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Colorado Marathon Calendar 2026-2027

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Explore the best marathons in Colorado for 2026-2027! Our updated list features 22 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

October 2026
Oct
3
Sa

Colorado Springs Marathon

5 km 13 mi 26 mi
Oct
3
Sa

West Elk Challenge

Trail Run 3 mi 30 km 26 mi
Oct
3
Sa

Bataan Death March Colorado

Road Race Trail Run 13 mi 26 mi
Oct
4
Su

Windsor Marathon

5 km 10 km Half Marathon Marathon
Oct
10
Sa

The Long View Marathon

5 km 13 mi 26 mi
Monthly updates for Colorado

Get new running races (and updates) in your inbox every month.
Oct
10-11
Sa - Su

Breckenridge RunFest

5 km 10 km Half Marathon Marathon
Oct
11
Su

Durango Marathon

5 km 13 mi 26 mi
November 2026
Nov
1
Su

Rim Rock Marathon & Half Marathon

13 mi 26 mi
January 2027
Jan
30
Sa

The Alley Loop

Trail Run 3 km 5 km ... Half Marathon Marathon
March 2027
Mar
13
Sa

Run Through Time Trail Marathon

Trail Run 2 mi 13 mi 26 mi
May 2027
May
2
Su

Colorado Marathon

5 km 10 km Half Marathon Marathon
May
8
Sa

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... Marathon 50 km
May
22
Sa

Denver Colfax Marathon

Marathon
May
30
Su

Spirit Trail Run

Trail Run 9 km Half Marathon Marathon
June 2027
Jun
5-6
Sa - Su

Weld Your Mettle Running Festival

Backyard Ultra 4 mi 14 mi ... 100 mi 36 hr
Jun
6
Su

Steamboat Marathon

10 km 13 mi 26 mi
Jun
12
Sa

Summits Trail Runs

Trail Run Backyard Ultra 6 mi Half Marathon Marathon 50 km
Jun
19
Sa

Estes Park Marathon

Road Race Trail Run 5 mi 8 mi 13 mi 26 mi
Jun
26
Sa

Leadville Trail Marathon and Heavy Half

Trail Run 15 mi 26 mi
August 2027
Aug
1
Su

Bound for Boston Marathon - Denver

13 mi 26 mi
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