Montana oversize load permits
Montana allows 14'0" unpermitted, which 20 states do. The other 26 cap at 13'6" — so a 14-foot load legal here needs a permit the moment it crosses into most of them.
Montana permit requirements
The same seven sections for every state, so two states can be compared without re-learning the layout.
Permit required above
Exceed any one of these in Montana and the load needs a permit. No overall cap where the trailer is 53' or less — a tractor-semi is length-legal at any overall length. Permigo files it for a flat $20, with the state's own fee billed at cost.
Front overhang is capped at 3'. Exceed it and Montana requires a permit.
Filed from Houston, TX. A permit agent answers +1 (786) 494-6912, 7am–7pm CT, 7 days; no card needed for a quote.
Axle limits
Escorts by road type
Police escort at the state’s discretion.
Superload above
Allow about 2 business days for review.
Movement windows
| Situation | Window |
|---|---|
| Interstate ≤18' wide | 24/7 — weekends, holidays, holiday weekends included (#1a/#1c) |
| Interstate >18' wide | no holiday or holiday-weekend travel (#1c) |
| Non-interstate ≤10'W · ≤150'L · ≤15'6"H | 24/7, holidays included (#1b/#1d) |
| Non-interstate >10'W (to 12'6") or >150'L or >15'6"H | daylight only — ½ hr before sunrise → ½ hr after sunset; >10'–12'6"W keeps daylight holiday travel (#1d) |
| Non-interstate >12'6"W (or >150'L / >15'6"H) | no holiday / holiday-weekend travel (#1d) |
| Non-interstate >18'W / >150'L / >17'H | no weekend travel (#1e) |
| Holidays | New Year's · Memorial · July 4 · Labor · Thanksgiving (blocks Thu–Sun) · Christmas; Fri/Sat holiday blocks Fri–Sun, Sun/Mon blocks Sat–Mon, midweek blocks that day |
| Overweight loads | max 55 mph or posted, whichever less; 10 mph on restricted bridges; must enter open weigh stations (#33) |
| Superloads | same windows; MDT may limit days/hours per permit; MCS administrator may waive any travel restriction |
| Severe conditions | no travel when the route is under severe driving conditions (#39) |
Travel restrictions
Other published tables
No additional tables published for this state.
Primary source: MDT Motor Carrier Services — permits ↗
Every figure on this page was checked against it on August 4, 2026.
Get Montana priced and filed
Send the route and a permit agent calls you back with Montana’s fee, any other state on the way, and one total. Filed from Houston, TX; we answer +1 (786) 494-6912, 7am–7pm CT, 7 days.
Already know the load? Start an order in FleetLynk, the filing app behind Permigo — or send the form and we set it up for you.
States that border Montana
Limits change at the line. One order covers every state on your route.
Montana oversize permits, answered
Do I need an oversize permit in Montana?
You need a permit in Montana once the load exceeds any one of these: 8'6" wide, 14'0" high, 3' of front overhang, or 80,000 lb gross. There is no overall length cap on a normal tractor-semitrailer — the trailer itself is capped at 53' instead. Axle limits apply too — 20,000 lb on a single axle and 34,000 lb on a tandem.
When does Montana require an escort?
Montana requires no escort below 16'6" wide. Above that the requirement depends on the road type as well as the dimension, which is why the same load can need a front escort on a two-lane and a rear escort on a multilane.
Can I move an oversize load at night in Montana?
Daylight only above 10' wide. There is no general weekend blackout. There is no holiday blackout.
What counts as a superload in Montana?
A load over 18' wide, over 17'0" high, over 150' long is handled as a superload in Montana. Allow about 2 business days for review.
How much does a Montana oversize permit cost?
Permigo charges a flat $20 service fee per state permit. Montana's own permit fee is billed at cost on the same invoice, itemised, with nothing added. Call +1 (786) 494-6912 and we will price your exact route.
What happens if I move without a Montana permit?
Moving above Montana's limits without a permit is a violation, not a paperwork gap. The load can be stopped at a scale or by a trooper and held until a permit is issued, the fine is set by Montana and the citing officer, and a pattern of violations follows the carrier's safety record. If you are not sure the load needs one, when you need an oversize permit walks through the triggers.
Which kind of Montana permit do I need?
Most moves take a single-trip permit: one load, one route, a set number of days. Many states also sell annual or blanket permits for loads that stay within routine dimensions; whether Montana does, and for which loads, is on the state's own permit page. A superload is permitted separately and reviewed by the state — the thresholds are in the answer above. Permigo files whichever kind the load needs at the same $20 flat fee; what Montana itself charges is on the cost guide.
Is a Montana oversize permit the same as a Montana truck permit?
No. A "truck permit" usually means the paperwork a truck needs to cross Montana at all — a trip permit, a fuel permit (IFTA) or IRP plates — which the state's motor-carrier office issues. An oversize or overweight permit covers one load that exceeds Montana's legal size or weight, and that is what Permigo files.
Also useful: when you need a permit, pilot car requirements by state, and the interactive map of all 48 states.
Moving through Montana?
$20 flat per state permit, the state's fee at cost. A permit agent answers, 7am–7pm CT.