Running Race Calendar in Colorado, United States

Endure Trail Runs

Divide, Colorado, United States

16 May, 2026 (Sat)

Running, Trail running

11K 22.7K Marathon

Growing Home - Colfax Fundraiser

Denver, Colorado, United States

16 May, 2026 (Sat) – 17 May, 2026

Running

5K

Black Canyon Ascent

Montrose, Colorado, United States

16 May, 2026 (Sat)

Running, Walking

9.7K

Vallecito Lake Heavy Half

Bayfield, Colorado, United States

16 May, 2026 (Sat)

Running

22.5K

Know. Grow. GO RUN. 5K

Loveland, Colorado, United States

15 May, 2026 (Fri)

Running

5K

Super Mom 5K/10K/Half - Colorado Springs

Colorado Springs, Colorado, United States

10 May, 2026 (Sun)

Running

5K 10K Half-Marathon +5

Denver Mother's Day 5K

Denver, Colorado, United States

10 May, 2026 (Sun)

Running

5K

Hometown Half Marathon & 5k/10k - Denver

Littleton, Colorado, United States

10 May, 2026 (Sun)

Running

1.6K 5K 10K Half-Marathon +1

Colorado Women's Classic - Westminster

Westminster, Colorado, United States

10 May, 2026 (Sun)

Running

5K 10K 16.1K

2026 Mother's Day Virtual 5k - Colorado Springs

Colorado Springs, Colorado, United States

09 May, 2026 (Sat) – 11 May, 2026

Running

5K

2026 Mother's Day Virtual 5k - Westminster

Westminster, Colorado, United States

09 May, 2026 (Sat) – 11 May, 2026

Running

5K

Cherry Creek Race for the Watershed 2026

Aurora, Colorado, United States

09 May, 2026 (Sat)

Running

5K