Idaho Oversize Load Permit Requirements
Legal truck dimensions, oversize load travel hours, pilot car and escort requirements, and how to order an oversize/overweight permit from Idaho Transportation Department (Commercial Vehicle Services / Permits4Idaho).
ID, reviewed October 2026
Check your load for Idaho
Oversize permit required in Idaho
- Width 10 ft 0 in exceeds the 8 ft 6 in legal limit.
No width-based pilot car at 10 ft 0 in wide.
Idaho Truck Legal Width, Height & Length
A truck and load at or under these dimensions can travel Idaho highways without an oversize permit. Exceed any one of them and you need a permit before you move.
| Legal width | 8 ft 6 in |
|---|---|
| Legal height | 14 ft 0 in |
| Legal length | Single motor vehicle 45 ft; semitrailer 48 ft (53 ft on national network and access routes); truck-tractor with semitrailer and trailer (doubles) 75 ft overall, 61 ft trailers combination (68 ft on national network); 115 ft on designated LCV routes by permit (Idaho Code 49-1010). |
| Gross weight | 80,000 lbs |
Idaho Oversize Load Travel Hours
- Daily movement window
- Loads not over 12 ft wide, 120 ft long and 15 ft high may travel 24 hours, 7 days (black-coded routes and interstate). Larger loads are daylight-only per the ITD pilot/escort map. Loads over 13 ft wide barred 6-9 am and 4-6:30 pm Mon-Fri at listed commuter areas (Boise valley I-84, Coeur d'Alene, Idaho Falls, Twin Falls, etc.).
- Weekend movement
- Red-coded routes: daylight only until 2 pm Friday, no Saturday or Sunday travel, resumes Monday at sunrise. Black-coded and interstate: loads within 12 ft wide / 120 ft long / 15 ft high may travel weekends; larger loads follow the pilot map restrictions.
- Holiday restrictions
- IDAPA 39.03.01 sec 305: black-coded routes and interstate loads over the 12 ft / 120 ft / 15 ft thresholds may not travel after 4:00 pm on the day preceding a holiday and may resume at sunrise the day after. Red-coded routes stop at 2 pm the day before and resume at sunrise the day after the holiday. See this year's holiday dates for all states.
Idaho Pilot Car Requirements
On black/white-coded routes and interstates, escort is shown on ITD's pilot map as one front at 12'1" to 14' wide and front plus rear at 14'1" to 18'; length over 120 ft needs a front escort; height pole front escort above 16 ft.
| First pilot car (width) | 12 ft 1 in wide and over |
|---|---|
| Two pilot cars (width) | 14 ft 1 in wide and over |
| Height-pole escort | 16 ft 0 in tall and over |
| Length escort | 120 ft 0 in long and over |
Idaho pilot car requirements by load width and height. Crossing a border? Compare with Montana, Washington.
How to order a Idaho oversize permit
Idaho Transportation Department (Commercial Vehicle Services / Permits4Idaho)
Overweight as well? Check axle limits with the bridge formula calculator.
Crossing Idaho without Idaho apportioned plates? Estimate the temporary trip permit cost with the trip permit cost estimator.
Idaho Oversize Load FAQs
- What are the oversize load travel hours in Idaho?
- Loads not over 12 ft wide, 120 ft long and 15 ft high may travel 24 hours, 7 days (black-coded routes and interstate). Larger loads are daylight-only per the ITD pilot/escort map. Loads over 13 ft wide barred 6-9 am and 4-6:30 pm Mon-Fri at listed commuter areas (Boise valley I-84, Coeur d'Alene, Idaho Falls, Twin Falls, etc.). Weekends: Red-coded routes: daylight only until 2 pm Friday, no Saturday or Sunday travel, resumes Monday at sunrise. Black-coded and interstate: loads within 12 ft wide / 120 ft long / 15 ft high may travel weekends; larger loads follow the pilot map restrictions.
- When is a pilot car required in Idaho?
- On black/white-coded routes and interstates, escort is shown on ITD's pilot map as one front at 12'1" to 14' wide and front plus rear at 14'1" to 18'; length over 120 ft needs a front escort; height pole front escort above 16 ft. Height: 16 ft 0 in and taller (height-pole escort).
- What is the legal truck width in Idaho?
- The standard legal width in Idaho is 8 ft 6 in (102 inches), the federal minimum width allowed on the National Network of highways. A load wider than that needs an oversize permit.
- How tall can a truck be in Idaho without a permit?
- The legal height limit in Idaho is 14 ft 0 in, measured from the road surface to the highest point of the vehicle or load. Taller loads need an oversize permit and a surveyed route for bridge and wire clearances.
- Can oversize loads move on holidays in Idaho?
- IDAPA 39.03.01 sec 305: black-coded routes and interstate loads over the 12 ft / 120 ft / 15 ft thresholds may not travel after 4:00 pm on the day preceding a holiday and may resume at sunrise the day after. Red-coded routes stop at 2 pm the day before and resume at sunrise the day after the holiday.
- How do I get an oversize or overweight permit in Idaho?
- Apply through Idaho Transportation Department (Commercial Vehicle Services / Permits4Idaho) or its online permit portal. Have your USDOT number, vehicle and load dimensions, axle weights and route ready. Permit expediting agents can file on your behalf if you need the permit the same day.
Regulations change. This page summarises published Idaho rules as reviewed October 2026 and is not legal advice; the conditions printed on your permit control. Note: Escort thresholds come from a garbled table in ITD's pilot/escort map (Jan 8 2025 version) and vary by route color (red vs black/white); the 12'1"/14'1" thresholds are for the black/interstate-type row and are my best reading of the table. Red routes have lower thresholds (front escort from about 10 ft wide, front+rear above 10'1"). Height pole is required for loads over 16 ft per IDAPA 39.03.01 sec 306. Legal gross 80,000 on interstate; other Idaho routes allow up to 105,500 lbs under 49-1001. Permit-office phone not found on an official page (ITD main (208) 334-8000; CVS registration (208) 872-3163).