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Half Marathon Calendar near Longmont 2025-2026

Explore the top half marathons near Longmont for 2025-2026! We've gathered 27 exciting races in the area. Check out our detailed list below to find your next local race.

June 2026
Jun
20
Saturday

Red, White and Brew Half Marathon

5 km 10 km Half Marathon 12 hr
July 2026
Jul
11
Saturday

All-Out Dog Days

5 km 10 km Half Marathon
Jul - Aug
31-1
Fr - Sa

Rocky Mountain Half Marathon

5 km Half Marathon
August 2026
Aug
16
Sunday

Erie Half

5 km Half Marathon
September 2026
Sep
12
Saturday

Ned Ned Run

Trail Run 5 km 6 mi 13 mi
Sep
19
Saturday

All-Out Fall Fest

5 km 10 km Half Marathon
Sep
27
Sunday

Run Boulderthon: The Boulder Marathon

5 km 10 km Half Marathon Marathon
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