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Marathons Found In Colorado in September
View all ↓Marathons in Colorado in September 2025
Find A Race is the US's favourite event listings site. Check out our list of September 2025 Marathons in Colorado below.
Race Calendar: Marathons Found In September
🚀Boosted
Hedgehog Dash 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado
13 Sep 25
$32.80 - $48.70
🚀Boosted
National Chocolate Day: Run for Chocolates DENVER/AURORA
Centennial, Colorado
13 Sep 25
$32.80 - $48.70
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Fleet Feet Denver Fall Half-Marathon Twelve-Week Training Program
Littleton, Colorado
08 Jul 25 - 28 Sep 25
$155.00
Hedgehog Dash 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado
13 Sep 25
$32.80 - $48.70
National Chocolate Day: Run for Chocolates DENVER/AURORA
Centennial, Colorado
13 Sep 25
$32.80 - $48.70
Beulah Challenge and OverIt Series
Beulah, Colorado
20 Sep 25
$18.25 - $187.25
National Singles Day: Singles & Friends Running DENVER/AURORA
Centennial, Colorado
27 Sep 25
$32.80 - $48.70
National Coffee Day: Run for Coffee DENVER/AURORA
Centennial, Colorado
27 Sep 25
$32.80 - $48.70
Platte River Half-Marathon and Relay
Littleton, Colorado
13 Apr 25 - 12 Apr 26
$80.50 - $268.75
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