GREAT SOUTH BAY RUN
Decision scores
Six 0–100 scores telling you, at a glance, who this race is for.
Best for
About the Race
THE 41st ANNUAL NORTHWELL HEALTH GREAT SOUTH BAY RUN Features 3 USATF-certified run courses, choose from the 13.1 mile Half Marathon, a 10K Run, and a perfect 5k Family Fun Run. Each race begins and ends at the Bay Shore Marina Park, enjoy scenic courses as you run through the historic Bay Shore downtown area passing beautiful residential homes located by the Brightwaters Lakes, Cascades, and Canals. Finish with unobstructed views of Fire Island, and the Great South Bay!!
Course Profile
Course profile data unavailable for this race.
Course features
Accessibility & inclusion
Vibe & community
We don't have vibe tags for this race yet — organizers can claim the listing to add them.
History & past results
Past finisher times and year-over-year participation will appear here once the organizer publishes them.
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Common questions
How hard is the GREAT SOUTH BAY RUN Marathon?
We don't have a verified elevation profile yet — check the organizer's course map for the climb breakdown.
What should I wear?
Dress for ~10°F warmer than the standing temperature once you start running. Throwaway long-sleeve at the start, gloves and a hat for sub-50°F mornings, singlet plus visor when it climbs above 60°F. The race-day forecast above is the source of truth closer to the date.
When does it sell out?
No published deadline. Most races raise the entry fee in tiers and can sell out without warning — sign up early if you're committed.
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