Issaquah Schools Foundation Monster Mash 5K
Saturday, October 24, 2026, first start 10:00 AM, in Issaquah (4455 E Lake Sammamish Pkwy SE). Distances: 5K. Entry from $40.
- Date
- Saturday, October 24, 2026
- Start time
- 10:00 AM (earliest wave)
- Location
- 4455 E Lake Sammamish Pkwy SE, Issaquah, WA 98029
- Area
- Eastside & South King, Seattle
- Distances
- 5K
- Course
- Road or path
- Price
- $40 plus the platform's processing fee
- Next price increase
- None published
- Registration
- Open. Opened September 8, online signup closes Saturday, October 24, 2026
How to register
Registration is on RunSignup. Pick your distance, add any extras, and you'll get a confirmation email with your bib details.
Register on RunSignup →Race website
Course and race notes
Help us raise a MONSTROUS amount of support for local students on October 24th! ISF Monster Mash 5K is a community-based, family-friendly event that raises funds for programs that serve students attending all 27 ISD schools. We welcome all-ages and abilities.
From the race's own listing. Check the race website for the course map and parking.
Source: RunSignup public race API, refreshed 2026-10-17. Details can change; the registration page is the final word.