Idaho oversize permit office
Idaho Transportation Department, DMV Commercial Vehicle Services - Special Permits. Call (208) 872-3163, 8:00 A.M. to 5:00 P.M. Mountain Time, Monday to Friday Mountain time.
From Idaho's own pages, checked 2026-10-24. Fees and rules change: the state's page is the last word.
- Apply online
- Permits4IdahoSource
- How to get one
- Apply online at Permits4Idaho, call the permit office, or get one in person at a Port of Entry.
- cvs@itd.idaho.gov
- Single trip fee
- $30 for oversize only, single trip; $33 for overweight/oversize or overweight (non-divisible) single trip; overweight non-reducible loads also pay a road use fee per mile (Section 49-1004(2), Idaho Code).Source
- Legal without a permit
- Width 8 1/2 feet · Height 14 feet · Length 53 feet semitrailer on the national network; 75 feet for a motor vehicle and one or more trailers · Weight 80,000 pounds gross on interstate highways; 105,500 pounds gross otherwiseSource
- Superloads
- Loads over 16 feet wide (18 feet on the interstate), over 16 feet high, or over 120 feet long (150 feet on the interstate) need extra ITD approval.Source
- How fast
- Big loads that need extra ITD approval can take up to 24 working hours.Source
When you can move
- Daylight
- On red-coded routes oversize loads move in daylight only. On black-coded routes and interstates, loads over 12 ft wide, 120 ft long or 15 ft high move in daylight only.Source
- At night
- On black-coded routes and interstates, loads up to 12 ft wide, 120 ft long and 15 ft high may run 24 hours a day, 7 days a week. Red-coded routes: no night travel.
- Weekends
- Red-coded routes: travel stops at 2 p.m. Friday and resumes at sunrise Monday. Black- and white-coded routes: weekend travel allowed.
- Holidays
- New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, Christmas. Black-coded routes and interstates (loads over 12 ft wide, 120 ft long or 15 ft high): no travel after 4 p.m. the day before the holiday until sunrise the day after. Red-coded routes: travel stops at 2 p.m. the day before and resumes at sunrise the day after. Next datesSource
- Rush-hour curfews
- 10 in Idaho, such as Boise valley, I-84 MP 26 to MP 59 (loads over 13 ft wide): Mon-Fri 6-9 a.m. and 4-6:30 p.m. All of them