Each person on a vessel that is underway must wear a USCG approved PFD. Each person occupying a sailboard must wear an approved PFD.
Boat Length
In Montana, vessels that are less than 26ft should abide by the Montana State laws on wearing of PFDs.
Compulsory PFD Requirements for Montana
Children under 12 years and sailboard operators younger than 15 years must be in a USCG approved PFD at all times. All PFDs must fit properly and be in serviceable condition.
Exceptions when a Life Jacket does not need to be worn
There are no exceptions for when passengers cannot wear a personal floatation device.
Disclaimer: The information presented here is meant to be a general reference for educational purposes. Please check with your state for the most up to date information and any current changes in the laws. Source: BoatUS