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All-Out Spring Fever
Golden, CO
Sunday, March 22nd, 2026
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Central Park 5k
Denver, CO
The City Park Circuit, Powered by New Balance
Saturday, March 28th, 2026
Cryogenic Cannibal Chase
Estes Park, CO
Dance Marathon 5K
Fort Collins, CO
Sunday, March 29th, 2026
Spring Equinox
Wellington, CO
RMRR Spring Marathon Training Series #1
Thornton, CO
Cottonwood Glen T&H 12K
New Terrain Table Traverse
Erie Easter Bunny Hop
Erie, CO
Saturday, April 4th, 2026
Three Creeks Half Marathon
Englewood, CO
Sunday, April 5th, 2026
Run the Ranch
Loveland, CO
Friday, April 10th, 2026
ASDAsh 5K to Beat Tooth Decay
Aurora, CO
Saturday, April 11th, 2026
Dash for Detection: Oral Cancer Awareness 5K
Rockin on the River 5K
Littleton, CO
RMRR Spring Marathon Training Series #2
CRMAC Uplift Her - 5K Run/Walk
Healthy Kids Running Series Spring 2026 - Denve...
Sunday, April 12th, 2026
Hop Into Spring 5K - Denver
RMRR April Trophy Series
Donut Dash
Healthy Kids Running Series Spring 2026 - Auror...
Boulder Track Series Meet 1
Longmont, CO
Healthy Kids Running Series Spring 2026 - Fort ...
Platte River Half-Marathon and Relay
Prairie Dog Run Series
Louisville, CO
Spring Fling Prairie Dog Half, 10k, & 5k
Arvada, CO
Great Western Trail Race
Severance, CO
Saturday, April 18th, 2026
All-Out Beat the Heat
Westminster, CO
Kerr Gulch Amble
Evergreen, CO
DoNot Stop Half Marathon (5k/10k) - Denver
Sunday, April 19th, 2026
Fairmount Fit Fest
Horsetooth Half Marathon - Presented by Fort Co...
Hot Laps - Denver
Friday, April 24th, 2026
Bigfoot Half Marathon
Saturday, April 25th, 2026
Runs With Scissors Races
Brighton, CO
NoCo Half Marathon & 10K
Unicorn 5k (Denver-East)
Sunday, April 26th, 2026
Blue Heron Half & 5K
2026 Flying Pig 5K
Dash & Dine 5k
Boulder, CO
Tuesday, April 28th, 2026
Friends of the National Center Science Stride 5K
Friday, May 1st, 2026
22nd Annual Bob Turner Classic 5K Run/Walk
Berthoud, CO
Saturday, May 2nd, 2026
Adams County Foster Care 5K Run/Walk and 1 mile...
9th edition CollaBEERation 5k & Brew Fest Party
High Line Canal 5K/10K Run
Centennial, CO
The Colorado Marathon
Sunday, May 3rd, 2026
Rise Against Suicide’s Emerge 5K
Frank Shorter Track Classic
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