Permits Canada obtains oversize and overweight permits for Montana for trucks and loads over the legal width, height, length or weight.
Montana legal dimensions and weight
A truck and load within these limits needs no oversize or overweight permit in Montana.
| Width | 8 ft 6 in (102 in) |
|---|---|
| Height | 14 ft |
| Length | 53 ft trailer (no overall length limit for tractor + 53 ft trailer); 75 ft overall when load extends beyond trailer |
Montana oversize permit rules
| Permits offered | Single trip, term (annual) over-dimensional, GVW fee permit, superload |
|---|---|
| Escorts | Non-interstate: 1 front pilot over 12 ft 6 in wide; front + rear over 16 ft 6 in; 2 front + 1 rear over 18 ft. Interstate: 1 rear pilot over 16 ft 6 in; 2 rear over 18 ft. Front pilot with height pole over 17 ft high |
| Travel times | Interstate: 24/7 up to 18 ft wide. Non-interstate: 24/7 up to 10 ft wide, 150 ft long, 15 ft 6 in high; larger loads daylight only. Holiday and holiday-weekend limits apply; non-interstate loads over 18 ft wide, 150 ft long or 17 ft high cannot travel on weekends |
Pilot vehicles are not required on the interstate below 16 ft 6 in wide unless the permit adds them.
Getting your permit with Permits Canada
- Send us the online oversize / overweight application with your truck, trailer, load dimensions and route.
- A permit agent applies for your Montana permit and checks the route conditions.
- Your permit arrives by email with its travel conditions. Oversize and overweight permits can take longer, since the authorities review each application.
Our fee is $40 to $50 CAD per permit, plus the Montana state fee, which depends on the dimensions, weight and route.
Also need temporary registration or fuel tax coverage? See Montana trip & fuel permits.
Montana oversize permit questions
When is an oversize permit required in Montana?
When the truck or load exceeds the Montana legal limits: width 8 ft 6 in (102 in), height 14 ft, length 53 ft trailer (no overall length limit for tractor + 53 ft trailer); 75 ft overall when load extends beyond trailer.
When are pilot or escort vehicles required in Montana?
Non-interstate: 1 front pilot over 12 ft 6 in wide; front + rear over 16 ft 6 in; 2 front + 1 rear over 18 ft. Interstate: 1 rear pilot over 16 ft 6 in; 2 rear over 18 ft. Front pilot with height pole over 17 ft high.
Can oversize loads travel at night or on weekends in Montana?
Interstate: 24/7 up to 18 ft wide. Non-interstate: 24/7 up to 10 ft wide, 150 ft long, 15 ft 6 in high; larger loads daylight only. Holiday and holiday-weekend limits apply; non-interstate loads over 18 ft wide, 150 ft long or 17 ft high cannot travel on weekends.
How much does a Montana oversize permit cost?
Permits Canada charges $40 to $50 CAD per permit, plus the Montana state fee, which depends on the dimensions, weight and route.
Last reviewed October 2026. Rules change; your permit agent confirms them for each move. All provinces and states