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Half Marathon Calendar near Idaho Springs 2025-2026

Monthly updates for Idaho Springs

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

Explore the top half marathons near Idaho Springs for 2025-2026! We've gathered 24 exciting races in the area. Check out our detailed list below to find your next local race.

January 2026
Jan
10
Sa

Polar Prowl

3 mi 6 mi 13 mi
February 2026
Feb
15
Su

Ralston Creek Half Marathon

5 km Half Marathon
Feb
22
Su

Mardi Crawl

5 km 10 km Half Marathon
March 2026
Mar
22
Su

All-Out Spring Fever

5 km 10 km Half Marathon
April 2026
Apr
11
Sa

Boulder Rez Half

5 km 10 km Half Marathon
Apr
12
Su

Platte River Half-Marathon

5 km Half Marathon
Apr
12
Su

Spring Fling Prairie Dog Half Marathon

5 km 10 km Half Marathon
Apr
18
Sa

All-Out Beat the Heat

5 km 10 km Half Marathon
May 2026
May
17
Su

Denver Colfax Marathon

10 mi Half Marathon Marathon
June 2026
Jun
7
Su

Colorado 13er Half Marathon

3 mi 6 mi 13 mi
Jun
13
Sa

All-Out Summer Breeze

5 km 10 km Half Marathon
July 2026
Jul
11
Sa

All-Out Dog Days

5 km 10 km Half Marathon
August 2026
Aug
8
Sa

All-Out Runapalooza

5 km 10 km Half Marathon
Aug
22
Sa

Byers Peak Stampede Half Marathon

Trail Run 5 km Half Marathon
Aug
22
Sa

Staunton Rocks

Trail Run 13 mi 26 mi
Aug
23
Su

Pioneer Prairie Dog Half

5 km 10 km Half Marathon
September 2026
Sep
12
Sa

Ned Ned Run

Trail Run 5 km 10 km 13 mi
Sep
19
Sa

All-Out Fall Fest

5 km 10 km Half Marathon
Sep
27
Su

Run Boulderthon: The Boulder Marathon

5 km 10 km Half Marathon Marathon
October 2026
Oct
3-4
Sa - Su

The Bear Chase

Trail Run 5 km 10 km ... 50 mi 100 km