Boulder Marathons Events

Boulder Rez Marathon

Boulder Reservoir 15 Aug 2026

Boulder Stroke and Stride Series

Boulder Reservoir 23 Jul 2026

Around the World in 2026

Boulder 31 Jan 2026

2026 Mothman Mayhem Miles 1M 5K 10K 13.1 26.2

Boulder 7 Feb 2026

Just One More Mile Virtual Race 2026 | Global Running Day Virtual

Boulder 3 Jun 2026

Purple Heart Day Virtual Race 2026 | 1M 5K 10K 13.1 26.2

Boulder 1 Aug 2026

Day of the Dog Virtual Race 1M 5K 10K 13.1 26.2

Boulder 22 Aug 2026

Race Through Colorado Virtual Race | 5K, 10K, Half Marathon | Run Anywhere

Boulder 9 May 2026

Peony Virtual Race | 1M 5K 10K 13.1 26.2 | Language of Flowers Collection

Boulder 30 May 2026

Yeti Frostbite Miles Virtual Race| Cryptid Quest Series 1M 5K 10K 13.1 26.2

Boulder 11 Jul 2026

2026 Be Brave 1M 5K 10K 13.1 26.2

Boulder 7 Mar 2026

Race Through Hawaii Virtual Race | 5K, 10K, Marathon | Run Anywhere

Boulder 16 May 2026

Lavender Virtual Race 1M 5K 10K 13.1 26.2 | Language of Flowers Collection

Boulder 27 Jun 2026

Race Through Alaska 1M 5K 10K 13.1 26.2 Virtual Race

Boulder 18 Apr 2026

I'm Your Huckleberry 1M 5K 10K 13.1 26.2

Boulder 28 Feb 2026

Race Through Alabama 1M 5K 10K 13.1 26.2 Virtual Race

Boulder 11 Apr 2026

Race Through Arizona 1M 5K 10K 13.1 26.2 Virtual Race

Boulder 25 Apr 2026

Race Through Georgia Virtual Race | 5K, 10K, Half Marathon & More | Run

Boulder 2 May 2026

Consider the Wildflowers 1M 5K 10K 13.1 26.2

Boulder 1 Mar 2026

Face Your Giants Virtual Race 2026 | Christian Virtual Run

Boulder 6 Jun 2026

2026 Taco Sloth 1M, 5K, 10K, 13.1, 26.2

Boulder 22 Feb 2026

2026 First Responders 1M 5K 10K 13.1 26.2

Boulder 28 Mar 2026

2026 New Year Challenge -Year of the Horse 2.026 Mile 20.26 Mile 202.6 MILE

Boulder 15 Feb 2026

Cat Day Virtual Race 1M 5K 10K 13.1 26.2

Boulder 9 Aug 2026

Unhinged and Feral 1M 5K 10K 13.1 26.2 - Now Only $18!

Boulder 3 Oct 2026

2026 Full Moon Challenge 12K and 12M

Boulder 7 Feb 2026

2026 Race to Read 1M 5K 10K 13.1 26.2

Boulder 6 Mar 2026