September Races in Colorado
Evergreen, CO
Bergen Peak Half Marathon
Sep 14, 2024
Glenwood Springs, CO
Sunlight Showdown
Sep 22, 2024
Thornton, CO
RMRR Fall Marathon Training Series
Aug 27, 2023
Sep 24, 2023
Sep 10, 2023
RMRR Trophy Series - September
Sep 8, 2024
Greeley, CO
Superhero Event
Sep 21, 2024
Denver, CO
Blue Shoe Run for Prostate Cancer
Sep 9, 2023
9/11 Heroes Run
Sep 10, 2023
Sentir Venezolano 5K Walk / Run
Sep 17, 2023
Roadrunners 5K
Sep 30, 2023
Roost Rebellion Relays
Sep 4, 2024
Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
Sep 7, 2024
Denver Rocks Run 5K/10K
Sep 8, 2024
Colorado Brewery Running Series
Sep 14, 2024
Denver 5K
Sep 14, 2024
Nun Run
Sep 15, 2024
Move Forward 5K & 10K
Sep 21, 2024
Crested Butte, CO
Emma Coburn's Elk Run 5K
Sep 30, 2023
Crested Butte Ultra
Sep 28, 2024
Colorado Springs, CO
Ruffin' Mudder
Sep 9, 2023
Be Ovary Aware 5K
Sep 17, 2023
Race Against Suicide
Sep 17, 2023
PPCC Take the Night Back
Sep 21, 2023
Nielson Two Mile Challenge
Mar 1, 2025
Apr 6, 2024
May 4, 2024
Jun 1, 2024
8 more
Orangetheory 5K at Labor Day Lift Off
Sep 1, 2024
Colorado Springs Marathon
Sep 28, 2024
Aurora, CO
RexRun For PAWSitivity 5K Trail Run/Walk
Sep 7, 2024
SheSprints
Sep 7, 2024
OCA Panda Run
Sep 21, 2024
Durango, CO
Lake Nighthorse Triathlon
Sep 9, 2023
Mountain Marmot Trail Run
Sep 23, 2023
Valkyrie Multisport Relay
Sep 14, 2024
Idaho Springs, CO
Flaming Foliage Relay
Sep 6, 2024
Grand Junction, CO
Spirit of the Valley 5K
Sep 14, 2024
Woodland Park, CO
Pony Express Run
Sep 22, 2024
Golden, CO
Golden Gallop
Sep 22, 2024
Georgetown, CO
Colorado Brewery Running Series
Sep 28, 2024
Steamboat Springs, CO
10K at 10,000 Feet Trail Run
Sep 1, 2024
Run Rabbit Run
Sep 14, 2024
Sep 13, 2024
Emerald Mountain Trail Run
Sep 28, 2024
Buena Vista, CO
Flaming Foliage Relay
Sep 6, 2024
Trail Sisters Women's Half Marathon
Sep 14, 2024
Autumn Run
Sep 21, 2024
West Line Winder
Sep 28, 2024
14er Fest Races
Sep 29, 2024
Winter Park, CO
Elevation Everest - The Half Everest
Sep 28, 2024
Manitou Springs, CO
Pikes Peak Ascent and Marathon
Sep 22, 2024 - Marathon
Sep 21, 2024 - Ascent
Louisville, CO
Louisville Trail Race
Sep 28, 2024
Castle Rock, CO
Tri the Rock
Sep 8, 2024
Nederland, CO
Ned Ned Run
Sep 9, 2023
Broomfield, CO
Jag Jog 5K
Sep 14, 2024
Miner Gold Rush
Sep 28, 2024
Runway 5K Run for the Angels
Sep 28, 2024
Marble, CO
Lead King Loop Charity Race
Sep 15, 2024
Aspen, CO
Aspen parkrun
Mar 22, 2025
Mar 29, 2025
Apr 5, 2025
Apr 13, 2024
48 more
Golden Leaf Half Marathon
Sep 28, 2024
Highlands Ranch, CO
BackCountry 5K
Sep 17, 2023
Littleton, CO
Lions Roar 5K
Sep 17, 2023
Lookin For A Cure Denver
Sep 23, 2023
Second Wind Walk/Run
Sep 24, 2023
HRCA Oktoberfest 5K
Sep 14, 2024
Flyin' Lion 5K
Sep 15, 2024
Miles 4 Madison 5K
Sep 21, 2024
HRCA Wildcat Mountain Trail Races
Sep 28, 2024
Frisco, CO
Run the Rockies Half Marathon
Sep 21, 2024
Arvada, CO
Lisa Nelson's Mustang Stampede
Sep 16, 2023
Forge 5K
Sep 30, 2023
Run With The Wolves
Sep 29, 2024
Estes Park, CO
Rut Run 5K
Sep 28, 2024
Boulder, CO
South Boulder Creek parkrun
Mar 22, 2025
Mar 29, 2025
Apr 5, 2025
Apr 13, 2024
48 more
Harvest Moon Long Course Triathlon
Sep 7, 2024
Boulderthon: Downtown Boulder Marathon
Sep 29, 2024
Copper Mountain, CO
Summit Up Trail Run
Sep 9, 2023
Brighton, CO
Adams Half & 5K
Sep 17, 2023
Breckenridge, CO
Breck Crest Mountain Marathon
Sep 3, 2023
Lafayette, CO
Waneka Classic
Sep 9, 2023
Lone Tree, CO
For a City 5K
Sep 16, 2023
Morrison, CO
RRCC Front Nine 5K
Sep 15, 2024
Pagosa Springs, CO
Mountain Chile Cha Cha Trail Races
Sep 23, 2023
Alberta Peak Challenge
Sep 7, 2024
Wheat Ridge, CO
Farmers 5000
Sep 15, 2024
Telluride, CO
Blisters & Brews 5K
Sep 14, 2023
Imogene Pass Run
Sep 7, 2024
Deep Creek Trail Half Marathon
Sep 28, 2024
Windsor, CO
Windsor Wiesn Mile and 5 Mile
Sep 23, 2023
Greenwood Village, CO
Tri-Our-Village Youth Triathlon
Sep 10, 2023
Selian 5K
Sep 16, 2023
Bellvue, CO
Black Squirrel Half Marathon
Sep 7, 2024
Lakewood, CO
Bark & Brew 5K
Sep 9, 2023
Tiger Prowl
Sep 10, 2023
Lakewood Trail Series
Sep 4, 2024
Sep 11, 2024
Sep 18, 2024
Sep 25, 2024
Littlefoot Triathlon
Sep 7, 2024
Bear Chase Race - Half Marathon & 10K
Sep 29, 2024
Sep 28, 2024
Montrose, CO
Black Canyon Triathlon
Sep 28, 2024
Canon City, CO
Wine Run 5K at Holy Cross Abbey
Sep 1, 2024
Commerce City, CO
Night Nation Run - Denver
Sep 28, 2024
Palmer Lake, CO
24 Hours of Palmer Lake
Sep 28, 2024
Beaver Creek, CO
The bRUNch Trail Run
Sep 17, 2023
Sterling, CO
Center of the Nation Series - Day 1
Sep 30, 2024
Monument, CO
Run4Hope 5K for Schools
Sep 21, 2024
Keystone, CO
Cirque Series - Arapahoe Basin
Sep 7, 2024
Bayfield, CO
Bayfield Heritage Days 5K
Sep 28, 2024
Empire, CO
Devil on the Divide
Sep 7, 2024
Beulah, CO
Beulah Challenge
Sep 21, 2024
Minturn, CO
Meadowgold Trail Run
Sep 14, 2024
Fort Collins, CO
Beef Sticks for Backpacks 5K Run/Walk
Sep 24, 2023
Fall Equinox Marathon
Sep 22, 2024
Deckers, CO
Battle by the Brook
Sep 21, 2024
Frederick, CO
Miner's Day 5K
Sep 16, 2023
La Salle, CO
Cerus Fitness Festival
Sep 14, 2024
Nathrop, CO
Sawatch Ascent
Sep 29, 2024
Red Feather Lakes, CO
Lederhosen Run
Sep 23, 2023
Red Feather Trail Jamboree
Sep 21, 2024
Sep 20, 2024
Sep 22, 2024
Jamestown, CO
Calarat Challenge Trail Running Festival
Sep 3, 2023
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Event Category
Click Here to find out what Classic, Multisport, and Variety mean.
To narrow your search by a distance or event type, you will need to select Classic, Multisport, or Variety first.
To narrow your search by a distance or event type, you will need to select Classic, Multisport, or Variety first.
City Location
61. Flyin' Lion 5K
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Sep 15, 2024Sunday
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5K run
More Information
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Littleton, CO
Arapahoe County, CO
62. Lead King Loop Charity Race
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Sep 15, 2024Sunday
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25K trail run
More Information
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Marble, CO
Gunnison County, CO
63. Nun Run
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Sep 15, 2024Sunday
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13.1M, 5K run
More Information
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Denver, CO
Denver County, CO
64. RRCC Front Nine 5K
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Sep 15, 2024Sunday
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5K run
More Information
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Morrison, CO
Jefferson County, CO
65. For a City 5K
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Past DateSep 16, 2023Saturday
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5K run
More Information
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Lone Tree, CO
Douglas County, CO
66. Lisa Nelson's Mustang Stampede
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Past DateSep 16, 2023Saturday
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5K run
More Information
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Arvada, CO
Jefferson County, CO
67. Miner's Day 5K
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CancelledSep 16, 2023Saturday
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5K run | kids run
More Information
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Frederick, CO
Weld County, CO
68. Selian 5K
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Past DateSep 16, 2023Saturday
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5K run
More Information
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Greenwood Village, CO
Arapahoe County, CO
69. Stephanie L. Miner 5K Walk and Run
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Past DateSep 16, 2023Saturday
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5K run
More Information
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Alamosa, CO
Alamosa County, CO
70. Adams Half & 5K
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Past DateSep 17, 2023Sunday
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13.1M, 5K run
More Information
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Brighton, CO
Adams County, CO
71. BackCountry 5K
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Past DateSep 17, 2023Sunday
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5K run
More Information
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Highlands Ranch, CO
Douglas County, CO
72. Be Ovary Aware 5K
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Past DateSep 17, 2023Sunday
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5K run
More Information
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Colorado Springs, CO
El Paso County, CO
73. Lions Roar 5K
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Past DateSep 17, 2023Sunday
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5K run
More Information
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Littleton, CO
Arapahoe County, CO
74. Race Against Suicide
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Past DateSep 17, 2023Sunday
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5K, 3K run
Virtual OptionMore Information
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Colorado Springs, CO
El Paso County, CO
75. Sentir Venezolano 5K Walk / Run
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Past DateSep 17, 2023Sunday
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5K run
More Information
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Denver, CO
Denver County, CO
76. The bRUNch Trail Run
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Past DateSep 17, 2023Sunday
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15K, 10K, 5K trail run
More Information
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Beaver Creek, CO
Eagle County, CO
77. Unity for our Community 5K
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Past DateSep 17, 2023Sunday
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5K run
More Information
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Silt, CO
Garfield County, CO
78. Lakewood Trail Series
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Sep 18, 2024Wednesday
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7M, 4M trail run
More Information
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Lakewood, CO
Jefferson County, CO
79. Red Feather Trail Jamboree
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Sep 20, 2024Friday
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50K trail run
More Information
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Red Feather Lakes, CO
Larimer County, CO
80. Aspen parkrun
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Sep 21, 2024Saturday
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5K run
More Information
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Aspen, CO
Pitkin County, CO
For the love of all that Is good And moisture wicking...
Though we Try To be accurate And On top Of things... Race details can change When we aren't lookin. And once in a while we simply make a mistake.
ALWAYS visit the race's website for the most complete and accurate race information.
ALWAYS visit the race's website for the most complete and accurate race information.