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Trail Running Calendar near Snohomish 2026-2027

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Explore the top trail runs near Snohomish for 2026-2027! We've gathered 28 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.

August 2026
Aug
8
Sa

Cougar Mountain Trail Run Series

Trail Run 3 mi 5 mi ... 26 mi 50 km
Experience the lush forests and single track trails of Bellevue in this eco friendly trail series. Choose from three distances ranging from a 5K to a full marathon while supporting King County Parks.
Aug
15
Sa

One Step Closer

Backyard Ultra 30 min
Timed endurance event on August 15, 2026 in Lincoln Park, Seattle, where runners cover as many laps as possible on an about two-mile shoreline-and-forest loop. Features a team Battle of the Run Club, kids Loopy races, festival-style support, and cupl..
Aug
29
Sa

Summer Spirit Run

Road Race Obstacle Run Walk 5 km 10 km 15 km
Join this summer event at Magnuson Park in Seattle featuring traditional road races and an obstacle dash. Choose from distances ranging from a kids 400m to a 15k run in a beautiful Pacific Northwest setting.
September 2026
Sep
12
Sa

Beat the Blerch

Trail Run 5 km 10 km 13 mi 26 mi
Beat The Blerch in Carnation, WA offers 5K, 10K, half and full marathon distances on a flat out and back gravel trail through mossy evergreen forest, with stocked aid stations including Nutella sandwiches and birthday cake.
Sep
12
Sa

Corn Maze Craze

Trail Run Walk 5 km 7 km
A fall trail run at Bob's Corn and Pumpkin Farm featuring a 5k one-lap maze option and a 7k two-lap maze option on farm roads and paths.
Sep
16
We

Seattle CF StairClimb

Urban Trail
A timed stair-climb at T-Mobile Park where participants tackle either 900 or 1,800 stairs to raise funds for the Cystic Fibrosis Foundation. Climbers start in waves by self-identified pace and join an official after party.
Sep
19-20
Sa - Su

Seattle North Spartan North American Championship Weekend

Obstacle Run 5 km 10 km Half Marathon
A multi-day Spartan obstacle race weekend in Monroe WA featuring wooded Pacific Northwest trails and a program of Sprint, Super, Beast, kids races, workshops and spectator access.
Sep
19
Sa

Dragonslayer Fantasy Dash and Strut - Seattle

Trail Run 5 km
A fantasy themed 5K walk and run at Magnuson Park with mixed trail surfaces, Villain Zones, and a Heroes Village; costumes encouraged and leashed dogs and strollers welcome.
October 2026
Oct
17
Sa

Where's Bigfoot 5K

Road Race Trail Run Walk 3 mi
Where's Bigfoot 5k takes place in Seattle on October 17, 2026 with in person, virtual, and free untimed kid entries. The course is 3.1 miles and registration periods and fees vary by entry type.
Oct
17
Sa

Osprey Ambler

Backyard Ultra
Timed 3 hour and 6 hour loop trail event at Osprey Park in Sultan, WA on a 1.06 mi dirt single track with minimal elevation and an aid station.
Oct
24
Sa

Carkeek 12 Hour

Backyard Ultra
Timed trail event at Carkeek Park with 12 hour and 6 hour options, in-person Oct 24 and virtual Oct 1–31; limited field and proceeds support local trails.
Oct
24
Sa

West Seattle Monster Dash

Trail Run Walk 5 km
A costumed community event at Lincoln Park featuring a trail 5K, kids dashes, and a virtual shirt option to support South Seattle College Cooperative Preschools. Registration includes a Monster Dash shirt and the 5K includes a timed bib.
Oct
31
Sa

Spooky 10K Trail Race

Trail Run 10 km
A 10K trail race in Port Gamble, WA with single-track and dirt roads, about 600 feet of climbing, a costume contest, and awards including masters categories.
Oct
31
Sa

Cougar Mountain Trail Run Series

Trail Run 5 km 8 mi 20 mi 50 km
Trail races at Cougar Mountain Regional Wildland Park near Seattle offering 5k, 7.6 mile, 19.5 mile and 50k courses through forested single track, rolling hills and marshes. Proceeds support King County Parks.
November 2026
Nov
7
Sa

Grand Ridge Trail Run

Trail Run 5 mi 13 mi 26 mi 50 km
Grand Ridge is the Evergreen season finale with 5-mile, half, marathon and 50K courses through forested Cascade foothills and cupless aid support.
Nov
7
Sa

Carkeek Cooler Trail Run

Trail Run 5 km 10 km
Trail running at Carkeek Park in Seattle with 5k and 10k forest courses featuring varied trail widths and rolling to steep sections. The 10k is two laps of the 5k and includes substantial climb.
Nov
21
Sa

Ravenna Refresher Trail Run

Trail Run 4 km 8 km 12 km
Trail races at Ravenna Park on November 21, 2026 with 4k, 8k and 12k options on a 4.1 km forest loop featuring moderate climbs and an aid station offering water and snacks.
December 2026
Dec
5
Sa

Redmond Reindeer Romp

Trail Run 5 mi Half Marathon
A winter trail run at Redmond Watershed Preserve on December 5, 2026 offering 5 mile and half marathon distances. Wide groomed trails, shuttle parking, on course aid for the half marathon, and a Winter Wonderland costume contest.
Dec
19
Sa

Seward Solstice Run

Trail Run 4 mi 10 km
A forest loop at Seward Park on December 19, 2026, offering 4.2-mile and 10k trail distances, an aid station, and a Glitter, Glamour, and the Galaxy costume contest as part of the Winter Trail Series.
January 2027
Jan
2
Sa

Absolution Run

Trail Run 4 mi 8 mi
A winter trail run at St. Edward State Park offering 4 mile and 8 mile looped courses with lakeshore single track, an on-course aid station, and nearby parking options including an alternate Bastyr University lot.
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