Not without a few detours and/or going around the fences into officially closed parts. Most of the trail is opened but there are few short segments that are closed (they are changing slightly quite frequently as work progresses). Basically, it is completely opened from Brewster to Granite Springs and then from Briarcliff Manor to Van Cortlandt Park entrance. There are a few stretches closed between Granite Springs and Briarcliff Manor, entrance to Van Cortlandt Park is also closed.