In 41 days · Mon, Sep 21, 2026
Don't let race day sneak up
One email during race week. That's it.
When
Monday, September 21st, 2026
Where
847 Port Way, Clarkston WA
Distances
5K · Marathon · 10K · Half
Typical weather
54–76°F · low rain risk
See last 10 years
On this date: rain 2 of the last 10 years
2025
58–77°F
rain
2024
49–73°F
dry
2023
51–59°F
rain
2022
56–80°F
dry
2021
47–77°F
dry
2020
53–83°F
dry
2019
52–72°F
dry
2018
49–80°F
dry
2017
46–61°F
dry
2016
56–70°F
dry
Best months to race in Washington →
About this race
Event Overview
- Race Series: World's Best Marathon & Half Series!
- Event Date: 2026-09-21
- Location: 847 Port Way, Clarkston, WA
- Registration Link: Register Here
What to Expect
- No Time Limits: Everyone can enjoy the race at their own pace!
- Great Food: Enjoy delicious options throughout the event.
- Award-Winning Medals: Earn unique medals for your achievements.
- Loony Community: Join a fun and supportive group of fellow runners!
Event Details and Schedule
- Website: For additional details about this series, visit our website.
- Northwest Series: Visit the Northwest Series page for course details.
- Facebook Groups: Stay updated by joining our Main Group and Northwest Series Group.
- Questions: For inquiries, email us at MB@MainlyMarathons.com.
Merchandise
- Online Store: Check out our online store HERE.
- In-Person Items: We'll offer hats, stickers, magnets, mugs, and more at the races.
- Variety: Explore a variety of fun designs and quality merchandise.
- Showcase Your Loony: Represent our community with your Mainly Merch purchases!
Join Us!
We RUN this country, TOGETHER!
Course map
Train with a club
Run clubs near Clarkston to train with before race day.
See all run clubs near Clarkston →
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