The crash happened on ITS 87 around 10:30 a.m., West Forks firefighters said in a post on their Facebook page.
Crews had to rescue the snowmobiler out of a ravine.
Officials said they believed the snowmobiler was seriously injured. An update on the person's medical condition was not immediately available.
West Forks firefighters reminded snowmobile riders to slow down, especially on unfamiliar trails.