September 13, 2026
Horsetooth Reservoir, Fort Collins, Colorado
Now Hosting the Official 2026 COMSA 1.2 Mile Open Water Championship!
Click Here to Order Exclusive Horsetooth Swims Merch! Fleece Hoodies! Beanies!
10 km Open Water Swim – Registration is closed.
1.2 mile Open Water Swim – Registration Full
2.4 mile Open Water Swim – Registration Full
250 meter Youth Open Water Swim – Registration closes 7am MDT 9/10/26
1000 meter Youth Open Water Swim – Registration closes 7am MDT 9/10/26
Results (when available)
2026 Horsetooth Results
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