Utah Highway Patrol officials say 55-year-old Stephen Trottier of La Mirada left the road and hit the tree north of Vernal a little before 5 p.m. Wednesday.
Authorities say his motorcycle flipped and Trottier was thrown 15 feet.
Troopers say Trottier was flown to a hospital but died early Thursday morning.
Officials say it's not clear why Trottier went off the road.
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