Issaquah Schools Foundation Monster Mash 5K
- Date
- October 24, 2026
- Distance
- In-Person 5K · Virtual 5K
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
57°
Typical Low
42°
Chance of Rain
58%
Based on US Climate Normals data from Snoqualmie Falls, 8 mi from the venue.
Host City
About Issaquah, WA
Population
39,472
as of 2023
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.
138
Days to train
- Race
- Issaquah Schools Foundation Monster Mash 5K
- Date
- October 24, 2026
Coming Up
More Running races near Issaquah, WA
Fall City Day Run 2026
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Maple Hills 4th of July 5K
5K
8 miles away
Hot Dog Hustle 5K
5K
8 miles away
Bare Buns Fun Run
Less than a mile away
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 the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the Issaquah Schools Foundation Monster Mash 5K?
- Issaquah Schools Foundation Monster Mash 5K is a running race held in Issaquah, Washington on October 24, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the Issaquah Schools Foundation Monster Mash 5K?
- Saturday, October 24, 2026 in Issaquah, Washington at 4455 E Lake Sammamish Pkwy SE, Issaquah, WA. Check the event page for exact start times and wave schedules.
- How do I register for the Issaquah Schools Foundation Monster Mash 5K?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
Issaquah Schools Foundation Monster Mash 5K
Oct 24, 2026