Ultras in Colorado — 2026

There are 33 ultras in Colorado scheduled for 2026. The next is the Durango Marathon in Durango on October 11. Colorado ultras run primarily October.

Durango Marathon

Sun, Oct 11 · Durango, CO Durango

Durango Marathon Weekend 5kDurango Half MarathonDurango Marathon

From $20 Open Closing Soon

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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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The Pilgrimage Run 2026

Thu, Nov 26 · Erie, CO Erie

2 Mile Run / Walk4 Mile Run (Chip Timed)4 Mile Run +1

From $25 Open

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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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Candy Cane Course - Colorado Springs

Sat, Dec 5 · Colorado Springs, CO Colorado Springs

1 Mile5K10K +7

From $22 Open Closing Soon 5 spots left

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Candy Cane Course - Denver

Sun, Dec 6 · Westminster, CO Westminster

1 Mile5K10K +7

From $22 Open Closing Soon 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

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

Sat, Jan 30 · Westminster, CO Westminster

1 Mile5K10K +4

From $15 Open 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 5 spots left

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Old Man Winter Bike Rally & Run

Sun, Feb 7 · Lyons, CO Lyons

5K run10k Run50K Ride +2

Closed

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The Grand Traverse

Sun, Mar 28 · Crested Butte, CO Crested Butte

BikeSkiRun +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 (Relay) +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 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 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

4M Trail Races4 Mile8 Mile +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 walk or run (4.3 miles)7K Ruck (4.3 Miles)7k walk or run (4.3 miles) +23

From $35 Open

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M1LE Nation Challenge

Fri, Jun 11 · Fort Collins, CO Fort Collins

M1LE NationTeam 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 Mile5 K +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 - 12 person team (7-12 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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2027 Lake Nighthorse Triathlon - Sprint and Olympic

Sat, Sep 11 · Durango, CO Durango

Sprint Relay - MaleSprint Relay - MaleSprint Relay - Coed +7

From $85 Closed 9 spots left

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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 Closed

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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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