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Colorado Marathon Calendar 2026-2027

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Monthly updates for Colorado

Get new running races (and updates) in your inbox every month.

Explore the best marathons in Colorado for 2026-2027! Our updated list features 29 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

April 2026
Apr
25
Sa

Runs With Scissors Races

13 mi 26 mi 50 km
Apr
25
Sa

Falcon 50 - Colorado Springs

Trail Run 13 mi 26 mi 50 mi
May 2026
May
3
Su

Colorado Marathon

5 km 10 km 13 mi 26 mi
May
9
Sa

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... Marathon 50 km
May
24
Su

Spirit Trail Run

Trail Run 9 km Half Marathon Marathon
May
30-31
Sa - Su

Weld Your Mettle Running Festival

Backyard Ultra 7 km 14 mi ... 100 km 100 mi
June 2026
Jun
7
Su

Steamboat Marathon

10 km 13 mi 26 mi
Jun
20-21
Sa - Su

Estes Park Marathon

5 km 5 mi Half Marathon Marathon
Jun
27
Sa

Leadville Trail Marathon and Heavy Half

Trail Run 15 mi 26 mi
July 2026
Jul
25
Sa

Aspen Valley Marathon

5 km Half Marathon Marathon
August 2026
Aug
1
Sa

Aspen Backcountry Marathon

Trail Run 15 mi 26 mi 50 km
Aug
2
Su

Bound for Boston Marathon - Denver

13 mi 26 mi
Aug
8-9
Sa - Su

Emerald Mountain Epic

Trail Run 13 mi 26 mi
Aug
15
Sa

Boulder Rez Marathon

Trail Run 10 km 13 mi 20 mi 26 mi
Aug
22
Sa

Staunton Rocks

Trail Run 13 mi 26 mi
September 2026
Sep
11-12
Fr - Sa

American Heroes Run

Trail Run 5 km 9 mi ... 551 min 100 mi
Sep
12
Sa

Steele Trap Trail Run

Trail Run 13 mi 26 mi 50 mi
Sep
20
Su

Pikes Peak Marathon

Trail Run 26 mi
Sep-Oct
20-3
Su - Sa

Fall Equinox Marathon

5 mi 13 mi 26 mi
Sep
27
Su

Run Boulderthon: The Boulder Marathon

5 km 10 km Half Marathon Marathon
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