Race Start End City State
Run for Mental Health 5K/10K/13.1 DENVER/AURORA May. 23, '26 May. 23, '26 Centennial CO REGISTER
DRMABPsi 1–5K Walk, Run & Roll May. 30, '26 May. 30, '26 Denver CO REGISTER
M1LE Nation Challenge May. 30, '26 Jun. 7, '26 Anywhere CO REGISTER
Sunrise Marathon 5K/10K/13.1 DENVER/AURORA May. 2, '26 May. 2, '26 Centennial CO REGISTER
The Narrow Gauge Races May. 24, '26 May. 24, '26 Durango CO REGISTER
2026 Five Star 5K, Mile of Smiles, and Wellness Festival May. 9, '26 May. 9, '26 Brighton CO REGISTER
Canine On the Creek May. 17, '26 May. 17, '26 Dumont CO REGISTER
Gluten Free Gallop 5K May. 16, '26 May. 16, '26 Littleton CO REGISTER
Parker Parks and Recreation Miles over the Meadow Mother’s Day 5K & Family Fun Trek May. 9, '26 May. 9, '26 Parker CO REGISTER
Cinco De Mayo Run 5K/10K/13.1 DENVER/AURORA May. 2, '26 May. 2, '26 Centennial CO REGISTER
Mile High Mile May. 23, '26 May. 23, '26 Boulder CO REGISTER
Hometown Half Marathon & 5k/10k - Denver May. 10, '26 May. 10, '26 Denver CO REGISTER
Farish Trail Race May. 23, '26 May. 23, '26 Woodland Park CO REGISTER
Memorial Day Run 5K/10K/13.1 DENVER/AURORA May. 23, '26 May. 23, '26 Centennial CO REGISTER
Run for the Trees - BSBF 2-Mile Run May. 9, '26 May. 9, '26 Loveland CO REGISTER
Run For The Trees - 2 Mile Fun Run May. 9, '26 May. 9, '26 Loveland CO REGISTER
AdventHealth Race to Rebuild May. 20, '26 May. 20, '26 Lone Tree CO REGISTER
Adams County Foster Care 5K Run/Walk and 1 mile fun run May. 2, '26 May. 2, '26 Brighton CO REGISTER
Springs Splash & Dash May. 9, '26 May. 9, '26 Colorado Springs CO REGISTER
Mile High Rescue Sixth annual 5K! Running for Rescues! & Summer Kick Off Party May. 31, '26 May. 31, '26 Englewood CO REGISTER
Hometown Half Marathon & 5k/10k - Colorado Springs May. 9, '26 May. 9, '26 Colorado Springs CO REGISTER
Frank Shorter Track Classic May. 3, '26 May. 3, '26 Longmont CO REGISTER