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Rock Hawk Trail Races - 10K | 5K

Aug 29, 2026

Held on the gorgeous, thrilling and rolling trails of Castle Rock’s Miller Park & Ridgeline Trail systems.While no...

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RexRun For PAWSitivity - 5K

Aug 29, 2026

Join us for a fun filled day focused on physical & mental wellness, family, fun and our furry friends....

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Pioneer Prairie Dog - Half Marathon | 10K | 5K

Aug 23, 2026

Welcome to the Pioneer Prairie Dog Half Marathon event; the one that started the series! With 10k and 5k events too!Ever...

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Staunton Rocks! - Marathon | Half Marathon

Aug 22, 2026

Welcome to the Staunton Rocks! Marathon & Half, an event put on by trail runners for trail runners.Touring the renow...

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Byers Peak Stampede - Half Marathon | 5K

Aug 22, 2026

Lace up your running shoes and join us for the Byers Peak Stampede! Whether you’re up for a scenic 5K stroll or ready ...

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Leadville - 10K

Aug 16, 2026

As the shortest race in the Leadville Race Series, the Leadville 10K Run offers runners a unique opportunity to experien...

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Erie - Half Marathon | 5K

Aug 16, 2026

Join us for the Erie Half and 5k!The Hometown Race Series features half marathons and 5k distance events in outlying com...

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Mt. Sneffels - 5K

Aug 15, 2026

Since 1992, the Mount Sneffels Education Foundation has funded over $1.5 million into over 865 programs, enriching the l...

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Mt. Sneffels - Half Marathon

Aug 15, 2026

Since 1992, the Mount Sneffels Education Foundation has funded over $1.5 million into over 865 programs, enriching the l...

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Just Peachy - 10K | 5K

Aug 15, 2026

Join the Grand Junction Sports Commission for the Just Peachy 5K & 10K. This fun 5K is great for families and begin...

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Run The Rockies Trail - Half Marathon | 10K | 5K

Aug 08, 2026

The Run the Rockies Trail 5k, 10k, and half marathon will lead runners through the Frisco Peninsula trails with breathta...

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All-Out Runapalooza - Half Marathon | 10K | 5K

Aug 08, 2026

Don't miss the 14th annual Runapalooza benefiting Salute Colorado! As summer mornings begin to cool, join us for a fanta...

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Lory Summer Trail Series - 5K

Aug 25, 2026

Join us this August for a fun series of shorter midweek trail races. Our goal is to offer a fun, low-key series of races...

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Lory Summer Trail Series - 5K

Aug 18, 2026

Join us this August for a fun series of shorter midweek trail races. Our goal is to offer a fun, low-key series of races...

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Lory Summer Trail Series - 5K

Aug 11, 2026

Join us this August for a fun series of shorter midweek trail races. Our goal is to offer a fun, low-key series of races...

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Lory Summer Trail Series - 5K

Aug 04, 2026

Join us this August for a fun series of shorter midweek trail races. Our goal is to offer a fun, low-key series of races...

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Bound For Boston - Denver - Marathon | Half Marathon

Aug 02, 2026

Have you been dreaming of running Boston? Need to shave a few minutes off your time to qualify? Looking for the perf...

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Wicked Wine Run - Denver - 5K

Aug 01, 2026

Once you arrive on site, head to the Check-In tents to get checked in and your goodie bag. Be sure to swing by our merch...

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Unicorn - South - 5K

Aug 01, 2026

Ready to get off the sofa and gallop around Highlands Ranch with some friends? Yeah, you are! Come frolic with us at t...

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Sheep Mountain Trail Run - Half Marathon

Aug 01, 2026

Come ready my friends, this mountain throws everything it has at trail and ultra runners alike, challenging you from sta...

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Rocky Mountain - Half Marathon

Aug 01, 2026

This is a challenging but scenic run just outside Rocky Mountain National Park. It starts and ends by the lake at the fa...

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Rocky Mountain - 5K

Jul 31, 2026

This is a challenging but scenic run just outside Rocky Mountain National Park. It starts and ends by the lake at the fa...

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Aspen Backcountry - Marathon | Half Marathon

Aug 01, 2026

Utilizing the beautiful trails that surround Aspen, and now offering three distances - 50K, marathon and heavy half-mara...

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Spirit Of The West - 5K

Jul 26, 2026

This fundraising event benefits the Westernaires youth riding organization from Golden, Colorado. Founded in 1949, West...