In 7 days · Tue, Sep 22, 2026
Don't let race day sneak up
One email during race week. That's it.
Tuesday, September 22nd, 2026
847 Port Way, Clarkston WA
Marathon · 5K · Half · 10K
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 →
Race-day forecast · Tuesday, Sep 22
Cloudy · 60–77°F
Tuesday, Sep 22starts near 60°F · 11% chance of rain · wind up to 14 mph
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 [email protected].
Final Note
We RUN this country, TOGETHER!
Course map
Hotels for race weekend
Live prices near the start line, Sep 21 – 23, 2026.
Train with a club
Run clubs near Clarkston to train with before race day.
Suggested Races
Organize this race?
Claim it free to manage your listing — and get it featured for free, while spots last.