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2026 Northwest Series - Day 3 (WA)

Clarkston, Washington, United States

calendar_today 21 Sep, 2026 – 22 Sep, 2026

directions_run Running

language Official Website

sell $55.00 – $155.00

About the Event

World's Best Marathon & Half Series!

No Time Limits

Great Food

Award-Winning Medals

Loony Community!

We RUN this country, TOGETHER!

Thanks for running with Mainly Marathons! Take a look at our website for additional details about this series and our other series of races. Take a look at the Northwest Series page to get details on each course.

Also, join our Facebook group to stay up-to-date with our loony adventures: Main Group and Northwest Series Group.

If you're interested in some Mainly Merch, check out our online store HERE. We'll offer some items (hats, stickers, magnets, mugs, etc.) in-person at the races, the Mainly Merch store best option for a variety of fun designs and quality merchandise to showcase your loonacy!

If you have any questions, email MB@MainlyMarathons.com

We RUN this country, TOGETHER!

Races Offered

10K - Individual Age group/open

Sep 21, 2026

straighten

Distance — 10K

terrain

Type — Running

timer

64 days remaining

sell

$65.00

50K - Individual Age group/open

Sep 21, 2026

straighten

Distance — 50K

terrain

Type — Running

timer

64 days remaining

sell

$155.00

5K - Individual Age group/open

Sep 21, 2026

straighten

Distance — 5K

terrain

Type — Running

timer

64 days remaining

sell

$55.00

Half Marathon - Individual Age group/open

Sep 21, 2026

straighten

Distance — 21.1K

terrain

Type — Running

timer

64 days remaining

sell

$125.00

Marathon - Individual Age group/open

Sep 21, 2026

straighten

Distance — 42.2K

terrain

Type — Running

timer

64 days remaining

sell

$145.00

Weather History

These values represent the 3-year monthly averages for September in Clarkston.

thermostat Temperature

15.2° / 27.5°

wb_sunny Feels like

14.5° / 26.2°

light_mode Avg sunshine hours

10h 18m

water_drop Avg rainfall

0.7 mm

ac_unit Avg snowfall

—

air Avg wind speed

4.7 km/h (Light breeze)

opacity Sweat loss rate

High

terrain Course conditions

Hard and dry surface

sunny Max UV Index

Moderate (3.5)

humidity_mid Humidity

52.2%

wb_twilight Sunrise

06:27

nightlight Sunset

18:58

About Clarkston

Learn more about the host city, Clarkston.

Clarkston is a city of 7,200 people (2020) in the Palouse region of eastern Washington. It sits across the Snake River to the west of Lewiston, Idaho.