Lake Sammamish Boat Launch
4455 East Lake Sammamish Pkwy SE
Issaquah, WA 98029


Join us October 25th for the return of Monster Mash 5K!
Help us raise a MONSTROUS amount of support for local students on October 25th!
ISF Monster Mash 5K is a community-based, family-friendly event that raises funds for programs that serve students attending all 27 ISD schools.

EVENT
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 morning walk together as a family! Bring your creativity – festive costumes are encouraged!
REGISTRATION PERKS
Every registration submitted by October 13th receives a 2025 Monster Mash technical race tee & medal. All registrants receive free event photos and raffle tickets for prizes as well! Placement awards for the top three finishing times by age category will also be presented.
