Aug 15, 2026 · 7:30 AM · Centennial, CO
Run for PB& J 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$48.70
Half Marathons in Colorado
Every upcoming Half Marathon race we know about in Colorado. Where a detail isn't confirmed, we mark it unknown rather than guessing.
Race results
Where
When
Showing 24+ of 75 races · loading the full list…
Aug 15, 2026 · 7:30 AM · Centennial, CO
Bagel Run 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$48.70
Aug 22, 2026 · 7:00 AM · Pine, CO
Staunton Rocks! Marathon and Half Marathon
Half MarathonMarathon4,500 ft gain
- Price
- $117.60-$138.80
- Field size
- 320 · based on the organizer's entry cap
Aug 22, 2026 · 8:00 AM · Fraser, CO
Byers Peak Stampede Half Marathon & 5K Run
Half Marathon
- Price
- $69.90-$91.10
Aug 23, 2026 · 7:30 AM · Westminster, CO
Pioneer Prairie Dog Half, 10k & 5k
5K10KHalf Marathon
- Price
- $45-$85
- Field size
- 150 · based on the organizer's entry cap
Aug 29, 2026 · 8:00 AM · Durango, CO
TBK Bank Thirsty 13 Half Marathon
Half Marathon
- Price
- $112.30-$148.34
- Field size
- 740 · based on the organizer's entry cap
Aug 29, 2026 · 7:30 AM · Centennial, CO
Sloth Run 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$54
Aug 29, 2026 · 7:30 AM · Centennial, CO
Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$54
Sep 5, 2026 · 8:00 AM · Westminster, CO
Golden Harvest Half Marathon & 5k/10k - Denver
1M5K10KHalf Marathon
- Price
- Free-$73.94
Sep 6, 2026 · 8:00 AM · Colorado Springs, CO
Golden Harvest Half Marathon & 5k/10k - Colorado Springs
1M5K10KHalf Marathon
- Price
- Free-$73.94
Sep 7, 2026 · 7:00 AM · Parker, CO
Labor Day Half Marathon
5K10KHalf Marathonflat and fastWalker-friendly · per organizer
- Price
- $37.64-$83
Sep 12, 2026 · 8:00 AM · Buena Vista, CO
Trail Sisters Women's Half Marathon & 10k
10KHalf Marathon
- Price
- $69.90-$107
- Field size
- 394 · based on the organizer's entry cap
Sep 12, 2026 · 7:00 AM · Bellvue, CO
Black Squirrel Half Marathon
Half Marathon
- Price
- $117.60
- Field size
- 300 · based on the organizer's entry cap
Sep 12, 2026 · 7:30 AM · Centennial, CO
National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$48.70
Sep 12, 2026 · 7:30 AM · Centennial, CO
Run for Mental Health 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$48.70
Sep 19, 2026 · 9:15 AM · Buena Vista, CO
Autumn Run
5K10KHalf Marathon
- Price
- Free-$108.25
- Field size
- 200 · based on the organizer's entry cap
Half Marathon7,867 ft gain
- Price
- Free-$239.50
- Field size
- 2,150 · based on the organizer's entry cap
Sep 25, 2026 · 6:00 AM · Red Feather Lakes, CO
Red Feather Trail Jamboree
Half MarathonUltra4,200 ft gain
- Price
- $107-$316
- Field size
- 200 · based on the organizer's entry cap
Sep 26, 2026 · 7:30 AM · Centennial, CO
Oktoberfest Run 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$48.70
Sep 26, 2026 · 7:30 AM · Centennial, CO
Run for Donuts 5K/10K/13.1 DENVER/AURORA
1M5K10KHalf Marathon
- Price
- $32.80-$48.70
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
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