The Mount Marathon Race in Seward, Alaska has announced a two-year title partnership with Canadian outdoor apparel brand Arc'teryx, covering the 98th edition on 4 July this year and the 99th edition in 2027. The Seward-based race, which describes itself as the toughest 5K on the planet, will be officially branded "Mount Marathon Race presented by Arc'teryx" under the new agreement. It is the first title sponsorship in the event's long history and marks the most significant structural shift for the race since its executive-director transition in 2022.
Race director Matias Saari confirmed the deal in a statement issued on 17 April, describing it as an opportunity to "modernise" parts of the operation that have struggled to keep pace with growing entry demand and rising course-management costs. Under the terms disclosed, Arc'teryx has agreed to earmark a meaningful portion of its sponsorship investment specifically for replacing the downtown fencing on Fourth Avenue, which has been unchanged for most of the last decade and has been cited by stewards as a limiting factor on crowd capacity. The brand will also provide matching funds for a new fund benefitting the Seward Volunteer Fire Department and the Seward Parks and Recreation Department, both of whom supply significant volunteer labour on race day.
Mount Marathon's format is unlike anything else in American trail running. The men's, women's and juniors' races are each roughly 5 kilometres long but climb from sea level in Seward to the 921-metre summit of Mount Marathon and back, with scree, snow patches and loose bedrock on both ascent and descent. Average winning times hover around 41 minutes for the men and 48 minutes for the women — figures that look moderate on paper but conceal vertical gain rates comparable to the steepest sections of Sierre-Zinal or the Zegama Aizkorri. The event sells out its entry lottery each year and draws tens of thousands of spectators to a town with a permanent population of fewer than three thousand.
The 2026 edition will also introduce a new junior development event, "Race from the Base," designed for seven- to ten-year-olds and run over a short out-and-back from the base of the mountain, not the full summit. Team registration for the established adult events opened in early April, with lottery selections confirmed earlier this month, and Arc'teryx has committed to providing race-day kit for all volunteers and officials from this year onward. The brand will operate an on-site expo tent for the first time in the race week leading up to July 4.
The partnership sits within a broader trend of technical outdoor brands moving further into North American trail racing — Hoka at Western States, Salomon at Golden Trail, Mount to Coast at the USATF 100K — and follows Arc'teryx's recent increased involvement in the global trail scene through the Arc'teryx Academy series and its support of athletes including Tom Evans and Anne-Lise Rousset-Séguret. For Seward itself, the hope is that the relationship adds operational resilience without changing the race's distinctive volunteer-driven character. "The race is the race," Saari said. "The fencing is just fencing."