Upcoming Ultra Races Near Windsor, CO

Organize a race? Get it in front of thousands of runners.

Add it free Feature it

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

Windsor, CO

Saturday, June 20th, 2026

10K

Half

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

RMRR Fall Marathon Training Series

Thornton, CO

Sunday, August 23rd, 2026

10 Miles

Ultra

View details for race RMRR Fall Marathon Training Series

RMRR Fall Marathon Training Series #2

Thornton, CO

Sunday, September 13th, 2026

Ultra

View details for race RMRR Fall Marathon Training Series #2

Buffalo Bicycle Classic

Boulder, CO

Sunday, September 13th, 2026

Ultra

View details for race Buffalo Bicycle Classic

Red Feather Trail Jamboree

Red Feather Lakes, CO

Friday, September 25th, 2026

Ultra

Half

Trail

View details for race Red Feather Trail Jamboree

Estes Epic

Estes Park, CO

Saturday, September 26th, 2026

Ultra

Trail

View details for race Estes Epic

RMRR Fall Marathon Training Series #3

Thornton, CO

Sunday, September 27th, 2026

10 Miles

Ultra

View details for race RMRR Fall Marathon Training Series #3

Weld Your Mettle Running Festival

Eaton, CO

Saturday, June 5th, 2027

Ultra

Marathon

View details for race Weld Your Mettle Running Festival

Explore more in Windsor, CO

Jump straight to races by distance, month, or type.

Distance

5K 10K Half Marathon Marathon

Month

June July August

Race type

Trail Boston Qualifiers Fast Courses

Run clubs

Run clubs in Windsor

Nearby

Loveland Greeley Fort Collins Berthoud Bellvue Longmont All Colorado races