Monster Mash 5K - Issaquah

The Monster Mash 5K is held in Issaquah, Washington, near Lake Sammamish. In-person 5K includes a T-shirt and medal; a medal-only option and a Virtual 5K with T-shirt and medal are also offered. Early packet pickup is Friday at the Issaquah Schools Foundation, with timing bib, medal, T-shirt (registered by cutoff), and Discover Passes.

Parking is at the Lake Sammamish Boat Launch near the start/finish, with Discover Pass requirements and overflow parking at the ISD Administration lot. Start/finish near the Lake Sammamish Boat Launch at 4455 E Lake Sammamish Pkwy SE, Issaquah; event on October 25, 2025. It is presented by the Issaquah Schools Foundation. Visit the organization's website for the most recent information.