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2025 Monster Mash 5K
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!…
Saturday, October 25, 2025 10:00 am – 12:00 pm 2025 Monster Mash 5K
Lake Sammamish Boat Launch
4455 East Lake Sammamish Pkwy SE
Issaquah, WA 98029