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Trail Running Calendar near Denver 2026-2027

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Explore the top trail runs near Denver for 2026-2027! We've gathered 32 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.

Trail Running Calendar United States
October 2026
Oct
17
Sa

The Great Trailhead Foot Race 10 Miler

Trail Run 5 mi 10 mi
Experience single track trails and dirt paths at Bear Creek Lake Park with views of the Denver skyline. Enjoy a post race party with food and beverages included in your registration for both the 5 and 10 mile distances.
Oct
17
Sa

Trail Apples

Trail Run 4 mi 8 mi 12 mi
Oct
24-25
Sa - Su

The Barnyard Backyard Ultra

Backyard Ultra 7 km
A backyard ultra at Luvin Arms Animal Sanctuary on Oct 24–25, 2026 with hourly 4.167-mile loops on mostly flat dirt, grass, and gravel plus on-site race camp and cupless aid.
Oct
25
Su

Beware The Bear Trail Races

Trail Run 5 km 15 km 20 km
Trail races at Bear Creek Lake Park on Oct 25 2026 featuring 5 km, 15 km, a 5+15 double and a Kids 1 km. Mostly dirt single and double track with steep climbs, marked courses and included postrace items for adult distances.
Oct
25
Su

Monsterdash - Louisville

Trail Run 5 km 10 km Half Marathon
MonsterDASH Louisville on Oct 25, 2026 offers a new half marathon plus 5k, 10k and a kids mile with costume contests, expo, and themed runner perks.
Oct
31
Sa

Eerie Erie

Road Race Trail Run 5 km 10 km
A Halloween themed 5k and 10k through historic downtown Erie and Coal Creek trails, with a kids Goblin Run and BOLDERBoulder qualifier status. The event supports the Erie Optimist Club as its primary fundraiser.
November 2026
Nov
7
Sa

HRCA Backcountry Wilderness Half Marathon

Trail Run 13 mi
Experience 13.1 miles of singletrack trails and hills in the Highlands Ranch Backcountry Wilderness Area. Enjoy custom medals and a post race pancake breakfast while competing for cash prizes in various categories.
Nov
14
Sa

Louisville Trail Race

Trail Run 5 km 10 km 13 mi
Trail races in Louisville, Colorado on November 14, 2026 offering Half Marathon, 10K and 5K on out-and-back dirt trails with aid stations and limited onsite parking.
December 2026
Dec
5
Sa

Sawmill Trail Runs

Trail Run 50 km
Dec
5
Sa

Kingfisher Half Marathon

Trail Run 5 km 10 km Half Marathon
Dec
12
Sa

Santa Claus Run

Trail Run 5 km 10 km Half Marathon
Holiday trail runs in Louisville CO with 5k, 10k, a new half marathon, expo pickup, giveaways, family activities, and a visit from Santa.
January 2027
Jan
24
Su

Freakin Freezin 5K - Denver

Trail Run 5 km
Freakin Freezin 5K in Denver on January 24, 2027 offers in-person and virtual 5K options with finisher medals and multiple overall and age-group awards.
March 2027
Mar
20
Sa

Far Out 3/4 Marathon

Trail Run 5 km 10 mi 32 km
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