The Great South Bay 5K & Fun Run
About this race
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!
Pick your distance
Running
5k Run/Walk
Typical race-day weather
Based on 1 year of Open-Meteo archive data for this event's race dates in East Islip, plus the 3 days either side.
The sun rises at 5:37 AM and sets at 8:21 PM local time (EDT) in East Islip on July 18, 2026 — 14h 43m 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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Other races near East Islip
Different organizers, within 40 miles, in the next three months
Inclusion In Motion
Paws of War Family 5k Run/Walk
SUFFOLK COUNTY MARATHON
GREAT SOUTH BAY RUN
🏃 Plan Your Next Race in East Islip
Find upcoming events by distance:
- East Islip 5K Races 4 races
- East Islip Running Calendar 2026 4 races
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, 5 East Islip events
Spotted something wrong? Tell us and we'll fix it.