Issaquah Schools Foundation Monster Mash 5K
Issaquah Schools Foundation Monster Mash 5K is a running race on October 24, 2026 in Issaquah, WA, with an entry fee of $35.
- Date
- October 24, 2026 (93 days to go)
- Price
- $35
- Sport
- Running
From the Organizer
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.
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
58°
Typical Low
45°
Chance of Rain
51%
Based on US Climate Normals data from Renton Muni Ap, 9 mi from the venue.
Host City
About Issaquah, WA
Population
39,472
as of 2023
City Elevation
506 ft
Nearest Airport
SEA
Seattle–Tacoma International Airport · 15 mi
Time Zone
Pacific Time
From Endurance Grid
A mid-size host city. Enough lodging and amenities to keep race weekend easy, without big-city sprawl.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Issaquah Schools Foundation Monster Mash 5K, put it on the calendar, and turn “someday” into a start date.
93
Days to train
- Race
- Issaquah Schools Foundation Monster Mash 5K
- Date
- October 24, 2026
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From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it’s the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are an accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Coming Up
More Running races near Issaquah, WA
Cougar Mountain Trail Run Series (August)
5K · Marathon · From $40 · Sky Country Trailhead
5 miles away
Seattle Torch Relay
5K · 7401 164th Ave NE
8 miles away
Run with the Fishes Annual 5K, 10K, & Kids' Fun Run
1K · 5K · 10K · From $20 · 2182 NW Sammamish Rd.
5 miles away
Hope and Heroes Run
5K · 10K · From $2 · 6046 W Lake Sammamish PKWY NE
7 miles away
Plan your trip
Make it a Racecation
Coming from out of town? There's more to Issaquah than race day. We'll help you line up nearby lodging, flights, a rental car, and things to do so you can make the most of your racecation.
Plan your trip to IssaquahFrequently Asked Questions (FAQs)
What is the Issaquah Schools Foundation Monster Mash 5K?+
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Issaquah Schools Foundation Monster Mash 5K
Oct 24, 2026