Colorado Marathon Calendar 2025-2026

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Explore the best marathons in Colorado for 2025-2026! Our updated list features 29 exciting races across the state. Find your next race in Colorado below and join the running community at these great events!

March 2025
Mar
8
Saturday

Winter's End Snowshoe Races

Trail Run 2 mi 8 mi 16 mi 26 mi
Mar
8
Saturday

Run Through Time Trail Marathon

Trail Run 2 mi 13 mi 26 mi
April 2025
Apr
26
Saturday

Runs With Scissors Races

13 mi 26 mi 50 km
May 2025
May
3
Saturday

Falcon 50 - Colorado Springs

Trail Run 21 km 42 km 50 mi
May
4
Sunday

Colorado Marathon

5 km 10 km 13 mi 26 mi
May
10
Saturday

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... 26 mi 50 km
May
17-18
Sa - Su

Denver Colfax Marathon

5 km 10 mi 13 mi 26 mi
May
25
Sunday

Spirit Trail Run

Trail Run 9 km 21 km 42 km
June 2025
Jun
1
Sunday

Steamboat Marathon

10 km 13 mi 26 mi
Jun
15
Sunday

Estes Park Marathon and Half Marathon

5 mi 13 mi 26 mi
Jun
28
Saturday

Leadville Trail Marathon and Heavy Half

Trail Run 15 mi 26 mi
July 2025
Jul
19
Saturday

Silverton Alpine Marathons

Trail Run 8 mi 26 mi 50 km
Jul
19
Saturday

Aspen Valley Marathon

5 km 13 mi 26 mi
August 2025
Aug
2
Saturday

Boulder Rez Marathon

Trail Run 10 km 13 mi 31 km 26 mi
Aug
2-3
Sa - Su

Emerald Mountain Epic

Trail Run 10 km 21 km 42 km 52 mi
Aug
3
Sunday

Bound for Boston Marathon - Denver

13 mi 26 mi
Aug
16
Saturday

Mt. Sneffels Marathon

10 km 13 mi 26 mi
Aug
23
Saturday

Staunton Rocks

Trail Run 13 mi 26 mi
September 2025
Sep
5-6
Fr - Sa

American Heroes Run

Trail Run 5 km 9 mi ... 100 mi 24 hr
Sep
14
Sunday

Fall Equinox Marathon

5 mi 13 mi 26 mi
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