Get ready for a spooktacular day of fun and fitness at the Issaquah Schools Foundation Monster Mash 5K on Saturday, October 25th, 2025, in beautiful Issaquah, King County! This family-friendly event invites participants of all ages and abilities to join in the excitement while supporting local students in all 27 Issaquah School District schools. The professionally chip-timed 5K features a flat, paved, out-and-back route that's perfect for both seasoned runners aiming for a personal best and families enjoying a leisurely walk together.

Dress up in your most creative costumes and embrace the festive spirit, as this beloved community event encourages participants to showcase their Halloween flair. With convenient onsite parking, phased start times, and a plethora of perks including free event photos, raffle tickets for prizes, and awards for top finishers in each age category, the Monster Mash 5K promises an unforgettable experience. Be sure to register by October 12th to secure your 2025 Monster Mash technical race tee and medal, as this event sells out every year. Don't miss out on being part of this incredible celebration of community and education!