10K races in Colorado, United States — 2026 running calendar

Autumn Run

Buena Vista, Colorado, United States

19 Sep, 2026 (Sat)

Free - $90.00

Running

Half-Marathon 10K 5K 1K

Beulah Challenge and OverIt Series

Beulah, Colorado, United States

19 Sep, 2026 (Sat)

$20.00 - $180.00

Running

Half-Marathon 10K 5K +2

Chile & Frijole Hot to Trot 5K & 10K

Pueblo, Colorado, United States

20 Sep, 2026 (Sun)

$35.00 - $40.00

Running

5K 10K

20th Annual Golden Gallop

Golden, Colorado, United States

20 Sep, 2026 (Sun)

$45.00 - $50.00

Running

5K 10K 20K

Parker Parks and Recreation So Long to Summer 5K/10K

Parker, Colorado, United States

26 Sep, 2026 (Sat)

$40.00 - $50.00

Running

5K 10K

Oktoberfest Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

26 Sep, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

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

Boulder, Colorado, United States

27 Sep, 2026 (Sun)

$40.00 - $500.00

Running

Half-Marathon 5K 10K

Lafayette Music Fest -5K - 10K

Lafayette, Colorado, United States

03 Oct, 2026 (Sat)

$45.00 - $65.00

Running

10K 5K

Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half Marathon

Canon City, Colorado, United States

03 Oct, 2026 (Sat)

$40.00 - $80.00

Running

5K 12.9K Half-Marathon 10K +2

Spooky Sprint - Denver

Littleton, Colorado, United States

03 Oct, 2026 (Sat)

$25.00 - $61.00

Running

1.6K 5K 10K Half-Marathon

Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run

Windsor, Colorado, United States

04 Oct, 2026 (Sun)

$20.00 - $115.00

Running

Marathon Half-Marathon 10K 5K +1

Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

10 Oct, 2026 (Sat) – 28 Nov, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8