Ultras in Colorado — 2026

There are 33 ultras in Colorado scheduled for 2026. The next is the Turkey Trails- Denver in Littleton on November 7. Colorado ultras run primarily November through October.

Turkey Trails- Denver

Sat, Nov 7 · Littleton, CO Littleton

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

1 Mile5KGirls on the Run - 5k +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

5KKids 800M

From $15 Open

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The Pilgrimage Run 2026

Thu, Nov 26 · Erie, CO Erie

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

1 Mile5K10K +7

From $22 Open 5 spots left

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Candy Cane Course - Denver

Sun, Dec 6 · Westminster, CO Westminster

1 Mile5K10K +7

From $22 Open 5 spots left

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WinterFest 5k & Fun Run

Sat, Dec 12 · Thornton, CO Thornton

5k Run/Walk -TIMED and ScoredFun Run/Walk (Untimed, approx .75 miles)

From $16.5 Open

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2026 Jingle Bell Run - Colorado

Sun, Dec 13 · Denver, CO Denver

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

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

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

5K Run10k RunHalf Marathon Run +9

From $49 Open

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The Grand Traverse

Sun, Mar 28 · Crested Butte, CO Crested Butte

RunBikeTriple Crown +7

From $205 Closed 60 spots left

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NoCo Urban Ultra & Relay

Sun, Apr 11 · Bellvue, CO Bellvue

50 Mile (Relay)50 Mile (Individual)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

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

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

5k5k1/2 Mile(ish) Saunter +1

From $13 Open

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Greenland Trail Races

Sat, May 1 · Larkspur, CO Larkspur

4 Mile4M Trail Races8M 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

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

1 Mile1 Mile5K +11

From $17 Open 5 spots left

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Weld Your Mettle Running Festival

Sat, Jun 5 · Eaton, CO Eaton

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

From $35 Open Closing Soon

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M1LE Nation Challenge

Fri, Jun 11 · Fort Collins, CO Fort Collins

M1LE Nation- LIVE RaceTeam M1LE Nation- Virtual RaceTeam M1LE Nation- 4x400 +5

From $10 Closed

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Red, White, and WARRIOR 5K

Sat, Jul 3 · Grand Junction, CO Grand Junction

Red, White, and WARRIOR 5KRed, White, and WARRIOR 5KLittle Sparkler Sprint +1

From $10 Closed

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Heatwave Half Marathon/5K/10K - Denver

Sat, Jul 17 · Denver, CO Denver

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

1 Mile1 Mile5K +12

From $17 Open 5 spots left

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Wild West Relay

Fri, Aug 6 · Fort Collins, CO Fort Collins

Wild West Relay - Ultra team (4-6 runners)Wild West Relay - Get Your Ass Over the Pass - Super Ultra team (1-3 runners)Wild West Relay - Super Ultra team (1-3 runners) +5

From $660 Open

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Summer Sizzler- Denver

Sat, Aug 7 · Denver, CO Denver

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

1 Mile1 Mile5K +11

From $17 Open 5 spots left

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Flaming Foliage Relay - Idaho Springs to Buena Vista

Fri, Sep 10 · Idaho Springs, CO Idaho Springs

Flaming Foliage Relay - Super Ultra (1-3 runners)Flaming Foliage Relay - 10 person Team (6-10 runners)Flaming Foliage Relay - Super Ultra (1-3 runners) +3

From $623 Closed

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

Sat, Sep 11 · Denver, CO Denver

1 Mile1 Mile5K +11

From $17 Open 5 spots left

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The Denver 5k

Sat, Sep 11 · Denver, CO Denver

5k5kFREE Kids Fun Run +1

From $0 Open

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2027 Lake Nighthorse Triathlon - Sprint and Olympic

Sat, Sep 11 · Durango, CO Durango

Individual SprintSprint Relay - MaleSprint Relay - Female +7

From $85 Closed 9 spots left

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

Sun, Sep 12 · Colorado Springs, CO Colorado Springs

1 Mile1 Mile5K +11

From $17 Open 5 spots left

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Spooky Sprint - Denver

Sat, Oct 2 · Denver, CO Denver

1 Mile1 Mile5K +14

From $20 Open 5 spots left

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