Upcoming 5K Races in Thornton, CO 2026-2027

Evergreen Trail Race Series

Evergreen, CO

Saturday, May 30th, 2026

Featured

5K

Trail

View details for race Evergreen Trail Race Series

Want to feature your race?

Get your race seen first by thousands of runners

Feature My Race

Learn how to feature your race

Don't see your race?

Add it for free — it only takes a minute

Add Race (Free)

Add your race for free

Dash4Hope 2026

Greeley, CO

Saturday, May 30th, 2026

5K

View details for race Dash4Hope 2026

J-Town Jog 5K and Jr 1 Mile Dash

Johnstown, CO

Saturday, June 6th, 2026

1 Mile

5K

View details for race J-Town Jog 5K and Jr 1 Mile Dash

StepUp For Women And Recovery

Fort Collins, CO

Saturday, June 6th, 2026

5K

View details for race StepUp For Women And Recovery

Berthoud Day 5K

Berthoud, CO

Saturday, June 6th, 2026

5K

View details for race Berthoud Day 5K

The Big Run Presented by Brooks

Denver, CO

Sunday, June 7th, 2026

5K

View details for race The Big Run Presented by Brooks

Colorado 13er (Half Marathon/10k/5k)

Louisville, CO

Sunday, June 7th, 2026

Half

10K

5K

Trail

View details for race Colorado 13er (Half Marathon/10k/5k)

Flamingo Day 5K

Denver, CO

Sunday, June 7th, 2026

5K

View details for race Flamingo Day 5K

Sweat & Snack Community Run + OutsideTV Series ...

Boulder, CO

Tuesday, June 9th, 2026

5K

View details for race Sweat & Snack Community Run + OutsideTV Series Premier

All-Out Summer Breeze

Arvada, CO

Saturday, June 13th, 2026

Half

10K

5K

Trail

View details for race All-Out Summer Breeze

Stepping Stone 5K

Littleton, CO

Saturday, June 13th, 2026

5K

View details for race Stepping Stone 5K

Holy Hammers Hustle for Habitat

Parker, CO

Saturday, June 13th, 2026

5K

View details for race Holy Hammers Hustle for Habitat

Treat Trot Denver

Denver, CO

Saturday, June 13th, 2026

5K

10K

15K

View details for race Treat Trot Denver

Treat Trot - Denver

Thornton, CO

Saturday, June 13th, 2026

5K

10K

15K

View details for race Treat Trot - Denver

Tutu Dash 5K

Broomfield, CO

Saturday, June 13th, 2026

5K

1 Mile

Trail

View details for race Tutu Dash 5K

The Bullfrog Splashdown

Littleton, CO

Sunday, June 14th, 2026

10K

5K

1 Mile

View details for race The Bullfrog Splashdown

Red, White and Brew 5k, 10k, Half Marathon & 12...

Windsor, CO

Saturday, June 20th, 2026

5K

10K

Half

View details for race Red, White and Brew 5k, 10k, Half Marathon & 12 Hour Last Person Standing

Unicorn 5k (North)

Thornton, CO

Saturday, June 20th, 2026

5K

View details for race Unicorn 5k (North)

Parker Parks and Recreation Dash Across the Dam...

Parker, CO

Saturday, June 20th, 2026

5K

View details for race Parker Parks and Recreation Dash Across the Dam Father’s Day 5K

Sierra's 5K Run/Walk Race Against Meningitis

Loveland, CO

Saturday, June 20th, 2026

5K

View details for race Sierra's 5K Run/Walk Race Against Meningitis

Muddy Dash | Denver 2026

Dacono, CO

Saturday, June 20th, 2026

5K

View details for race Muddy Dash | Denver 2026

Juneteenth Fun Run 5K

Denver, CO

Sunday, June 21st, 2026

5K

View details for race Juneteenth Fun Run 5K

14th Annual Buffs4Life Kyle MacIntosh Memorial ...

Boulder, CO

Sunday, June 21st, 2026

5K

View details for race 14th Annual Buffs4Life Kyle MacIntosh Memorial 5K Run/Walk

Father's Day Classic 10k, 5k, & 1 Mile

Arvada, CO

Sunday, June 21st, 2026

10K

5K

1 Mile

View details for race Father's Day Classic 10k, 5k, & 1 Mile

Sunset Trail Running Festival

Boulder, CO

Sunday, June 21st, 2026

12K

5K

Trail

View details for race Sunset Trail Running Festival

The Red Schoolhouse Run

Louisville, CO

Tuesday, June 23rd, 2026

5K

View details for race The Red Schoolhouse Run

The Four Legged 5k

Bailey, CO

Friday, June 26th, 2026

5K

View details for race The Four Legged 5k

Before The Fourth 5k

Littleton, CO

Saturday, June 27th, 2026

5K

View details for race Before The Fourth 5k

Denver Pride 5K

Denver, CO

Saturday, June 27th, 2026

5K

View details for race Denver Pride 5K

Fitness Expo On Tap at the Colorado Tap House

Arvada, CO

Saturday, June 27th, 2026

5K

1 Mile

View details for race Fitness Expo On Tap at the Colorado Tap House

Firework Color Run

Berthoud, CO

Saturday, June 27th, 2026

5K

1 Mile

View details for race Firework Color Run

FireKracker 5k

Fort Collins, CO

Saturday, July 4th, 2026

5K

1 Mile

View details for race FireKracker 5k

HRCA Independence Day 5K

Littleton, CO

Saturday, July 4th, 2026

5K

View details for race HRCA Independence Day 5K

Greeley Freedom 5k Walk & Run

Greeley, CO

Saturday, July 4th, 2026

5K

View details for race Greeley Freedom 5k Walk & Run

Let Freedom Run 5k/10k - Louisville

Louisville, CO

Saturday, July 4th, 2026

5K

10K

View details for race Let Freedom Run 5k/10k - Louisville

Loveland Liberty 5K

Loveland, CO

Saturday, July 4th, 2026

5K

View details for race Loveland Liberty 5K

Let Freedom Run 5k - LONGMONT

Longmont, CO

Saturday, July 4th, 2026

5K

View details for race Let Freedom Run 5k - LONGMONT

BRR All-Comers Summer Track & Field Series #3

Boulder, CO

Thursday, July 9th, 2026

1 Mile

5K

View details for race BRR All-Comers Summer Track & Field Series #3

DRMABPsi 1–5K Walk, Run & Roll

Denver, CO

Saturday, July 11th, 2026

5K

View details for race DRMABPsi 1–5K Walk, Run & Roll

Cookie Chase

Denver, CO

Saturday, July 11th, 2026

5K

Fast

View details for race Cookie Chase

All-Out Dog Days

Westminster, CO

Saturday, July 11th, 2026

Half

10K

5K

Trail

View details for race All-Out Dog Days

Heatwave Half Marathon - Denver

Denver, CO

Saturday, July 11th, 2026

1 Mile

5K

10K

View details for race Heatwave Half Marathon - Denver

Heatwave Half Marathon - Denver

Littleton, CO

Saturday, July 11th, 2026

1 Mile

5K

10K

View details for race Heatwave Half Marathon - Denver

Diplo's Run Club Denver

Denver, CO

Sunday, July 12th, 2026

Code:FTR10

5K

View details for race Diplo's Run Club Denver

Heritage Eagles 5K

Littleton, CO

Saturday, July 18th, 2026

5K

Fast

View details for race Heritage Eagles 5K

CU Anschutz Run Club 5K

Aurora, CO

Saturday, July 18th, 2026

5K

View details for race CU Anschutz Run Club 5K

Summer Splash Prairie Dog Half, 10k, & 5k

Castle Rock, CO

Saturday, July 18th, 2026

Half

10K

5K

Trail

View details for race Summer Splash Prairie Dog Half, 10k, & 5k

One Is Too Many: Veteran Suicide Awareness 5k a...

Greeley, CO

Sunday, July 19th, 2026

5K

1 Mile

View details for race One Is Too Many: Veteran Suicide Awareness 5k and Kids Run

Flyin' Ryan Memorial 5k

Loveland, CO

Friday, July 24th, 2026

5K

Fast

View details for race Flyin' Ryan Memorial 5k

The Hero's Journey 5K

Aurora, CO

Saturday, July 25th, 2026

5K

Trail

View details for race The Hero's Journey 5K

Upcoming 5K Races Near Thornton, CO