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Half Marathon Calendar near Longmont 2025-2026

Explore the top half marathons near Longmont for 2025-2026! We've gathered 28 exciting races in the area. Check out our detailed list below to find your next local race.

June 2025
Jun
1
Sunday

Colorado 13er Half Marathon

5 km 10 km 13 mi
Jun
7
Saturday

All-Out Summer Breeze

5 km 10 km 13 mi
Jun
14
Saturday

Barr Lake Trail Race

Trail Run 5 km 15 km ... 30 km 50 km
Jun
14
Saturday

Estes Park Marathon

5 mi 13 mi 26 mi
Jun
21
Saturday

Hometown Half Marathon - Denver

5 km 10 km 13 mi
Jun
21
Saturday

Red, White and Brew Half Marathon

5 km 10 km 13 mi 12 hr
July 2025
Jul
12
Saturday

All-Out Dog Days

5 km 10 km 13 mi
August 2025
Aug
1-2
Fr - Sa

Rocky Mountain Half Marathon

5 km 13 mi
Aug
2
Saturday

All-Out Runapalooza

5 km 10 km 13 mi
Aug
2
Saturday

Boulder Rez Marathon

Trail Run 10 km 13 mi 31 km 26 mi
Aug
8-9
Fr - Sa

Choice City Running Festival

5 km 10 km 13 mi
Aug
17
Sunday

Erie Half

5 km 13 mi
Aug
23
Saturday

Westminster Night Trail

Trail Run 5 km 10 km ... 35 km 50 km
September 2025
Sep
5-6
Fr - Sa

American Heroes Run

Trail Run 5 km 9 mi ... 100 mi 24 hr
Sep
13
Saturday

All-Out Fall Fest

5 km 10 km 13 mi
Sep
13
Saturday

Ned Ned Half Marathon

Trail Run 5 km 10 km 13 mi
Sep
14
Sunday

Fall Equinox Marathon

5 mi 13 mi 26 mi
Sep
27
Saturday

Pioneer Prairie Dog Half

5 km 10 km 13 mi
Sep
28
Sunday

Run Boulderthon: The Boulder Marathon

5 km 10 km 13 mi 26 mi
October 2025
Oct
5
Sunday

Windsor Marathon

5 km 10 km 13 mi 26 mi
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