In 18 days · Tue, Sep 22, 2026
Don't let race day sneak up
One email during race week. That's it.
When
Tuesday, September 22nd, 2026
Where
847 Port Way, Clarkston WA
Distances
Marathon · 5K · Half · 10K
Typical weather
54–75°F · low rain risk
See last 10 years
On this date: rain 2 of the last 10 years
2025
50–74°F
dry
2024
47–75°F
dry
2023
48–62°F
dry
2022
58–69°F
rain
2021
51–78°F
dry
2020
63–77°F
dry
2019
53–79°F
dry
2018
60–69°F
dry
2017
43–64°F
dry
2016
53–63°F
rain
Best months to race in Washington →
About this race
Event Overview
- Series: World's Best Marathon & Half Series!
- Time Limits: No Time Limits
- Food: Great Food
- Medals: Award-Winning Medals
Community Spirit
- Camaraderie: Loony Community!
- Motto: We RUN this country, TOGETHER!
Event Details
- Date: 2026-09-22
- Location: 847 Port Way, Clarkston, WA
- Registration: Click here to register
Additional Information
- Website: Take a look at our website for additional details about this series and our other series of races.
- Course Info: Check the Northwest Series page to get details on each course.
- Stay Connected: Join our Facebook group to stay up-to-date with our loony adventures: Main Group and Northwest Series Group.
Merchandise
- Online Store: If you're interested in some Mainly Merch, check out our online store HERE.
- In-Person Offers: We'll offer some items (hats, stickers, magnets, mugs, etc.) in-person at the races.
- Variety: The Mainly Merch store is the best option for a variety of fun designs and quality merchandise to showcase your loonacy!
Contact Us
- Inquiries: If you have any questions, email MB@MainlyMarathons.com.
Final Note
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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