Block's Hoonigan Racing team confirmed his death in a statement on Instagram on Monday.
"Ken was a visionary, a pioneer and an icon. And most importantly, a father and husband. He will be incredibly missed," it said.
The accident occurred in Utah's Wasatch County and the Sheriff's Office said that Block was riding on a steep slope when the snowmobile upended and landed on top of him.
"He was pronounced deceased at the scene from injuries sustained in the accident," it said, adding that he was riding in a group but was alone when the accident occurred.