The Great South Bay 5K & Fun Run
The Great South Bay 5K & Fun Run is a running race on July 18, 2026 in East Islip, NY.
- Date
- July 18, 2026 (1 day to go)
- Sport
- Running
From the Organizer
Welcome to the Great South Bay 5K & Fun Run, hosted at the beautiful and historic Heckscher State Park in East Islip, NY!
Our mission is to bring the Suffolk County community together for a premier day of fitness, family fun, and environmental awareness. This year, we are proud to support local green initiatives and state park preservation efforts across the South Shore.
An event of this scale is only possible through the generous support of our local business sponsors. We would like to recognize and thank the key organizations helping us bring this event to life:
Suffolk Water Heater Pros: Our headline presenting sponsor, recognized across Long Island as the premier authority for rapid-response emergency plumbing and professional water heater replacement in Islip, NY, and surrounding townships.
Suffolk Drain and Sewer: Serving as our official course safety and logistics sponsor, they keep Suffolk County moving with 24/7 emergency drain cleaning, main sewer line clearing, and root-removal services.
Fusion MMA & Kickboxing: Providing our pre-race warm-up and stretch zones! Located in Port Jefferson Station, they are the area's top destination for elite fitness, kickboxing, and martial arts training.
Perna Masonry: Powering our finish line setup and pavilion staging, they are the go-to local experts for custom brickwork, masonry repairs, concrete patios, and driveway installations.
Event Details & Course
The fast, flat, and scenic 5K (3.1-mile) course takes runners on a paved loop through Heckscher State Park, offering breathtaking panoramic views of the Great South Bay and the Fire Island Lighthouse.
Location: Heckscher State Park, 1 Heckscher State Parkway, East Islip, NY 11730 (Field 1 Area)
Runner Check-In: 7:30 AM
5K Start Time: 9:00 AM
Kids Fun Run: 8:30 AM
Register today to secure your custom race t-shirt, finisher medal, and post-race refreshments at the Overlook Pavilion!
Events
Weather
Race-Day Forecast
Live forecast from the U.S. National Weather Service.
Race Day
Saturday, 7/18
High
79°
Low
72°
Conditions
Smoke then areas of smoke
Chance of Rain
85%
Wind
6 to 17 mph
Host City
About East Islip, NY
City Elevation
10 ft
Nearest Airport
ISP
Long Island MacArthur Airport · 6 mi
Major Hub
JFK
John F. Kennedy International Airport · 32 mi
Time Zone
Eastern Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at The Great South Bay 5K & Fun Run, put it on the calendar, and turn “someday” into a start date.
1
Day to train
- Race
- The Great South Bay 5K & Fun Run
- Date
- July 18, 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
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Race to End Alz 5K
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Inclusion In Motion
From $45 · 1 Heckscher State Pkwy
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Plan your trip
Make it a Racecation
Coming from out of town? There's more to East Islip 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 East IslipFrequently Asked Questions (FAQs)
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The Great South Bay 5K & Fun Run
Jul 18, 2026