Running races in Colorado

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  MonsterDash Run

  Sat 24 Oct · Denver, CO · 10K · 5K · Kids Mile
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  Bridge Burner Ultra

  Sat 24 Oct · Canon City, CO · 35 Mile · 50k · 35k · 10k

  Along the Arkansas River, up to 7,109ft in Royal Gorge

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  MonsterDash Run

  Sun 25 Oct · Louisville, CO · 10K · 5K
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  Ghosts & Goblins 5K

  Sun 25 Oct · Denver, CO · 10K · 5K
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  Narrowleaf Lake Run

  Sat 31 Oct · Loveland, CO · 15K · 10K · Heavy 5K · Kids Fun Run · Kids Fun Run · 1 Mile Pumpkin

  Flat, paved course along Boyd Lake with lake views

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  November Trophy Series – 15Km and 5Km at Prairie Gateway Park

  Sun 1 Nov · Commerce City, CO · 15Km · 5Km

  Part of RMRR's season-long scoring series

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  All-Out Kooky-Spooky

  Sun 1 Nov · Golden, CO · Half Marathon · 10K · 5K

  Along Ralston Creek Trail past Arvada's Blunn Reservoir

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  Rim Rock Marathon & Half Marathon

  Sun 1 Nov · Grand Junction, CO · Marathon · Half Marathon

  Sweeping canyon views along famous Rim Rock Drive in Colorado

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  Bell Ringer 2-Miler

  Sat 7 Nov · Loveland, CO · 2-Mile

  Loveland's Veterans Day bell-ringing tradition, on foot

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  City Park Classic (5k/10k & 1 Mile Walk of Hope for Pancreatic Cancer Research)

  Sat 7 Nov · Denver, CO · 10k Run · 5k Run/Walk · 1.6 km

  Rocky Mountain views over Denver's City Park lake

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Flat & Friendly

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Turkey trots

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Beach & coast runs

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Trail escapes

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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.