Ultra Races in Colorado

I Ain't Scared (of 5k)

Sat, Oct 31 · Thornton, CO Thornton

Road 5k

From $29 Open Closing Soon

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Turkey Trails- Denver

Sat, Nov 7 · Littleton, CO Littleton

Virtual 1 Mile5K10K +7

From $17 Open Closing Soon 5 spots left

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Turkey Trails - Colorado Springs

Sun, Nov 8 · Colorado Springs, CO Colorado Springs

Virtual 1 MileGirls on the Run - 5k5K +8

From $17 Open Closing Soon 5 spots left

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Alpine Bank Boulder Thanksgiving Day 5K

Thu, Nov 26 · Boulder, CO Boulder

Road 5KKids 800M

From $15 Open

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The Pilgrimage Run 2026

Thu, Nov 26 · Erie, CO Erie

Road 2 Mile Run / Walk4 Mile Run4 Mile Run (Chip Timed) +1

From $25 Open

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Candy Cane Course - Colorado Springs

Sat, Dec 5 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5K10K +7

From $22 Open 5 spots left

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Candy Cane Course - Denver

Sun, Dec 6 · Westminster, CO Westminster

Virtual 1 Mile5K10K +7

From $22 Open 5 spots left

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2026 Jingle Bell Run - Colorado

Sun, Dec 13 · Denver, CO Denver

Virtual 1 Mile5K TimedKids Run +1

From $25 Open Closing Soon

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Time Travel Half-Marathon/5K/10K - Denver

Sat, Jan 30 · Westminster, CO Westminster

Virtual 1 Mile5K10K +4

From $15 Open Closing Soon 5 spots left

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Time Travel Half-Marathon/5K/10K - Colorado Springs

Sun, Jan 31 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5K10K +4

From $15 Open Closing Soon 5 spots left

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Old Man Winter Bike Rally & Run

Sun, Feb 7 · Lyons, CO Lyons

Triathlon 5K Run10k RunHalf Marathon Run +9

From $49 Open

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NoCo Urban Ultra & Relay

Sun, Apr 11 · Bellvue, CO Bellvue

Ultra 50 Mile (Individual)50 Mile (Relay)50 Mile (Individual) +5

From $65 Open

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DoNot Stop Half Marathon/5K/10K - Colorado Springs

Sat, Apr 24 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile1 Mile5K +13

From $0 Open Closing Soon 5 spots left

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DoNot Stop Half Marathon/5K/10K - Denver

Sun, Apr 25 · Denver, CO Denver

Virtual 1 Mile1 Mile5K +11

From $17 Open Closing Soon 5 spots left

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Unicorn 5k (Denver-East)

Sun, Apr 25 · Denver, CO Denver

Road 5k5k1/2 Mile(ish) Saunter +1

From $13 Open

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Greenland Trail Races

Sat, May 1 · Larkspur, CO Larkspur

Ultra 4M Trail Races4 Mile8M Trail Race +9

From $25 Open

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Hometown Half Marathon/5K/10K - Colorado Springs

Sat, May 8 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile1 Mile5K +11

From $17 Open 5 spots left

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Hometown Half Marathon/5K/10K - Denver

Sun, May 9 · Denver, CO Denver

Virtual 1 Mile1 Mile5K +11

From $17 Open 5 spots left

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Colorado Women's Classic - Westminster

Sun, May 9 · Westminster, CO Westminster

Road 5k5k10 Miler +3

From $35 Open

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Weld Your Mettle Running Festival

Sat, Jun 5 · Eaton, CO Eaton

Virtual 7k walk or run (4.3 miles)7K Ruck (4.3 Miles)7K Ruck (4.3 Miles) +23

From $35 Open Closing Soon

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Heatwave Half Marathon/5K/10K - Denver

Sat, Jul 17 · Denver, CO Denver

Virtual 1 Mile1 Mile5K +12

From $17 Open 5 spots left

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Heatwave Half Marathon/5K/10K - Colorado Springs

Sun, Jul 18 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile1 Mile5 K +12

From $17 Open 5 spots left

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Spirit of the West 5K Run/Walk

Sun, Jul 25 · Golden, CO Golden

Road 5K Run/Walk5K Run/Walk

From $35 Open

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Wild West Relay

Fri, Aug 6 · Fort Collins, CO Fort Collins

Wild West Relay - 12 person team (7-12 runners)Wild West Relay - Get Your Ass Over the Pass - 12 person team (7-12 runners)Wild West Relay - Get Your Ass Over the Pass - High School Team +5

From $660 Open

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Summer Sizzler- Denver

Sat, Aug 7 · Denver, CO Denver

Virtual 1 Mile1 Mile5k +11

From $17 Open 5 spots left

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Summer Sizzler- Colorado Springs

Sun, Aug 8 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile1 Mile5K +11

From $17 Open 5 spots left

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Golden Harvest Half Marathon & 5K/10K - Denver

Sat, Sep 11 · Denver, CO Denver

Virtual 1 Mile1 Mile5K +11

From $17 Open 5 spots left

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The Denver 5k

Sat, Sep 11 · Denver, CO Denver

Road 5k5kFREE Kids Fun Run +1

From $0 Open

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Golden Harvest Half Marathon & 5K/10K - Colorado Springs

Sun, Sep 12 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile1 Mile5K +11

From $17 Open 5 spots left

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Spooky Sprint - Denver

Sat, Oct 2 · Denver, CO Denver

Virtual 1 Mile1 Mile5K +14

From $20 Open 5 spots left

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