Race Discovery
Issaquah Schools Foundation Monster Mash 5K
Issaquah Schools Foundation Monster Mash 5K logo

Issaquah Schools Foundation Monster Mash 5K

Issaquah, Washington, United States View on map
Oct 24, 2026 (America/Los_Angeles local time)
Running

About this race

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. Convenient onsite parking, phased start times, and a professionally chip-timed course ensure a great experience for all. You’ll appreciate the flat, paved, out-and-back route whether you’re setting a new 5K PR or enjoying a brisk walk together as a family! Bring your creativity – festive costumes are encouraged! This event sells out every year, so don't wait to register! Every registration submitted by October 12th receives a 2026 Monster Mash technical race tee & medal. Registrants receive free event photos and raffle tickets for prizes as well! Placement awards for fastest finishing times will also be presented. See below for details. 

Pick your distance

Running

In-Person 5K

Technical Race Tee & Medal Included

Oct 24, 2026 5K 10:00 AM
$40.00
Open

Virtual 5K

Technical Race Tee & Medal Included. Pick-up at ISF required.

Oct 24, 2026 5K 10:00 AM
$40.00
Open

Typical race-day weather

Based on 4 years of Open-Meteo archive data for this event's race dates in Issaquah, plus the 3 days either side.

Temp (°C)
Minimum temperature (race-week average) 5.1° / Maximum temperature (race-week average) 12.7°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-week average) 2.1° / Maximum feels like — heat index / wind chill (race-week average) 12.5°
Peak wind (km/h)
Strongest wind of the day (race-week average)
16.3
Precip (mm)
Precipitation over the day (race-week average)
8.0mm
Humidity
Mean relative humidity (race-week average)
80.4%
Sunrise
Sunrise at the start line on October 24, 2026 (PDT)
Sunset
Sunset at the start line on October 24, 2026 (PDT)
Daylight
Hours between sunrise and sunset on race day
10h 23m

The sun rises at 7:40 AM and sets at 6:04 PM local time (PDT) in Issaquah on October 24, 2026 — 10h 23m of daylight.

Course

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

Reviews

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Results — Issaquah Schools Foundation Monster Mash 5K

2025 edition View Results

Other races near Issaquah

Different organizers, within 40 miles, in the next three months

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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 6 Issaquah events

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