Motorcycle insurance in Montana

Montana is the rare state where the law does not make a motorcyclist carry insurance: MCA 61-6-303 lists motorcycles among the vehicles exempt from the compulsory-coverage rule that binds cars ^{[Montana Code Annotated 61-6-303, 2025]}. Skip a policy anyway and the exemption turns into a trap. Cause an at-fault crash uninsured and you pay the other party's injuries and property from your own pocket, then prove financial responsibility to keep your license. Coverage here runs $70 to $170 a year, the cheapest in the country.

How to shop for coverage in Montana

With no state mandate setting a floor, a Montana rider picks every number on the policy voluntarily, which is a reason to pick well rather than a reason to skip. Two coverages earn their place on Montana's long, empty highways: uninsured/underinsured motorist, because a driver who hits you out here may carry nothing, and roadside assistance, because a breakdown can strand you a long way from a tow. A financed cruiser forces the decision regardless of what the state does, since the lender requires collision and comprehensive as a condition of the loan. And a rider already carrying an SR-22 from a prior conviction has lost the exemption anyway: that filing is the state demanding proof of coverage.

Carriers confirmed to write motorcycle coverage in Montana include Allstate, GEICO, Harley-Davidson, Liberty Mutual, Markel, Nationwide, Progressive, State Farm, and USAA. That list is alphabetical, not a ranking — availability is a fact, not an endorsement, and several regional insurers write here too; confirm a carrier serves your ZIP when you quote.

Montana coverage requirements

Montana sets no motorcycle liability minimum, because it does not require a motorcyclist to be insured at all. When a rider does buy a policy, or has to prove financial responsibility after an at-fault crash, the reference figure is Montana's standard motor-vehicle floor of 25/50/20: $25,000 of bodily-injury coverage per person, $50,000 per accident, and $20,000 for property damage ^{[Montana Code Annotated 61-6-103, 2025]}.

That floor is thin for a serious wreck. $25,000 rarely covers one person's hospital stay, and once a limit is spent the injured party can come after your wages and your savings, which is the exact exposure the exemption leaves open. Liability also pays nothing toward your own bike or your own injuries; collision and comprehensive do that, and a lender will require both on a financed machine. The requirements guide breaks down what each layer covers, and the state directory shows how Montana's optional-coverage status compares with most other states, which do mandate it.

Montana helmet law

Montana requires a helmet only for riders and passengers under 18; at 18 and over, the choice is yours ^{[Montana Code Annotated 61-9-417, 2025]}. That is the law, not a recommendation. The insurance consequence is specific to the geography here: a head injury on a remote highway runs up medical bills fast, and with no PIP and no mandated coverage behind you, those bills land on your health insurance and your assets. A rider who takes the adult exemption has a sharper reason to carry medical-payments coverage, not a softer one, because it is often the only first-party medical protection on an uninsured or minimally insured bike.

Lane-splitting legality in Montana

Lane filtering is legal in Montana, one of only a handful of states to allow it. Since October 2021, a rider on a two-wheeled motorcycle may filter past a vehicle stopped or moving at 10 mph or less, in the same lane and direction, without exceeding 20 mph and only where the lane is wide enough to pass safely ^{[Montana Code Annotated 61-8-392, 2025]}. Those speed numbers are the whole rule: this is low-speed filtering through slow or stopped traffic, not California-style splitting at highway speed. Cross the 10-or-20 line and it becomes an ordinary moving violation, the kind that pushes a renewal quote up. The rule also stops at the state line. Neighboring Idaho and Wyoming have not adopted it, so a filtering habit that is legal in Bozeman is a citation in Coeur d'Alene.

Montana posts the lowest motorcycle premiums in the country. For a standard rider, full coverage averages about $170 a year and minimum coverage about $70, roughly half the $364 national full-coverage average (MoneyGeek, 2026). Holding a single rider constant nationwide is what seats Montana at the bottom of the table; your own bike, age, record, and limits move the real number. Because the floor is so low here, buying up to real limits costs little in absolute dollars, which is the argument for treating the exemption as a discount on good coverage rather than a reason to go without.

Montana-specific considerations

Distance is the coverage factor that separates Montana from almost anywhere else. Long stretches of highway, sparse traffic, and towns set far apart turn a routine breakdown or a crash with an uninsured driver into a genuine problem, which is why uninsured/underinsured motorist and roadside coverage carry more weight here than the price of the state's cheap policies suggests.

Winter is the other factor. Most Montana bikes come off the road for months, so a lay-up arrangement is worth confirming before you sign. The version you want drops collision during storage while keeping comprehensive, so a garaged bike stays covered against theft and fire without paying for collision it cannot use. The version you do not want suspends everything and leaves a gap.

Because Montana's rules genuinely differ from the national norm — optional coverage, legal filtering, an under-18 helmet line — confirm the current registration and endorsement requirements with the state rather than assuming your last state's rules carry over. The cost guide covers the levers that move a premium once you decide how much coverage to carry.