Apr 10, 2027
Sloth Run 5K/10K/13.1 DENVER/AURORA
Centennial, CO
Half Marathon, 10K, 5K, 1 mi
Key dates
Registration opens
Jun 1, 2026
Registration closes
May 16, 2027
Race day
May 16, 2027
Email me updates about Denver Colfax Marathon
Registration openings and major changes, like a new date or a cancellation.
Entry transfers
Tune-up races
- Apr 24, 2027
Coffee Lover Run DENVER/AURORA
Aurora, CO
Half Marathon, 10K, 5K, 1 mi
- Mar 27, 2027
Always Hope Easter Run 5K/10K/13.1 DENVER/AURORA
Centennial, CO
Half Marathon, 10K, 5K, 1 mi
- Apr 17, 2027
Rattler Trail Race
Colorado Springs, CO
50K, 25K, 10K, 5K
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Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA
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Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA
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- Dec 26
A Merry Christmas Run 5K/10K/13.1 DENVER/AURORA
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Half Marathon, 10K, 5K, 1 mi
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MLK Jr. Freedom Run 5K/10K/13.1 DENVER/AURORA
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Races Near Denver
- Nov 1
RMRR November 5k/15k
Denver, CO
15K, 5K
- Nov 7
City Park Classic (5k/10k & 1 Mile Walk of Hope for Pancreatic Cancer Research)
Denver, CO
10K, 5K, 1 mi
- Nov 14
Denver Veterans Day Run
Denver, CO
10K, 5K
- Nov 26
Mile High United Way Turkey Trot
Denver, CO
4 mi, 1 mi
- Dec 6
Rudolph Ramble 5K Run/Walk
Denver, CO
5K
- Jan 17, 2027
Polar Bear 5K
Denver, CO
- Feb 7, 2027
Super Bowl 5K
Denver, CO
- Feb 14, 2027
Valentine's Day 4M
Denver, CO
4 mi
- Nov 8
Dragon Dash 5K Run/Walk
Denver, CO
5K
- Nov 1
Feet for Justice Run
Denver, CO
10K, 5K
- Nov 21
Feed Your Soul Turkey Trot 5K
Wheat Ridge, CO
5K
May Races Nearby
- May 1, 2027
Collegiate Peaks Trail Run
Buena Vista, CO
50 mi, 25 mi
- May 1, 2027
Take 5 in the Garden
Colorado Springs, CO
5 mi, 5K
- May 8, 2027
Valkyrie Trail Race
Colorado Springs, CO
50K, Marathon, 30K, Half Marathon, 8 mi, 4 mi
- May 22, 2027
Samson's Revenge
Estes Park, CO
50K, 25K, 10K
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Listed from Race Roster. Checked Nov 1, 2026.