Run presented by Durango Running Company
12M
- Price
- $99.58
- Field size
- 250 · based on the organizer's entry cap
Sat, Sep 26, 2026 · 8:05 AM · Parker, CO
Parker Parks and Recreation So Long to Summer 5K/10K
5K10K
- Price
- $48.95-$59.55
- Field size
- 700 · based on the organizer's entry cap
Sat, Sep 26, 2026 · 8:00 AM · Westcliffe, CO
Sangre de Cristo Trail Festival
8M27KUltra
- Price
- $75.20-$394.75
Sun, Sep 27, 2026 · 7:30 AM · Nathrop, CO
Sawatch Ascent
Ultra
- Price
- $191.80
- Field size
- 300 · based on the organizer's entry cap
Sun, Sep 27, 2026 · 10:00 AM · Larkspur, CO
Greenland Open Space Pack Burro Race presented by Double Rainbow Ranch (8 Mile and 3 Mile)
3M8M
- Price
- $64.60
- Field size
- 85 · based on the organizer's entry cap
Sun, Sep 27, 2026 · 9:00 AM · Arvada, CO
WWE ANNUAL RUN WITH THE WOLVES
1K5KCertified course · per organizer
- Price
- $44
Sun, Sep 27, 2026 · 7:00 AM · Boulder, CO
Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado
5K10KHalf Marathon
- Price
- $526
Sun, Sep 27, 2026 · 6:30 AM · Boulder, CO
Girls on the Run Rockies Boulderthon SoleMates 2026
10KHalf MarathonMarathon
- Price
- $27.50
- Field size
- 15 · based on the organizer's entry cap
Sun, Sep 27, 2026 · 3:00 PM · La Junta, CO
Healthy Kids Running Series Fall 2026 - La Junta, CO
1M
- Price
- $6.30
Sun, Sep 27, 2026 · 10:30 AM · Cenennial, CO
Colorado Coyotes Youth XC Invitational
2K3K4Krolling hills
- Price
- $28.80
Sat, Oct 3, 2026 · 8:00 AM · Littleton, CO
HRCA Wildcat Mountain Trail Races
10K10Mrolling hills
- Price
- $10-$70
Sat, Oct 3, 2026 · 8:30 AM · Canon City, CO
Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half Marathon
5K10K8MHalf Marathon
- Price
- Free-$96.40
- Field size
- 623 · based on the organizer's entry cap
Sat, Oct 3, 2026 · 8:00 AM · Fort Collins, CO
Homecoming 5K at Colorado State University
5K
- Price
- $28.38-$50.74
Sat, Oct 3, 2026 · 8:00 AM · Littleton, CO
Spooky Sprint - Denver
1M5K10KHalf Marathon
- Price
- Free-$87.72
Sat, Oct 3, 2026 · 8:00 AM · Littleton, CO
OUTLAST DENVER
18M
- Price
- $107
- Field size
- 200 · based on the organizer's entry cap
Sat, Oct 3, 2026 · 4:00 PM · Denver, CO
Rainbow Trail Lutheran Camp's 20th Annual Grace Race 5k
5K
- Price
- $40
Sat, Oct 3, 2026 · 9:00 AM · Steamboat Springs, CO
Emerald Mountain Trail Run
4M12K
- Price
- $33.60-$49.50
- Field size
- 300 · based on the organizer's entry cap
Sat, Oct 3, 2026 · 7:00 AM · Colorado Springs, CO
Colorado Springs Marathon, Half, 5K, and Kids K
1K5KHalf MarathonMarathon
- Price
- Free-$140.38
- Field size
- 20 · based on the organizer's entry cap
Sun, Oct 4, 2026 · 10:00 AM · Denver, CO
Liberty Energy 5K - Benefiting the Bettering Human Lives Foundation
1K5K
- Price
- Free-$38.35
Sun, Oct 4, 2026 · 10:00 AM · Aspen, CO
Rubey Rescue Run
1M3.5M
- Price
- $65
- Field size
- 150 · based on the organizer's entry cap
Sun, Oct 4, 2026 · 11:30 AM · Colorado Springs, CO
Kids' Fall Series - Where Kids Run Free!
- Price
- Free
Sun, Oct 4, 2026 · 10:00 AM · Colorado Springs, CO
Fall Series - Get Dirty! Get Muddy!
3.8M4M5.4M7.3M
- Price
- $42.34-$122.90
Sun, Oct 4, 2026 · 7:00 AM · Windsor, CO
Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run
1M5K10KHalf MarathonMarathon
- Price
- $20-$140