NORTH FRONTENAC, Ont. - Provincial police say two men have died in separate all-terrain vehicle collisions.

They say the first collision happened in South Frontenac, Ont., on Friday night.

OPP say the ATV collided with a tree, and the driver, 39-year-old Derek John Poulin of Kingston, Ont., was pronounced dead on the scene.

The second collision happened early Saturday morning in North Frontenac, Ont., when two men were travelling on a side-by-side ATV.

Police say their vehicle also collided with a tree.

The driver -- 33-year-old Brian Golden of Belleville, Ont. -- was pronounced dead at the scene.