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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
Nielson Challenge
Colorado Springs, CO
Saturday, September 6th, 2025
HRCA Wildcat Mountain Trail Races
Littleton, CO
RexRun For PAWSitivity 2025 5K Trail Run/Walk
Aurora, CO
Denver Rocks Run 5K/10K
Sunday, September 7th, 2025
Conservation Colorado 5k
Rebel Run 5k
Flyin' Lion 5K
RMRR Fall Marathon Training Series #2
Thornton, CO
RMRR September Trophy Series
Spooky Sprint - Colorado Springs
Saturday, September 13th, 2025
The Denver 5k
All-Out Fall Fest
Westminster, CO
National Chocolate Day: Run for Chocolates DENV...
Centennial, CO
Parker Parks and Recreation So Long to Summer 5...
Historic Elizabeth Main Street 5K & Family Colo...
Elizabeth, CO
Flying Falcon Downhill Mile
USAF Academy, CO
9/11 Heroes Run - Denver, Colorado
Sunday, September 14th, 2025
[CANCELLED] Sloan's Lake Search Party (SLSP) Ma...
Spooky Sprint - Denver
Colorado Run for the Fallen 6 Hour Run/Walk/Ruck
Palmer Lake, CO
Pikes Peak Ascent
Manitou Springs, CO
Saturday, September 20th, 2025
2025 Montbello Alive! 5K
D 4.9 k
Peyton, CO
Move Forward 5K & 10K
Miles 4 Madison 5K & 1K
Denver: Walk With Autism and Resource Fair
19th Annual Golden Gallop
Golden, CO
Sunday, September 21st, 2025
Pikes Peak Marathon
Farmers 5000
Wheat Ridge, CO
RMRR Fall Marathon Training Series #3
Tiger Prowl 5K
HRCA Oktoberfest 5K
Saturday, September 27th, 2025
National Singles Day: Singles & Friends Running...
Runway 5K - Run for the Angels
Broomfield, CO
Toughest Mudder Colorado 2025
Ft. Carson, CO
Pioneer Prairie Dog Half, 10k & 5k
National Coffee Day: Run for Coffee DENVER/AURORA
Lisa Nelson’s Mustang Stampede 5K
Arvada, CO
WWE ANNUAL RUN WITH THE WOLVES
Sunday, September 28th, 2025
Colorado Coyotes Youth XC Invitational
Cenennial, CO
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