In 71 days · Sat, Oct 24, 2026
Don't let race day sneak up
One email during race week. That's it.
When
Saturday, October 24th, 2026
Where
4455 E Lake Sammamish Pkwy SE, Issaquah WA
Distance
5K
Typical weather
44–57°F · rain likely
See last 10 years
On this date: rain 5 of the last 10 years
2025
48–58°F
rain
2024
43–55°F
dry
2023
45–53°F
rain
2022
46–57°F
rain
2021
49–58°F
rain
2020
37–49°F
dry
2019
41–60°F
dry
2018
45–59°F
dry
2017
41–63°F
dry
2016
50–62°F
rain
Best months to race in Washington →
About this race
Event Details
- Date: October 24, 2026
- Location: 4455 E Lake Sammamish Pkwy SE, Issaquah, WA
- Race URL: Registration Link
About the Monster Mash 5K
- Objective: Help raise a MONSTROUS amount of support for local students!
- Community Event: A family-friendly event aimed at raising funds for programs that serve students attending all 27 ISD schools.
- Inclusivity: We welcome participants of all ages and abilities.
- Experience: Enjoy convenient onsite parking, phased start times, and a professionally chip-timed course!
Course Details
- Route: A flat, paved, out-and-back course perfect for setting a new 5K PR or a family walk.
- Costumes: Bring your creativity – festive costumes are encouraged!
Registration Information
- Deadline: Register by October 12th to receive a 2026 Monster Mash technical race tee & medal.
- Inclusions: Registrants receive free event photos and raffle tickets for prizes.
- Awards: Placement awards for the fastest finishing times will be presented.
- Selling Out: This event sells out every year, so don’t wait to register!
Course map
Train with a club
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