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Half Marathon Calendar near Denver 2025-2026

Monthly updates for Denver

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

Explore the top half marathons near Denver for 2025-2026! We've gathered 48 exciting races in the area. Check out our detailed list below to find your next local race.

December 2025
Dec
27
Sa

The Best Races - Centennial

5 km 10 km 13 mi
January 2026
Jan
3
Sa

The Best Races - Centennial

5 km 10 km 13 mi
Jan
10
Sa

Polar Prowl

3 mi 6 mi 13 mi
Jan
17
Sa

The Best Races - Centennial

5 km 10 km 13 mi
February 2026
Feb
7
Sa

The Best Races - Centennial

5 km 10 km 13 mi
Feb
14
Sa

The Best Races - Centennial

5 km 10 km 13 mi
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
1
Su

That Dam Run Half Marathon

5 km 10 km 13 mi
Mar
7
Sa

The Best Races - Centennial

5 km 10 km 13 mi
Mar
14
Sa

The Best Races - Centennial

5 km 10 km 13 mi
Mar
22
Su

All-Out Spring Fever

5 km 10 km Half Marathon
April 2026
Apr
4
Sa

The Best Races - Centennial

5 km 10 km 13 mi
Apr
5
Su

Three Creeks Half Marathon

13 mi
Apr
11
Sa

Mountain Ridge Trail Race

Trail Run 3 mi 6 mi 13 mi 22 mi
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
Apr
25
Sa

Runs With Scissors Races

Half Marathon Marathon 50 km