5K races near Boulder, Colorado — 2026 running calendar

Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado

Boulder, Colorado, United States

Sep 27, 2026 (Sun)

$40.00 - $500.00

Running

Half-Marathon 5K 10K

Alpine Bank Boulder Thanksgiving Day 5K

Boulder, Colorado, United States

Nov 26, 2026 (Thu)

$15.00 - $35.00

Running

5K Ultra

Hands & Voices New Year Virtual 5K: Trails to the Summit

Boulder, Colorado, United States

Dec 31, 2026 (Thu) – Jan 3, 2027

$25.00

Running

5K

BRR All-Comers Summer Track & Field Series #3

Boulder, Colorado, United States

Jul 9, 2026 (Thu)

Running

Ultra 1.6K 5K +1

Virtual 14th Annual Buffs4Life Kyle MacIntosh Memorial 5K Run/Walk

Boulder, Colorado, United States

Jun 21, 2026 (Sun)

Running

5K

14th Annual Buffs4Life Kyle MacIntosh Memorial 5K Run/Walk

Boulder, Colorado, United States

Jun 21, 2026 (Sun)

Running

5K

Run for the River 5k Boulder

Boulder, Colorado, United States

Jun 20, 2026 (Sat)

Running

5K

Emerge 5K

Boulder, Colorado, United States

May 3, 2026 (Sun)

Running

5K

2026 Dash & Dine 5k Run Series

Boulder, Colorado, United States

Apr 28, 2026 (Tue) – May 19, 2026

Running

5K