Running Race Calendar in Colorado, United States

Mitchell Mile

Golden, Colorado, United States

May 8, 2026 (Fri)

Running

1.6K

Water Wells for Africa 5k Walk/Run

Silt, Colorado, United States

May 3, 2026 (Sun)

Running

5K

Emerge 5K

Boulder, Colorado, United States

May 3, 2026 (Sun)

Running

5K

2026 Altitude Elementary Moose Mudder

Aurora, Colorado, United States

May 3, 2026 (Sun)

Running

1K 5K

Hayden Cog Run

Hayden, Colorado, United States

May 3, 2026 (Sun)

Running

13.5K 5K

RMRR May Trophy Series

Denver, Colorado, United States

May 3, 2026 (Sun)

Running

8K 5K

Longmont Half & 5k (LM Half)

Longmont, Colorado, United States

May 3, 2026 (Sun)

Running

Half-Marathon 5K

Frank Shorter Track Classic

Longmont, Colorado, United States

May 3, 2026 (Sun)

Running

1.6K

MayFest Fun Run

Parachute, Colorado, United States

May 2, 2026 (Sat)

Running

5.5K

CollaBEERation 5k & Brew Fest Party

Longmont, Colorado, United States

May 2, 2026 (Sat)

Running

5K

High Line Canal 5K/10K Run

Centennial, Colorado, United States

May 2, 2026 (Sat)

Running

10K 5K

Sunrise Marathon 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

May 2, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2