Castle 5K/10K

Name: Castle 5K/10K
Start: 2026-08-22
Location: Bailey

Bailey, CO • August 22, 2026

10K5K2.5K

Website

The Castle 5K/10K is the highest altitude organized marathon swim event in the country at ~8,000 feet. It is hosted at Wellington Lake, near Conifer in Colorado. 2.5K, 5K and 10K swims are available.

Other Races by Mountain Swim Series

Solstice Sunset Swim

June 14, 2026

Longmont, CO

Carter Lake Crossing

July 18, 2026

Loveland, CO

Please visit the official race website to confirm all details.