Mountain High officials said the man was inbounds on a lit trail just after 6 p.m. when he hit a tree.
"He was on a normal run that everybody has been on during the day, just going down with friends, and unfortunately the incident occurred," said Kim Hermon, a spokeswoman for the resort.
It was unclear if he was wearing a helmet or if he was just learning to snowboard or was experienced.
According to the National Ski Areas Association, roughly 38 people in the U.S. die every year skiing or snowboarding.
Mountain High's trail map contains a responsibility code. It tells skiers and snowboarders to stay in control and be able to avoid people or objects.
The release of liability, printed below and on lift tickets, warns of the risk of injuries or death.
Most people on the slopes at Mountain High on Tuesday were unaware of the accident.