ID➜MT

The Route: Idaho to Montana Trucking

This guide outlines a common trucking route from Idaho to Montana, focusing on efficient Interstate usage and potential considerations for drivers.

The most direct and commonly used route between Idaho and Montana utilizes Interstate 90 (I-90). Depending on your origin point in Idaho, you will likely access I-90 either from the west or by taking connecting state routes to meet the Interstate.

From Western Idaho: Begin by heading east on I-90. The highway generally follows a scenic route through mountainous terrain. Be prepared for varying elevation changes and potentially winding roads, especially as you approach the Idaho/Montana state line.

From Southern Idaho: If originating in Southern Idaho, you will likely need to take a combination of US Highways (US-20, US-26, or I-84 depending on your location) to reach I-90 near Missoula, MT. Carefully plan your route using a GPS or mapping software designed for commercial vehicles to account for any weight restrictions or low clearances on these connecting routes.

I-90 Eastbound: Once on I-90 Eastbound, continue until your designated destination in Montana. Key Montana cities along I-90 include Missoula, Butte, Bozeman, and Billings. Plan your rest stops and fuel stops accordingly, considering distances between towns can be significant.

Compliance & Permits

When operating a commercial vehicle between Idaho and Montana, adherence to size, weight, and permit regulations is crucial.

Weigh Stations & Ports of Entry: Be prepared to encounter weigh stations along I-90 in both Idaho and Montana. Locations can vary and may be temporarily closed, so pay close attention to signage. Common locations to anticipate include:

• Idaho: Eastbound I-90 before entering Montana (Near Lookout Pass).
• Montana: Westbound I-90 after entering from Idaho (Various locations - watch for signs).

Permits: Typically, no specific state-level permits like a KYU or NY HUT are required for a simple Idaho to Montana transit, assuming you are legally registered and operating within federal and state size and weight limits. However, if you exceed standard weight or size limits, you will need to obtain oversized/overweight permits from both the Idaho Transportation Department (ITD) and the Montana Department of Transportation (MDT) prior to your trip. Check ITD and MDT websites for specific requirements based on your load dimensions.

Risks & Hazards

Driving between Idaho and Montana presents unique challenges due to the region's geography and weather patterns.

Seasonal Weather Risks:

• Winter (October - April): Expect significant snowfall, icy road conditions, and reduced visibility, especially in mountainous areas. Lookout Pass on I-90 can experience heavy snow and closures. Carry chains and be prepared to use them. Check road conditions frequently before and during your trip. Extreme cold is common.

• Summer (June - August): Wildfires can pose a risk, potentially leading to road closures and reduced visibility due to smoke. Be aware of fire danger levels and potential detours. Extreme heat can also be a factor, requiring diligent vehicle maintenance and driver hydration practices. Mountain passes can experience sudden afternoon thunderstorms.

Other Hazards:

• Wildlife: Deer and elk are common in this region and can pose a significant hazard, especially at dawn and dusk. Be vigilant and reduce your speed when necessary.

• Mountain Driving: Be aware of steep grades, sharp curves, and limited visibility on certain sections of I-90. Use lower gears when descending steep grades to maintain control.