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Montana Oversize Permits

Below is some important oversize permit regulation information for the state of Montana.

In Montana, you need an oversize permit if your vehicle exceeds 8’6″ wide, 14’0″ high, 75’0″ long or 80,000 pounds. 

If you need to apply for a Montana oversize permit, call (888) 737-6483 now or contact us. 

LEGAL DIMENSIONS & WEIGHTS​
Legal Width:8'6
Legal Height:14'0
Legal Length:
  • Single unit
    • 55’0
  • Semi-trailer
    • 53’0
  • Auto Transporter
    • 75’0
  • Tractor/Truck w/Semi-trailer
    • 75’0
Legal Overhang Front:3'0 (auto/boat trans only)
Legal Overhang Rear:4'0 (auto/boat trans only)
Legal Trailer Length:53’0
Legal Weight Gross:80,000 lbs.
Legal Weight Single:20,000 lbs.
Legal Weight Tandem:34,000 lbs.
Legal Weight Tridem:42,000 lbs.
Legal Weight Doubles:34,000 lbs.
Legal Weight Triples:42,000 lbs.
PERMIT FEES​
Permit Fee/Legal Weight:$10.00
Permit Fee/Overweight:Refer to Axle Weight Fee link below
Mileage Fees:Refer to Axle Weight Fee link below
Annual Fees:
  • Oversize
    • $75.00
  • Overlength Double Combination
    • $125.00
  • Non-divisible  (length only)
    • $125.00
Additional Fees:Refer to Monthly Weight Fee link below
Important Links:

Axle Weight Fee Chart

Monthly Weight Fee Chart

AGENCY GENERAL INFO​
Phone:406-444-6130
Fax:406-444-7670
Email:[email protected]
Website:

https://www.mdt.mt.gov

Hours of Operation:7:30 am - 5:00 pm Central
Permit Valid For: 5 Days

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