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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
RexRun For PAWSitivity 2025 5K Trail Run/Walk
Aurora, CO
Saturday, September 6th, 2025
Flyin' Lion 5K
Littleton, CO
Sunday, September 7th, 2025
RMRR September Trophy Series
Thornton, CO
Rebel Run 5k
Conservation Colorado 5k
Denver Rocks Run 5K/10K
Muddy Dash | Denver
Dacono, CO
Saturday, September 13th, 2025
All-Out Fall Fest
Westminster, CO
The Denver 5k
Historic Elizabeth Main Street 5K & Family Colo...
Elizabeth, CO
National Chocolate Day: Run for Chocolates DENV...
Centennial, CO
Parker Parks and Recreation So Long to Summer 5...
9/11 Heroes Run - Denver, Colorado
Sunday, September 14th, 2025
Spooky Sprint - Denver
2025 Montbello Alive! 5K
Saturday, September 20th, 2025
Miles 4 Madison 5K & 1K
Move Forward 5K & 10K
Denver: Walk With Autism and Resource Fair
19th Annual Golden Gallop
Golden, CO
Sunday, September 21st, 2025
Tiger Prowl 5K
Farmers 5000
Wheat Ridge, CO
National Singles Day: Singles & Friends Running...
Saturday, September 27th, 2025
National Coffee Day: Run for Coffee DENVER/AURORA
Runway 5K - Run for the Angels
Broomfield, CO
Lisa Nelson’s Mustang Stampede 5K
Arvada, CO
Pioneer Prairie Dog Half, 10k & 5k
WWE ANNUAL RUN WITH THE WOLVES
Sunday, September 28th, 2025
I Can 5k
Saturday, October 4th, 2025
PRA Miner Gold Rush
Not So Flatt Breast Cancer Awareness Run/Walk
Big Waves Family 5K run/walk Whiteout Presented...
Liberty Energy 5K - Benefiting the Bettering Hu...
Sunday, October 5th, 2025
Strides for Sierra 5K run/walk
Layafette Music Fest Half-Marathon/10K/5K
Louisville, CO
RMRR October Trophy Series
Gummball 5K
Brighton, CO
Saturday, October 11th, 2025
Kipling Villas 5K - 2024
Boulder XC Series Meet 1
Boulder, CO
Westy Half & 5k
Sunday, October 12th, 2025
The bRUNch Run™
2025 DU Crimson Classic 5K Run/1.5 Mile Walk
Tuesday, October 14th, 2025
The Great Trailhead Foot Race 10 Miler & 5k
Lakewood, CO
Saturday, October 18th, 2025
Expo Park XC Runs
Sunday, October 19th, 2025
DU Crimson Classic 5K Run/1.5 Mile Walk
Wednesday, October 22nd, 2025
Apex Foundation Trick or Trot 5K & Halloween Hunt
Saturday, October 25th, 2025
2025 Eerie Erie
Erie, CO
Halloween Fun Run 5k & 1mile - Zombie Theme
Idaho Springs, CO
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