The fire broke out in Great Kills Park near Mill Road and Kissam Avenue in the Oakwood section at about 1:15 p.m.
The FDNY said no structures are in danger at this time, and after several hours, crews were able to get the fire under control.
Eyewitness News viewer Charlie DePrimo shot this video:
The fire is showing up on AccuTrack Radar, too:
The fire spread to five alarms, aided by strong, sustained winds blowing out of the west at 18-23 mph.