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Half Marathon Calendar near Boulder 2026-2027

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Explore the top half marathons near Boulder for 2026-2027! We've gathered 33 exciting races in the area. Check out our detailed list below to find your next local race.

December 2026
Dec
5
Sa

All-Out Fa La La

5 km 10 km 13 mi
Dec-Mar
6-7
Su

RunDenver Series

Road Race 5 km 4 mi 10 km 13 mi
Dec
12
Sa

Santa Claus Run

Trail Run 5 km 10 km Half Marathon
January 2027
Jan
9
Sa

Polar Prowl

5 km 10 km 13 mi
February 2027
Feb
6
Sa

Mardi Crawl

5 km 10 km 13 mi
Monthly updates for Boulder

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March 2027
Mar
7
Su

That Dam Run Half Marathon

5 km 10 km 13 mi
Mar
21
Su

All-Out Spring Fever

5 km 10 km 13 mi
April 2027
Apr
24
Sa

All-Out Beat the Heat

5 km 10 km 13 mi
Apr
24
Sa

NoCo Half Marathon & 10K

6 mi 13 mi
June 2027
Jun
6
Su

Colorado 13er Half Marathon

5 km 10 km 13 mi
Jun
12
Sa

All-Out Summer Breeze

5 km 10 km 13 mi
Jun
19-20
Sa - Su

Estes Park Marathon

5 km 5 mi ... Half Marathon Marathon
August 2027
Aug
6-7
Fr - Sa

Rocky Mountain Half Marathon

5 km 13 mi
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