Montana Weigh Stations & Ag Inspection

When Montana makes you pull in

Montana weighs commercial trucks at 26,000 lb GVW and up. When a station is open you pull in unless PrePass or Drivewyze flashes green (MCA 61-10-141). Portable crews can weigh on engineered sites statewide, so a closed fixed scale is no free pass. Stations sit on I-90, I-94, I-15, and US-93. Skip an open scale and you face a misdemeanor citation plus a ride back for a full inspection. No produce inspection stations here.

Stations, bypass, and inspection

• Who must stop: Over a weight threshold
• Where the stations are: Stations sit on I-90, I-94, I-15, US-93, and US-2. Variable hours with lit signs; many are open by day and dark overnight. Portable scale crews can set up and weigh on engineered sites anywhere in the state.
• Bypass: PrePass and Drivewyze both cover Montana fixed weigh stations and mobile sites. A green light rolls you past an open station; livestock, oversize, overweight, and fuel tankers still pull in regardless of the signal.
• Ag / border inspection: No agricultural or produce inspection stations. Livestock and brand matters are handled off the highway, not at roadside pest checkpoints.
• Fine for passing an open station: Failing to stop or comply is a misdemeanor citation, and an officer can order you back to the scale for a full Level 1 inspection. Montana pins exact dollar amounts to overweight tickets rather than a fixed failure-to-stop fee, so treat the cost as a misdemeanor fine plus CSA and inspection exposure.

More for Montana