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Labor Day Half Marathon
Parker, CO
Monday, September 1st, 2025
3rd Annual Roost Rebellion Relays
Denver, CO
Wednesday, September 3rd, 2025
HRCA Wildcat Mountain Trail Races
Littleton, CO
Saturday, September 6th, 2025
RexRun For PAWSitivity 2025 5K Trail Run/Walk
Aurora, CO
Conservation Colorado 5k
Sunday, September 7th, 2025
RMRR Fall Marathon Training Series #2
Thornton, CO
Buffalo Bicycle Classic
Boulder, CO
Rebel Run 5k
RMRR September Trophy Series
Flyin' Lion 5K
Denver Rocks Run 5K/10K
Historic Elizabeth Main Street 5K & Family Colo...
Elizabeth, CO
Saturday, September 13th, 2025
Parker Parks and Recreation So Long to Summer 5...
The Denver 5k
Flying Falcon Downhill Mile
USAF Academy, CO
Muddy Dash | Denver
Erie, CO
National Chocolate Day: Run for Chocolates DENV...
Centennial, CO
All-Out Fall Fest
Westminster, CO
Colorado Run for the Fallen 6 Hour Run/Walk/Ruck
Palmer Lake, CO
Sunday, September 14th, 2025
Spooky Sprint - Denver
9/11 Heroes Run - Denver, Colorado
[CANCELLED] Sloan's Lake Search Party (SLSP) Ma...
Denver: Walk With Autism and Resource Fair
Saturday, September 20th, 2025
D 4.9 k
Peyton, CO
Miles 4 Madison 5K & 1K
2025 Montbello Alive! 5K
Move Forward 5K & 10K
Tiger Prowl 5K
Sunday, September 21st, 2025
19th Annual Golden Gallop
Golden, CO
Farmers 5000
Wheat Ridge, CO
RMRR Fall Marathon Training Series #3
Runway 5K - Run for the Angels
Broomfield, CO
Saturday, September 27th, 2025
Pioneer Prairie Dog Half, 10k & 5k
HRCA Oktoberfest 5K
Lisa Nelson’s Mustang Stampede 5K
Arvada, CO
National Singles Day: Singles & Friends Running...
National Coffee Day: Run for Coffee DENVER/AURORA
WWE ANNUAL RUN WITH THE WOLVES
Sunday, September 28th, 2025
The Palmer Lake .5K (Yes "Point" 5)
Colorado Coyotes Youth XC Invitational
Cenennial, CO
Big Waves Family 5K run/walk Presented by Brumate
Saturday, October 4th, 2025
Not So Flatt Breast Cancer Awareness Run/Walk –...
PRA Miner Gold Rush
RunAbilities FUN Walk/Run/Roll
I Can 5k
Liberty Energy 5K - Benefiting the Bettering Hu...
Sunday, October 5th, 2025
Strides for Sierra 5K run/walk
Healthy Kids Running Series Fall 2025 - Denver, CO
Layafette Music Fest Half-Marathon/10K/5K
Louisville, CO
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