Sure, it’s been getting colder outside, but it’s still a little early for snowmobile season.

On Tuesday afternoon, an 18-year-old Loudon man was riding a snowmobile on private land when he struck a tree seriously injuring himself, according to New Hampshire Fish and Game.

The man, who was not wearing a helmet, sustained serious non-life-threatening injuries and was transported to Concord Hospital for treatment, conservation officers said.

“The primary cause of the accident appears to be operator inexperience, speed, and unfavorable riding conditions,” Fish and Game officials said.

They added a few words of caution.

“Fish and Game Conservation Officers would like to remind all riders that operating snowmobiles without adequate snow cover is dangerous and not recommended, to always wear appropriate safety gear, and operate at safe speeds for existing conditions.”