September 12, 2027
Horsetooth Reservoir, Fort Collins, Colorado
Other 2026 Open Water Events in Colorado:
Mountain Swim Series
- June 14, 2026 – Solstice Sunrise Swim, Longmont, CO
- July 18, 2026 – Carter Lake, Berthoud, CO
- August 1, 2026 – Willow Creek – Granby, CO
- August 22, 2026 – Castle 2.5k/5k/10k – Pine, CO
- August 23, 2026 – Wellington Swim-Run, Pine CO