The inaugural Suffolk County Marathon kicks off Sunday at 8 a.m. at Heckscher State Park.
There's a 13.1-mile half marathon that winds through downtown Oakdale and to the Great South Bay and a 26.2-mile full marathon that crosses Sayville, Bayport and Patchogue. Both routes loop back to the park in East Islip.
All participants will receive a medal, and registration includes a ticket to A Taste of Long Island festival, scheduled to begin at 9 a.m. at Heckscher. The event will feature live music and food from local restaurants.
Proceeds from the marathon will support veterans services, officials said.
To accommodate the marathon, Montauk Highway will be closed to traffic from Heckscher State Parkway in Great River to Rider Avenue in Patchogue from 7 a.m. to 2 p.m. The northbound parkway will be closed during that period from the park to Montauk Highway.
Drivers may cross Montauk at 10 intersections on the racecourse during designated times. Those intersections include Bridle Way and Oakdale-Bohemia Road in Oakdale, Greene Avenue in Sayville and Bayport Avenue in Bayport.
Suffolk police will direct traffic across the highway at the intersections wherever gaps in runners present themselves, county officials said.
There will be no parking on that stretch of Montauk from 4 a.m. to 2 p.m., and vehicles left on the highway will be towed, officials said.
Friends and family can watch the runners from several designated spectator areas in Sayville, Patchogue and Oakdale.
Runners can still register for the marathon at John A. Danzi Athletic Center at St. Joseph's College in Patchogue from 10 a.m. to 3 p.m. Saturday.
For the half marathon, registration is $80 or $40 for active duty military and veterans. The full marathon fee is $90 or $50 for active duty military and veterans. For more information, visit suffolkmarathon.com.