Upcoming Races Near Thornton, CO

Name: Unicorn 5k (Denver-East)
Start: 2026-04-26
End: 2026-04-26
Location: Denver

Arctic Prairie Dog Half, 10k & 5k

Louisville, CO

Sunday, January 18th, 2026

Featured

Half

10K

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

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Colorado Cold Rush

Louisville, CO

Sunday, January 18th, 2026

10K

View details for race Colorado Cold Rush

Polar Bear Run and Plunge

Fort Collins, CO

Saturday, January 24th, 2026

View details for race Polar Bear Run and Plunge

Freakin Freezin 5K - Denver

Denver, CO

Sunday, January 25th, 2026

View details for race Freakin Freezin 5K - Denver

Yeti Chase 5k/10k

Morrison, CO

Sunday, January 25th, 2026

10K

View details for race Yeti Chase 5k/10k

RMRR Feb Trophy Series

Englewood, CO

Sunday, February 1st, 2026

View details for race RMRR Feb Trophy Series

Edora Park T&H 8K

Fort Collins, CO

Sunday, February 1st, 2026

View details for race Edora Park T&H 8K

Running Up for Air - Staunton Rocks

Pine, CO

Friday, February 6th, 2026

Trail

View details for race Running Up for Air - Staunton Rocks

Westy Winter Waggle 5&10k

Westminster, CO

Saturday, February 7th, 2026

10K

View details for race Westy Winter Waggle 5&10k

Super Sunday 5K

Littleton, CO

Sunday, February 8th, 2026

View details for race Super Sunday 5K

Sweetheart Classic

Loveland, CO

Saturday, February 14th, 2026

View details for race Sweetheart Classic

Parker Parks and Recreation Love 'em or Leave '...

Parker, CO

Saturday, February 14th, 2026

10K

View details for race Parker Parks and Recreation Love 'em or Leave 'em Valentine's Day 5K/10K

Virginia Canyon is for Lovers

Idaho Springs, CO

Saturday, February 14th, 2026

Trail

View details for race Virginia Canyon is for Lovers

Heart Throb 5k

Arvada, CO

Saturday, February 14th, 2026

Fast

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Ralston Creek Half Marathon & 5k

Arvada, CO

Sunday, February 15th, 2026

Trail

View details for race Ralston Creek Half Marathon & 5k

Chilly Cheeks Duathlon

Englewood, CO

Saturday, February 21st, 2026

Fast

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Highlands Ranch 5k

Highlands Ranch, CO

Sunday, February 22nd, 2026

View details for race Highlands Ranch 5k

Bacon Strip Race

Fort Collins, CO

Sunday, February 22nd, 2026

10 Miles

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All-Out Mardi Crawl

Arvada, CO

Sunday, February 22nd, 2026

Half

10K

Trail

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Time to Paddy 5k/10k & Lucky 13.1 - Denver

Denver, CO

Saturday, February 28th, 2026

10K

Half

View details for race Time to Paddy 5k/10k & Lucky 13.1 - Denver

RMRR March Trophy Series

Littleton, CO

Sunday, March 1st, 2026

Fast

View details for race RMRR March Trophy Series

Sharin' O' The Green 5k

Fort Collins, CO

Saturday, March 14th, 2026

Fast

View details for race Sharin' O' The Green 5k

Lucky Brew Race 5K, 10K, 15k & Half Marathon

Severance, CO

Saturday, March 14th, 2026

10K

15K

View details for race Lucky Brew Race 5K, 10K, 15k & Half Marathon

HRCA St. Patrick's Day 5K

Highlands Ranch, CO

Saturday, March 14th, 2026

View details for race HRCA St. Patrick's Day 5K

Erin Go Bragh 7.77k

Westminster, CO

Saturday, March 14th, 2026

View details for race Erin Go Bragh 7.77k

Lucky Leprechaun 5K

Boulder, CO

Sunday, March 15th, 2026

View details for race Lucky Leprechaun 5K

Lucky Brew Race 5K, 10K, and 15K

Windsor, CO

Saturday, March 21st, 2026

10K

15K

Trail

View details for race Lucky Brew Race 5K, 10K, and 15K

All-Out Spring Fever

Golden, CO

Sunday, March 22nd, 2026

Half

10K

Trail

View details for race All-Out Spring Fever

Central Park 5k

Denver, CO

Sunday, March 22nd, 2026

Fast

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The City Park Circuit

Denver, CO

Saturday, March 28th, 2026

Fast

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Cryogenic Cannibal Chase

Estes Park, CO

Saturday, March 28th, 2026

View details for race Cryogenic Cannibal Chase

RMRR Spring Marathon Training Series #1

Thornton, CO

Sunday, March 29th, 2026

10 Miles

Ultra

View details for race RMRR Spring Marathon Training Series #1

Three Creeks Half Marathon

Englewood, CO

Sunday, April 5th, 2026

Half

Trail

Fast

View details for race Three Creeks Half Marathon

Run the Ranch

Loveland, CO

Friday, April 10th, 2026

10K

Trail

View details for race Run the Ranch

RMRR Spring Marathon Training Series #2

Thornton, CO

Saturday, April 11th, 2026

10 Miles

Ultra

View details for race RMRR Spring Marathon Training Series #2

Spring Fling Prairie Dog Half, 10k, & 5k

Arvada, CO

Sunday, April 12th, 2026

Half

10K

View details for race Spring Fling Prairie Dog Half, 10k, & 5k

Donut Dash

Denver, CO

Sunday, April 12th, 2026

Fast

View details for race Donut Dash

Prairie Dog Run Series

Louisville, CO

Sunday, April 12th, 2026

Half

View details for race Prairie Dog Run Series

RMRR April Trophy Series

Denver, CO

Sunday, April 12th, 2026

View details for race RMRR April Trophy Series

Platte River Half-Marathon and Relay

Littleton, CO

Sunday, April 12th, 2026

Half

Trail

View details for race Platte River Half-Marathon and Relay

Healthy Kids Running Series Spring 2026 - Denve...

Denver, CO

Sunday, April 12th, 2026

View details for race Healthy Kids Running Series Spring 2026 - Denver, CO

All-Out Beat the Heat

Westminster, CO

Saturday, April 18th, 2026

Half

10K

Trail

View details for race All-Out Beat the Heat

Great Western Trail Race

Severance, CO

Saturday, April 18th, 2026

10K

Half

Trail

View details for race Great Western Trail Race

Fairmount 5k

Golden, CO

Sunday, April 19th, 2026

1 Mile

View details for race Fairmount 5k

Horsetooth Half Marathon

Fort Collins, CO

Sunday, April 19th, 2026

Half

Trail

Fast

View details for race Horsetooth Half Marathon

DoNot Stop Half Marathon (5k/10k) - Denver

Littleton, CO

Sunday, April 19th, 2026

10K

1 Mile

View details for race DoNot Stop Half Marathon (5k/10k) - Denver

Bigfoot Half Marathon

Estes Park, CO

Saturday, April 25th, 2026

Half

View details for race Bigfoot Half Marathon

Runs With Scissors Races

Brighton, CO

Saturday, April 25th, 2026

Half

Marathon

Ultra

View details for race Runs With Scissors Races

2026 Flying Pig 5K

Fort Collins, CO

Sunday, April 26th, 2026

View details for race 2026 Flying Pig 5K

Unicorn 5k (Denver-East)

Denver, CO

Sunday, April 26th, 2026

View details for race Unicorn 5k (Denver-East)

Explore more in Thornton, CO

Distances:

5K 10K Half Marathon Marathon

Months:

January February March

Tags:

Trail Boston Qualifiers Fast Courses

State:

All Colorado races

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