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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 17 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

January 2027
Jan
30-31
Sa - Su

The Alley Loop

Trail Run 5 km 6 km ... Half Marathon Marathon
March 2027
Mar
13
Sa

Run Through Time Trail Marathon

Trail Run 2 mi 13 mi 26 mi
April 2027
Apr
10
Sa

Latino Ultra Nature Adventure

Trail Run 5 km 7 mi 15 mi 26 mi
May 2027
May
2
Su

Colorado Marathon

5 km 10 km 13 mi 26 mi
May
8
Sa

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... Marathon 50 km
Monthly updates for Colorado

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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 7 km 14 mi ... 100 km 100 mi
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
19-20
Sa - Su

Estes Park Marathon

Road Race Trail Run 5 mi 8 mi Half Marathon Marathon
Jun
26
Sa

Leadville Trail Marathon and Heavy Half

Trail Run 16 mi 26 mi
August 2027
Aug
1
Su

Bound for Boston Marathon - Denver

13 mi 26 mi
Aug
1
Su

Aspen Backcountry Marathon

Trail Run 15 mi Marathon 50 km
September 2027
Sep
19
Su

Pikes Peak Marathon

Trail Run 26 mi
Sep
26
Su

Run Boulderthon: The Boulder Marathon

5 km 10 km 13 mi 26 mi
October 2027
Oct
2
Sa

Colorado Springs Marathon

5 km 13 mi 26 mi
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