The Montana Highway Patrol reports the crash occurred around 6:30 p.m. at mile marker 79.6, just south of Plains.
A 59-year-old Plains man was driving a Harley Davidson on Montana Highway 200 when he crossed the center line and struck a guardrail.
MHP reports the motorcycle continued west in the eastbound lanes for several hundred feet before diving into a ditch.
He was pronounced dead on the scene. According to MHP Dispatch, it’s believed the man was not wearing a helmet at the time of the crash.
Drugs and alcohol are not suspect and roads were dry at the time. The MHP is continuing to investigate the accident.
Story by Kent Luetzen