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12 hr6 hrClosed

Carkeek 12 Hour

Seattle, WashingtonEndless TrailsField of 50
6 hr entry
$75
Days to go
2
Registration pageendlesstrails.us

At a glance

Date
Oct 24, 2026
Location
Seattle, Washington
Distances
12 hr, 6 hr
Elevation gain
436 ft
Registration
Closed Oct 21, 2026, via ultrasignup.com

Listed from UltraSignup. Checked Oct 22, 2026.

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About this race

The Carkeek 12-Hour (and 6-Hour) is a timed loop race held at Carkeek Park in Seattle, WA, featuring a 1.93-mile loop with 436 feet of elevation gain per loop. Now in its 20th year, it is known as one of the toughest 12-hour races around, with Halloween costumes encouraged and prizes awarded.

Key dates

Virtual ends

May 31, 2026

Registration closes

Oct 21, 2026

Race day

Oct 24, 2026

2d

Pricing

12HR

Standard (In-Person, after May 31)

$80

6HR

Standard (In-Person, after May 31)

$75

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Similar races

  • Grand Ridge

    Nov 7Issaquah, WA50K, Marathon +2

    22 mi from Carkeek 12 Hour, 2 weeks after Carkeek 12 Hour, registration open

  • Salt Creek 24

    Oct 24Port Angeles, WABackyard Ultra, 24 hr +1

    56 mi from Carkeek 12 Hour, the same weekend as Carkeek 12 Hour, registration open

Straight-line distance

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