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Oversize Load Permit Requirements — Montana
Legal size/weight limits, escort thresholds, travel restrictions, and permit office contact for Montana.
These figures are a reference summary of publicly published state rules, not a substitute for a state-issued permit and not legal advice. Rules change — always confirm current limits and requirements directly with the state permit office before you plan or run a move. Last verified: 2026-06-28. Oversize Ops is NOT responsible and CANNOT be held liable for decisions made from this reference. Official source ↗
Legal Maximum Dimensions (no permit required)
- Width
- 8.5ft (102in)
- Height
- 14ft (168in)
- Length
- 53ft
- Gross Weight
- 80,000 lbs
- Single Axle
- 20,000 lbs
- Tandem Axle
- 34,000 lbs
Escort / Pilot Car Thresholds (see glossary for terms, certification requirements for the driver)
- Front escort required over
- 12.5ft wide
- Rear escort required over
- 12.5ft wide
- Both escorts required over
- 16.5ft wide
- Height escort required over
- 17ft tall
Non-interstate: 1 front escort >12ft6in to 16ft6in; 1 front+rear >16ft6in to 18ft; 2 front+1 rear >18ft to 24ft; 2 front+2 rear >24ft. Interstate: 1 rear >12ft6in; 2 rear (side by side) >18ft. Height: front pole car >17ft; both escorts >24ft.
Travel Restrictions
- Night travel
- Generally restricted
- Weekend travel
- Generally allowed
- Sunday travel
- Generally allowed
Night travel restricted on most oversize loads. Daylight travel required for widest loads.
Holiday blackouts: Major US holidays.
Superload Thresholds
- Width over
- 18ft
- Length over
- 150ft
- Weight over
- 200,000 lbs
Estimated Permit Cost Verify before relying
$10 (0–100mi) / $30 (101–199mi) / $50 (200+mi)
Typical processing: 72-hour validity
⚠ Montana can adjust permit fees administratively without a statute amendment, so this carries real staleness risk despite the citation.
Source: §61-10-125 MCA — verify current fee with the permit office before budgeting a move.
Permit fee only — does not include escort/pilot-car service costs (market-rate, arranged separately) or third-party permit-service fees. This is an estimate for planning purposes, not a quote.
Get a Permit
- Online portal
- https://etrips.mtmdt.us/
- Phone
- 1-406-444-6130
Montana allows 14ft legal height without permit on many routes. Wide open roads with fewer urban restrictions.
Planning a move through Montana?
Plan a truck-legal route that checks bridges and construction, or find a vetted transporter or escort.
Try the Route Planner Find an Escort