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2026 Monster Mash 5K
REGISTRATION OPENS SEPTEMBER 8, 2026 We welcome all-ages and abilities. Convenient onsite parking, phased start times, and a professionally chip-timed course ensure a great experience…
Saturday, October 24, 2026 10:00 am – 12:00 pm 2026 Monster Mash 5K
Lake Sammamish Boat Launch
4455 East Lake Sammamish Pkwy SE
Issaquah, WA