Great South Bay Half Marathon, 10K & 5K

Saturday, October 5, 2024 • Bay Shore, NY • Course Map

The waterfront areas of Long Island’s Great South Bay and the Fire Island National Seashore are the setting each October for the Northwell Health Great South Bay Run Half Marathon (formerly Entenmann’s before 2016), which also includes a 10K and 5K races that are both open to runners and walkers.

Starting from the Bay Shore Marina near Islip, a town on the southern shore of Long Island, the race takes participants through much of this beach town’s quaint, cozy downtown streets, including Main Street and past Walker Park and Gardiners County Park.

Along the course, which is largely fast and flat and run entirely along paved city streets, runners also are treated to views of the architectural beauty of homes along the Penataquit peninsula as well as nearby Brightwater’s scenic Cascade Lake and the Brighwaters Canal area.

The out-and-back race takes a zig-zag route through town, alternately taking runners close to the water and then back toward Main Street, and finishes back at the starting line at the Bay Shore Marina.

Participants are limited to three hours on the course, which must re-open after that time due to traffic restrictions. The races begin at 7:30 AM with the half marathon, followed by the 10K at 7:45 AM and the 5K at 8:00 AM. The 5K and 10K races are open to both runners and walkers, while the half marathon is for runners only.

Race Weather & Climate

Nestled along Long Island’s southern shoreline overlooking the Great South Bay, roughly 50 miles east of New York City, Bay Shore typically sees cool to mild weather in September, which has brought record temperatures as low as 38°F (in 1997) and as high as 92°F (in 1998).

On race day (Oct. 5), the average low is 54ºF and the average high is 73ºF.

Past Results

Course Map

See the race route map for the Great South Bay Run Half Marathon, 10K and 5K here.

Starting Time

  • 7:30 AM – half marathon
  • 7:45 AM – 10K
  • 8:00 AM – 5K


  • $65 – $95 for the half marathon
  • $50 – $75 for the 10K
  • $38 – $55 for the 5K


To reserve your spot in the 2024 running of New York’s Northwell Health Great South Bay Half Marathon, 10K and 5K, register online at here.

Official Race Website


Ever run in the Northwell Health Great South Bay Half Marathon race? Share your impressions here, or post your review in the Comments below.

See more races in: October, New York

1 comment… add one
  • Renee Guerrieri August 24, 2017, 12:00 pm

    My company is inquiring about becoming a sponsor for any of the local races. Is there a contact I could have to look into this? We are a Long Island based construction company.

    Thank you for your time and help,
    Renee Guerrieri 631-567-3144


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