Lewis-Clark Half Marathon & 5K

Saturday, October 14, 2023 • Clarkston, WA • Course Map

One of Washington’s smaller running races but also one of its most scenic, the Lewis & Clark Half Marathon & 5K Fun Run runs along a beautiful riverside course that runs alongside Idaho’s Snake River, through the cities of Clarkston and Lewiston, with the turnaround point in nearby Asotin, Washington, just to the south.

The starting and finish lines for the race lie at Granite Lake Park on Port Way in nearby Clarkston, which lies just over the state line in Washington to the west of Lewiston.

From there, runners follow an out-and-back course almost entirely along the Snake River, following the bends of the river as it curves its way southward down to the half marathon’s turnaround point in Asotin. Once there, runners begin their trek back along the trail’s fast and flat course, made up mostly of paved surfaces throughout the race.

Organized by Lewiston’s Seaport Striders running club, the race is open to runners who wish to run the half marathon either as individual participants or as members of two- or three-person relay teams, and the day’s events also include a 5K “fun run,” which follows an out-and-back course from the starting point at Granite Lake Park to Beachview Park and back.

Race Weather & Climate

Located near the confluence of the Snake and Columbia Rivers in the northern Idaho panhandle, along the state line with Washington, Lewiston typically sees October temperatures that average between 62°F and 41°F, while rainfall totals average just under an inch for the month.

On the day of the race (Oct. 14), the average low is 40°F and the average high is 59°F.

Course Map

See the race route map for the Lewis-Clark Half Marathon.

Starting Time

9:00 AM


$15 – $20 for the half marathon, 5K


To reserve your spot in the 2023 running of Clarkston’s Lewis & Clark Half Marathon or 5K fun run, register online at RaceEntry.com.

Official Race Website



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See more races in: October, Washington