Montana trailer registration carries a single rear plate and a fee set by the declared weight or the length. A trailer under 6,000 pounds pays $61.25 once, and a travel trailer under 16 feet pays $72 once. The class splits a utility trailer, a boat trailer and a camper into their own lines.
Montana trailer plates follow a short path that most owners finish in one visit. This page covers the single rear plate, the fees by weight and length, the one-time route and the annual route, and the steps to register a new or used trailer.
How to Register a Montana Trailer
A trailer registration starts with the title or the manufacturer’s statement of origin, a photo ID, proof of the Montana address and proof of insurance where the state asks for it. Bring the papers to the county treasurer for the county where the trailer is kept, and the office records the vehicle identification number and the declared weight or the length. Pay the fee, then the county issues the single rear plate. A temporary permit covers the wait if the plate is not on hand.
- Papers — title or origin statement, photo ID, proof of address.
- Office — the county treasurer for the county where the trailer is kept.
- Fee — $61.25 or $148.25 by weight, or $72 or $152 by length.
- Plate — one rear plate, plus a temporary permit if needed.
https://mvdmt.gov/license-plate-information/The Single Rear Plate Rule
A trailer carries one plate at the rear, and the state does not issue a front plate for a trailer. The face runs narrow, and the county code leads the serial on the standard runs. A trailer that hides the plate behind a ramp or a load can draw a question, so keep the face clear and readable. A trailer plate mounts on the rear frame or a bracket near the tail light, and the plate should sit square. A plate that catches road spray can dull the face, so a rinse now and then keeps it clear. A lit bracket helps at night and keeps the tag visible in traffic.
Trailer Fees by Weight
A trailer, a semitrailer and a pole trailer pay a one-time fee based on the declared weight. A trailer declared under 6,000 pounds pays $61.25, and one at 6,000 pounds or more pays $148.25. The declared weight sits on the registration and sets the line. A trailer registered under the annual route pays $30 under 6,000 pounds and $60 at or above that mark. A driver who plans to keep the trailer for years can compare the one-time figure against the yearly one. The one-time route often wins for a trailer held long term. A driver who changes the declared weight updates the record at the county office. A heavier load than the declared figure can carry a penalty, so declare the weight the trailer will actually haul. The Montana registration fee breakdown lists the trailer lines next to the other classes.
Travel Trailer Fees by Length
A travel trailer pays a one-time fee by length. A unit under 16 feet runs $72, and a unit 16 feet or longer runs $152. The length sits on the title and sets the line, and the fee covers the trailer rather than the tow vehicle. A camper that folds down or a teardrop trailer falls under the travel trailer class in most cases. A motor home, by contrast, registers as a vehicle rather than a trailer and pays the motor home rate. A driver who tows a camper should check the class before the visit. A travel trailer carries its own plate and registration, separate from the tow vehicle. A driver who sells the tow vehicle keeps the trailer and its plate, and the trailer record continues on its own. The county ties the trailer to the owner rather than the truck.
One-Time Route and the Annual Route
A trailer under the one-time route pays once and skips the yearly cycle. The plate stays with the trailer until a transfer, and the owner keeps the same tag across the years. A trailer held long term fits that route well. A trailer under the annual route renews each year and pays the smaller yearly figure. A driver who tows a trailer for a single season may prefer that route. Ask the county treasurer which route fits the trailer and the way it is used. A trailer that passes to a new owner restarts the cycle, and the new owner pays the fee again on the transfer. A trailer that changes weight updates the record too, and it may move between the fee lines. Keep the declared weight current to stay on the right line.
Buying a Used Trailer
A used-trailer buyer should match the title to the vehicle identification number on the frame. A trailer that lacks a title may need a bonded title before it registers. A mismatch between the plate, the title and the frame number is a reason to pause the deal. Read the county code on the plate against the Montana county code list to see which office holds the record. The seller hands over the signed title, and the buyer registers the trailer in the buyer’s county. The one-time fee applies on the transfer. A trailer with a lien needs the lender’s release before the transfer closes. A buyer who pays the seller should hold the signed title and the release in hand. The county treasurer can confirm the title is clean before the money changes hands.
Boat and Specialty Trailers
A boat trailer registers under the trailer class and pays the weight-based fee, and the boat itself carries its own registration when the state asks for it. A trailer that hauls a personal watercraft or a small motorboat falls under the same class. The plate on the trailer and the number on the boat sit apart. A specialty trailer, such as a car hauler or a horse trailer, follows the weight line too. A heavier hauler declared over 6,000 pounds pays the higher one-time figure. A driver who tows a heavy trailer should declare the weight the trailer will actually carry. A trailer that carries a load for a business may fall under a commercial class, and the county confirms the line. A farm trailer may take a farm rate in some counties. Ask the office which class fits the trailer and the way it is used.
Farm and Commercial Trailers
A farm trailer that hauls produce or livestock can fall under a farm class in some counties, and the rate runs lower than a commercial line. The owner files the farm papers with the county, and the office sets the class. A trailer that doubles for a business should stay on the commercial line. A commercial trailer that hauls for hire pays the standard weight line, and a semitrailer on an apportioned route reports the miles across the states it runs. The apportioned route splits the fee across the states, and the owner files one report rather than several. A driver who switches a trailer from personal to commercial use updates the record at the county office. The class change can move the fee, and the county updates the plate record. Keep the use current to stay on the right line.
Trailer Plate Placement and Visibility
A trailer plate should sit square on the rear and clear of a ramp, a load and a spare tire. A plate that hides behind gear can draw a stop, and a plate that catches road spray can dull the face. A lit bracket keeps the tag readable after dark. A driver who lowers a tailgate or folds a ramp should check that the plate still shows. A plate blocked by a folded ramp is no plate in the eyes of an officer. Mount the plate where the tailgate and the load leave it clear. A bent or faded plate is replaced at the county office, and the replacement carries a $10 fee, or $15 to hold the same serial. A trailer that spends winters in storage can still fade the face, so check the plate each spring before the first tow of the year.
Registering a Homemade Trailer
A homemade trailer registers through a different path, since it carries no manufacturer’s statement of origin. The owner requests a title for the built trailer, and the state may ask for a VIN inspection before the record opens. The county points to the current form. A builder should keep receipts for the materials and the axle, since the county may ask for proof of the build. A clear description of the length and the declared weight helps the record. The one-time weight fee applies once the trailer registers. A homemade trailer then takes a single rear plate like any other trailer, and the county code leads the serial. The Montana license plate numbers page shows how the serial reads, and the Montana license plate types page lists the classes that take one plate.
Towing Rules and the Plate
A trailer plate covers the trailer rather than the tow vehicle, and the tow vehicle carries its own pair of plates. A driver who tows a heavy load should check the combined weight against the tow vehicle’s rating, and the trailer’s brakes and lights against the rules for the weight. A plate that reads clearly is only part of a safe tow. A trailer with a load that sticks out past the sides or the rear may need a flag or a light, and the rules follow the overhang. A driver who hauls wide or long gear should check the current limits before the trip. The plate stays on the rear frame, clear of the load. A driver who tows across state lines should confirm the trailer plate meets the other state’s rules. Most states accept a Montana trailer plate at the border, and a few ask for a temporary permit for a long stay. A quick check before a cross-country tow saves a stop.
Renewal and the One-Time Route
A trailer under the one-time route skips the yearly renewal, and the plate stays with the trailer until a transfer. A trailer under the annual route renews each year on the anniversary month, and the county mails a notice ahead of the date. A long-held trailer fits the one-time route, and a seasonal one fits the annual route. A trailer that passes to a new owner restarts the cycle, and the new owner pays the fee again. A trailer that changes weight updates the record and may move between the fee lines. Keep the declared weight current so the record stays on the right line. A lost or damaged trailer plate is replaced at the county office, and the replacement carries a $10 fee, or $15 to hold the same serial. A stolen plate is reported to the police and the county. Keep the rear plate clean and the bolts tight, since a missing trailer plate draws a stop.
What the County Code Means on a Trailer Plate
The county code on a trailer plate names the office that registered the trailer, and it follows the same list as a car plate. A trailer that opens with 6 points to Gallatin County, and one that opens with 3 points to Yellowstone County. The code stays with the trailer through a transfer. A driver who moves inside the state keeps the trailer plate through the current term, and the new county sets the local lines at the next renewal. The code on the plate does not change, since it rides with the serial rather than the address. The county treasurer updates the record without a new plate. A driver who reads a trailer plate can pair the code with a search to confirm the record. The county code narrows the office, and the serial finishes the match. A mismatch between the plate and the paperwork is worth a question before a sale.
Trailer Storage and the Plate
A trailer that sits unused through a season keeps its plate and its record, and the owner does not renew the one-time route. A trailer on the annual route still renews each year even when it sits in storage. A driver who stores a trailer should confirm the route with the county so a lapsed plate does not surprise the first tow of the season. A trailer parked on a public street still needs a current plate, since the tag marks the registration rather than the use. A trailer stored on private land keeps its record without a public street concern. Keep the plate clean through storage, and check it before the first trip. A driver who sells a stored trailer hands over the signed title and the plate, and the buyer registers it in the buyer’s county. The one-time fee applies on the transfer, and the new owner sets the declared weight. The county ties the trailer to the new owner at that point.
Frequently Asked Questions
These five questions come up most often around a Montana trailer plate. Each answer stays short so the point lands fast.
How many plates does a Montana trailer need?
One, mounted at the rear. The state does not issue a front plate for a trailer, and the face runs narrow. Keep the plate clear of ramps and loads.
How much is a Montana trailer registration?
A trailer under 6,000 pounds declared weight pays $61.25 once, and one at 6,000 pounds or more pays $148.25. A travel trailer pays $72 under 16 feet and $152 at 16 feet or longer.
Does a trailer renew every year?
Not under the one-time route. A trailer registered under the annual route renews each year at $30 or $60 by weight. A long-held trailer fits the one-time route well.
Do I need a title to register a trailer?
Yes, for most trailers. A trailer that lacks a title may need a bonded title before it registers. Bring the title or the origin statement to the county office.
Can I move a trailer plate to a new trailer?
Yes. A plate transfer ties the tag to the new trailer through the county office. The fee applies on the transfer, and the declared weight sets the line for the new unit.