Upcoming 5K Races Near Castle Rock, CO

Name: Before The Fourth 5k
Start: 2026-06-27
End: 2026-06-27
Location: Littleton

Friends of the National Center Science Stride 5K

Boulder, CO

Friday, May 1st, 2026

Featured

View details for race Friends of the National Center Science Stride 5K

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Adams County Foster Care 5K Run/Walk and 1 mile...

Brighton, CO

Saturday, May 2nd, 2026

1 Mile

View details for race Adams County Foster Care 5K Run/Walk and 1 mile fun run

High Line Canal 5K/10K Run

Centennial, CO

Saturday, May 2nd, 2026

10K

View details for race High Line Canal 5K/10K Run

RMRR May Trophy Series

Denver, CO

Sunday, May 3rd, 2026

Fast

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Rise Against Suicide’s Emerge 5K

Boulder, CO

Sunday, May 3rd, 2026

View details for race Rise Against Suicide’s Emerge 5K

2026 Altitude Elementary Moose Mudder

Aurora, CO

Sunday, May 3rd, 2026

View details for race 2026 Altitude Elementary Moose Mudder

Dash & Dine 5k #2

Boulder, CO

Tuesday, May 5th, 2026

View details for race Dash & Dine 5k #2

Hometown Half Marathon & 5k/10k - Colorado Springs

Colorado Springs, CO

Saturday, May 9th, 2026

10K

Half

View details for race Hometown Half Marathon & 5k/10k - Colorado Springs

2026 Five Star 5K, Mile of Smiles, and Wellness...

Brighton, CO

Saturday, May 9th, 2026

1 Mile

View details for race 2026 Five Star 5K, Mile of Smiles, and Wellness Festival

Women's Distance Festival 5K

Colorado Springs, CO

Saturday, May 9th, 2026

View details for race Women's Distance Festival 5K

HRCA Mother's Day 5K

Highlands Ranch, CO

Saturday, May 9th, 2026

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Kadet Football 5K

Colorado Springs, CO

Saturday, May 9th, 2026

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Parker Parks and Recreation Miles over the Mead...

Parker, CO

Saturday, May 9th, 2026

1 Mile

View details for race Parker Parks and Recreation Miles over the Meadow Mother’s Day 5K & Family Fun Trek

Cherry Creek Race for the Watershed 2026

Aurora, CO

Saturday, May 9th, 2026

View details for race Cherry Creek Race for the Watershed 2026

Denver Mother's Day 5K

Denver, CO

Sunday, May 10th, 2026

View details for race Denver Mother's Day 5K

Hometown Half Marathon & 5k/10k - Denver

Denver, CO

Sunday, May 10th, 2026

10K

Half

View details for race Hometown Half Marathon & 5k/10k - Denver

Super Mom 5K/10K/Half - Colorado Springs

Colorado Springs, CO

Sunday, May 10th, 2026

10K

Half

View details for race Super Mom 5K/10K/Half - Colorado Springs

Hometown Half Marathon & 5k/10k - Denver

Littleton, CO

Sunday, May 10th, 2026

1 Mile

10K

View details for race Hometown Half Marathon & 5k/10k - Denver

Colorado Women's Classic - Westminster

Westminster, CO

Sunday, May 10th, 2026

10K

10 Miles

View details for race Colorado Women's Classic - Westminster

Girls on the Run 5K at Colfax - Running Buddies...

Denver, CO

Saturday, May 16th, 2026

View details for race Girls on the Run 5K at Colfax - Running Buddies and Volunteers

Gluten Free Gallop 5K

Littleton, CO

Saturday, May 16th, 2026

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Canine On the Creek

Dumont, CO

Sunday, May 17th, 2026

1 Mile

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Miles for Smiles 5K

Arvada, CO

Sunday, May 17th, 2026

Trail

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8th Annual Angel Run at Red Leg Brewing

Colorado Springs, CO

Friday, May 22nd, 2026

10K

View details for race 8th Annual Angel Run at Red Leg Brewing

Farish Trail Race

Woodland Park, CO

Saturday, May 23rd, 2026

Half

10K

Trail

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DRMABPsi 1–5K Walk, Run & Roll

Denver, CO

Saturday, May 30th, 2026

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

The Big Run Presented By Brooks

Colorado Springs, CO

Wednesday, June 3rd, 2026

View details for race The Big Run Presented By Brooks

Aiden's Adventure 5k

Colorado Springs, CO

Saturday, June 6th, 2026

1 Mile

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

Louisville, CO

Sunday, June 7th, 2026

Half

10K

Trail

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Flamingo Day 5K

Denver, CO

Sunday, June 7th, 2026

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DU Dash Colorado

Palmer Lake, CO

Sunday, June 7th, 2026

10K

Trail

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The Big Run Presented by Brooks

Denver, CO

Sunday, June 7th, 2026

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Tutu Dash 5K

Broomfield, CO

Saturday, June 13th, 2026

1 Mile

Trail

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All-Out Summer Breeze

Arvada, CO

Saturday, June 13th, 2026

Half

10K

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Treat Trot Denver

Denver, CO

Saturday, June 13th, 2026

10K

15K

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Stepping Stone 5K

Littleton, CO

Saturday, June 13th, 2026

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Treat Trot Denver

Thornton, CO

Saturday, June 13th, 2026

10K

15K

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Treat Trot Colorado Springs

Colorado Springs, CO

Sunday, June 14th, 2026

10K

15K

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The Bullfrog Splashdown

Littleton, CO

Sunday, June 14th, 2026

10K

1 Mile

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Fatherhood 5k Family Run/Walk

Colorado Springs, CO

Saturday, June 20th, 2026

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Parker Parks and Recreation Dash Across the Dam...

Parker, CO

Saturday, June 20th, 2026

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

Unicorn 5k (North)

Thornton, CO

Saturday, June 20th, 2026

View details for race Unicorn 5k (North)

Muddy Dash | Denver 2026

Dacono, CO

Saturday, June 20th, 2026

View details for race Muddy Dash | Denver 2026

Sunset Trail Running Festival

Boulder, CO

Sunday, June 21st, 2026

12K

Trail

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Juneteenth Fun Run 5K

Denver, CO

Sunday, June 21st, 2026

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14th Annual Buffs4Life Kyle MacIntosh Memorial ...

Boulder, CO

Sunday, June 21st, 2026

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

1 Mile

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

The Red Schoolhouse Run

Louisville, CO

Tuesday, June 23rd, 2026

View details for race The Red Schoolhouse Run

Denver Pride 5K

Denver, CO

Saturday, June 27th, 2026

View details for race Denver Pride 5K

Before The Fourth 5k

Littleton, CO

Saturday, June 27th, 2026

View details for race Before The Fourth 5k

Explore more in Castle Rock, CO

Distances:

5K 10K Half Marathon Marathon

Months:

April May June

Tags:

Trail Boston Qualifiers Fast Courses

State:

All Colorado races

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