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That Dam Run
Around Cherry Creek Reservoir at the dam south of Denver
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Time to Paddy 5K/10K & Lucky 13.1
St Patrick's themed run at Norris Penrose, Colorado Springs
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America's Uphill
Climb 3267 feet up Aspen Mountain to the Sundeck
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Luck of the Irish
Views of Buffalo Pass through historic Steamboat Springs
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CS St. Patrick's Day Parade
Starts and finishes on N Tejon St, Colorado Springs
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Run Through Time Trail Marathon
Singletrack climbs from 7000 to 9000 feet in the Colorado high country
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Runnin' of the Green
Loops Denver's Washington Park for St Patrick's Day
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Spring Equinox Half Marathon & 5K
Half the dirt, half the asphalt, starting at a brewery
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All-Out Spring Fever
Set against Table Mountain in the Colorado foothills
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Cryogenic Cannibal Chase 8k
An 8K loop around frozen Lake Estes
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RMRR Marathon Training Series
Supported 10 and 20 mile marathon build-up races
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The City Park Circuit
Loops around Denver's City Park lake and zoo
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Central Park 5k
Flat, fast 5K through Denver's Central Park neighborhood
Save any of these to your season in RunCalendar and hear the morning entries open. Free on iPhone, no account needed.
Every race here is published by its organiser; RunCalendar checks the date and the entry window against the organiser's own page and rebuilds this calendar every night. A confirmed date shows its day; a provisional one shows only its month. Last updated 22 October 2026.