Course
50K50 km
Marathon42.2 km
Half Marathon21.1 km
10K10 km
5K5 km
Key dates
- ★Race daySeptember 2027 · date to be announced
Provisional date, projected from last year — the organiser has not announced this edition yet. We show the month only.
About
Northwest Series is organized by Mainly Marathons, one of the largest race organizers in the US, with races in all 50 states. You can participate in one race or take the challenge to complete the whole series! Mainly Marathons races are designed for runners who run long and run often. All finishers in races longer than half marathon get a custom metal-stamped nameplate!
Your next race, seen from above.
Save Mainly Marathons Northwest Series - Day 1 to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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Save Mainly Marathons Northwest Series - Day 1 to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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Prefontaine Memorial Run
Retrace Steve Prefontaines old training roads to the finish track
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Run this event? Claim it on runcalendar.com
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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.