Ötillö Swimrun Colorado 2026

Far from the islands and salty sea spray, this swimrun breathes the thin air of the Rockies ⛰️. Right in the middle of October, Fort Collins hosts the only altitude race on the U.S. circuit, perched more than 1,500 m above sea level : we're obviously talking about the Ötillö Swimrun Colorado ! 🤠 The playground is split between the steep trails of Lory State Park and the coves of the Horsetooth Reservoir, a mountain–freshwater duo that stands in stark contrast to the usual archipelagos of the ÖTILLÖ circuit 🏆.

Still very young, this event was born on October 5, 2025 at the initiative of Lars Finanger, director of the circuit’s U.S. races and a declared lover of Colorado, where he lived for a decade 🏜️. Around 200 competitors set off in that very first edition, drawn by a format that promises the adventure of triathlon without ever getting on a bike 🚴‍♂️. The idea took root during a visit to the site by Finanger himself, won over by the reservoir’s potential and by having a brother living locally—proof that the best races sometimes come from a simple glance in the right place 👀.

Nothing to do with a classic out-and-back between two points: here, the course loops as a closed circuit—run out toward the reservoir, plunge into its cool water, then head back to Lory State Park via technical, rocky trails 🪨. Altitude changes everything from the very first meters; every stride in these mountains costs more oxygen than at sea level 🫁. Competitors also race in teams connected by a tether—an element that’s as reassuring as it is binding: if someone hits a rough patch, their partner can literally tow the other while swimming 🏊. It leaves an emergency option that even some organizers admit they’ve tested themselves 🫣.

Three formats share out the effort. The "Experience" covers 9,656 m, including 2,414 m of swimming and 7,242 m of running for 89 m D+, designed as a solid initiation to altitude 👌. The "Sprint" totals 17,703 m: 4,828 m of swimming and 12,874 m of running for 288 m D+, a route already demanding enough to test the breathing of those used to sea level 🔍. The "World Series", the day’s benchmark, stretches over 37,820 m with 8,045 m of swimming and 29,773 m of running for 637 m D+—an elevation gain that goes well beyond that of all the other U.S. circuit events and makes this edition one of the toughest on the ÖTILLÖ calendar 📈.

The water, for its part, never really warms up despite the Colorado sun ☀️. The reservoir tops out around 13 to 15°C while the air fluctuates between 15 and 18°C, a gap that demands a full wetsuit from the first to the last swum meter ❄️. Before the start, a group warm-up in the swimming area at Horsetooth helps tame the cold, while the finish offers a completely different treatment: sauna and ice bath await competitors for recovery 🤓. This contrast sums up the spirit of this race pretty well—between alpine rigor and well-earned comfort 🧖‍♂️.

Once the wetsuit has been pulled on for the last time of the season, the university town takes over. Colorado State University fuels Fort Collins with a campus energy that rubs off on the whole city, between lively patios and a youthful vibe all year round 👯. The city has built a reputation that reaches far beyond Colorado: that of the American capital of craft beer, with a density of breweries high enough to turn any post-race day into a well-deserved crawl (drink alcohol in moderation!) 🍺. Enough to extend the stay well after crossing the finish line, between two patios and one last lap on the trails of Lory State Park, this time without a stopwatch 🧘‍♀️.

Here, the only thing that drops faster than the altitude is the satisfaction of having crossed the line 🏔️.