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Greenland Trail Race

The Greenland Trail Race offers 4 distances in southern Douglas County Colorado every May. Run the 4M, the 8M, the 25K, or the 50K, Colorado fastest 50K! With smooth trails …

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Colorado Marathon

The Colorado Marathon is an annual race held in the verdant Poudre Canyon, nestled in the picturesque Rocky Mountains, just outside of the beautiful city of Fort Collins. Registration for …

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2025 Moose Mudder 5K

Altitude Elementary School 27300 E Southshore Dr, Aurora, CO, United States

Please join us for the 2025 Moose Mudder 5K! This is a community event that will consist of an untimed 1k fun walk/run and a timed 5k followed by an …

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Mountain Ridge Trail Race

Mountain Ridge Middle School 10590 Mountain Vista Ridge, Highlands Ranch, CO, United States

Mountain Ridge takes place near Highlands Ranch primarily on the Douglas County East-West Regional Trail. This gently rolling course will keep the Heart Rate pumping while offering some of the …

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Highlands Ranch Mothers Day 5k

Cresthill Middle School 9195 Cresthill Ln, Highlands Ranch, CO

The HRCA Mother's Day 5K is a family-friendly race taking place on Saturday, May 10, 20245 This course is suitable for participants of all levels, whether they are first-time 5K …

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Mother’s Day Run

Great Lawn Park 101 Yosemite St, Denver, CO

Whether you choose the Louisville Trails on Saturday near old town, or at the urban paths of Great Lawn Park in Eastern Denver...the Mothers Day Runs are all about Family, …

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Colfax Marathon Weekend

The biggest running weekend of the year kicks off on Saturday May 18th with the Colfax 5K at City Park.  Stick around to catch the Girls on the Run 5K …

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Bolder Boulder 10K

Boulder Boulder, CO

Join Colorado’s biggest and boldest Memorial Day tradition. 

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Flamingo Day 5K

Sloan's Lake 4600 W Bryon Pl, Denver, CO

Join us for a fun event at Denver's Sloan's Lake Park.