Trail Running calendar near Seaside 2026-2027

An obstacle course at Lacamas Lake Regional Park featuring a 4+ mile natural-terrain course with 10+ obstacles, a kids loop for ages 4–10, and a festival area with local vendors and BBQ.

Outlast Portland is a 6 hour trail challenge of six timed 5K laps run on the hour. Runners who complete four or five laps earn patches and those who finish all six earn a medal and a national leaderboard ranking.

Volunteer event at Marble Mountain Sno Park near Cougar, WA where crews carry water into remote aid stations for a race. Each day includes an about nine mile roundtrip hike and nearby camping is available.

A low-key evening trail running series in Forest Park, organized as three Series of five races with courses around 4 to 7 miles. The Series includes standings, a post-Series awards gathering, and benefits the Forest Park Conservancy.

A two day trail event at Mt St Helens near Cougar, WA offering a full loop 50K with about 7400 ft elevation and a 25K option over varied volcanic terrain.

A low-key evening trail running series in Forest Park, organized as three Series of five races with courses around 4 to 7 miles. The Series includes standings, a post-Series awards gathering, and benefits the Forest Park Conservancy.

A 20 mile single track trail run on the south western side of Mount St Helens, featuring lava fields, stream crossings, old growth forest and a 9 hour cutoff on National Forest lands.

Trail races near Mount St. Helens in the Mt. Margaret Backcountry, offering 50K, 20 mile and half marathon loops with remote terrain, ridgeline views, lakes and varied wildlife.

A low-key evening trail running series in Forest Park, organized as three Series of five races with courses around 4 to 7 miles. The Series includes standings, a post-Series awards gathering, and benefits the Forest Park Conservancy.

A cross country 5k on a flower farm in Tillamook, Oregon, featuring mud pits, two river crossings, wood-chipped trails, a corn maze, and fields of flowers. Two open races are held with combined results.

The Long Watch is a 6 hour, 12 hour and 24 hour loop endurance event at Donald Farm in Woodland, Washington, held alongside the Warrior Expo, with a manned aid station and a one mile loop past competition and vendor areas.

A Portland event offering a 50K and a longer roughly 53 mile option. The mostly paved course includes a steeper one mile trail section, is unsupported, and uses GPX files rather than course markings.

A low-key evening trail running series in Forest Park, organized as three Series of five races with courses around 4 to 7 miles. The Series includes standings, a post-Series awards gathering, and benefits the Forest Park Conservancy.

A 5k cross country meet on September 19, 2026, at Alderbrook Golf Course in Tillamook, OR, run on a championship-style course with most of the route on shortly clipped fairways.

The Three Course Challenge is a cross country meet at Camp Rilea north of Seaside, Oregon on September 26, 2026. It features multiple middle and high school courses, chip timing, team lodging, live drum corps performances, and awards.

A two day running festival on the Long Beach Peninsula offering races from kids dashes to a sand marathon. The weekend includes an expo, awards across many categories, and support for local charities.

A 3.1 mile obstacle run with 22 symbolic obstacles representing the journey from captivity to liberation. Held in Happy Valley, OR on September 26, 2026, all proceeds support organizations that fight human trafficking and survivor rehabilit..

Mission Possible at Willamette Mission State Park on 26 September 2026 offers chip-timed 5K and 10K trail races plus accessible All Abilities 2.25-mile and 1.6-mile loops, with volunteers on course and post-race pancakes and snacks.

A five-race cross country series in Portland parks with separate men’s and women’s races, options for non-binary entrants, race distances of 5K 6K and 8K, and both series and individual registration fees.

A low-key evening trail running series in Forest Park, organized as three Series of five races with courses around 4 to 7 miles. The Series includes standings, a post-Series awards gathering, and benefits the Forest Park Conservancy.