5K races near Boulder, Colorado — 2026 running calendar

Sep

27

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

Boulder, Colorado, United States

$40.00 - $500.00

Running

Half-Marathon 5K 10K

Nov

26

Alpine Bank Boulder Thanksgiving Day 5K

Boulder, Colorado, United States

$20.00 - $40.00

Running

5K Ultra

Dec

31

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

Boulder, Colorado, United States

$30.00

Running

5K

May

02

Emerge 5K

Boulder, Colorado, United States

Free

Running

5K

Jun

12

Alpha 5K Challenge

Boulder, Colorado, United States

Running

5K

Jul

09

BRR All-Comers Summer Track & Field Series #3

Boulder, Colorado, United States

Running

Ultra 1.6K 5K +1

Jun

21

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

Boulder, Colorado, United States

Running

5K

Jun

21

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

Boulder, Colorado, United States

Running

5K

Jun

20

Run for the River 5k Boulder

Boulder, Colorado, United States

Running

5K

Apr

28

2026 Dash & Dine 5k Run Series

Boulder, Colorado, United States

Running

5K