Issaquah Schools Foundation Monster Mash 5K
About this race
We welcome all-ages and abilities. Convenient onsite parking, phased start times, and a professionally chip-timed course ensure a great experience for all. You’ll appreciate the flat, paved, out-and-back route whether you’re setting a new 5K PR or enjoying a brisk walk together as a family! Bring your creativity – festive costumes are encouraged! This event sells out every year, so don't wait to register! Every registration submitted by October 12th receives a 2026 Monster Mash technical race tee & medal. Registrants receive free event photos and raffle tickets for prizes as well! Placement awards for fastest finishing times will also be presented. See below for details.
Pick your distance
Running
In-Person 5K
Technical Race Tee & Medal Included
Virtual 5K
Technical Race Tee & Medal Included. Pick-up at ISF required.
Typical race-day weather
Based on 4 years of historical conditions on this event's race dates in Issaquah.
About Issaquah
Issaquah Schools Foundation Monster Mash 5K takes place in Issaquah, Washington, United States. The local timezone is America/Los_Angeles.
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🏃 Plan Your Next Race in Issaquah
Find upcoming events by distance:
- Issaquah 5K Races Best Issaquah routes for beginners and speed work.
- Issaquah Running Calendar 2026 See all upcoming race dates.
Race information has been sourced from the event's official website and other publicly available resources. For the most up-to-date details, please refer to the official website directly. If you notice any incorrect or missing information, don't hesitate to reach out to us by email.
