Cow Harbor Weekend is a celebration of the Northport Community! . The local Village population more than doubles Saturday, September 23rd with the running of the Great Cow Harbor 10-Kilometer Run that hosts 5,000 runners and twice as many spectators. . Cow Harbor Day, which will be taking place on Sunday, September 24th, is a day where Main Street and the parking lots near the water are all closed and the cars give way to the 25,0000+ pedestrians that converge on Northport. . #northport #nptchamber #northportchamberofcommerce #longisland #northportny #cowharborweekend #cowharborrace