Idaho oversize load permits
Idaho allows 14'0" unpermitted, which 20 states do. The other 26 cap at 13'6" — so a 14-foot load legal here needs a permit the moment it crosses into most of them.
Idaho permit requirements
The same seven sections for every state, so two states can be compared without re-learning the layout.
Permit required above
Exceed any one of these in Idaho and the load needs a permit. No overall cap on a tractor-semitrailer on the designated network — the 53' semitrailer is the trigger, and the allowance covers one mile of access off the network plus routes the board has approved. Off the designated network the combination caps at 75' overall and the semitrailer at 48'. Permigo files it for a flat $20, with the state's own fee billed at cost.
Front and rear overhang are capped separately, not combined. Exceed either and Idaho requires a permit.
Filed from Houston, TX. A permit agent answers +1 (786) 494-6912, 7am–7pm CT, 7 days; no card needed for a quote.
Axle limits
Escorts by road type
Police escort at the state’s discretion.
Superload above
No separate superload class published — the permit thresholds above govern.
Movement windows
| Load | Window |
|---|---|
| Black & Interstate routes — within 12'W × 15'H × 120'L | 24/7, 7 days (night extremity lighting) |
| Larger loads (black/interstate) | daylight only; stop 4 p.m. the day before a holiday; >12' wide: no movement on the 6 holidays |
| Red routes | daylight only; travel stops friday 2 p.m.; no weekends, no holidays; resume sunrise Monday |
| Commuter curfews (>13' wide) | 6–9 a.m./4–6:30 p.m. M–F: Boise I-84, CdA I-90, Idaho Falls I-15, Pocatello, Twin Falls corridors |
| 6 holidays | New Year's, Memorial, Independence, Labor, Thanksgiving, Christmas |
| Weather auto-invalidation | wind >40 mph, visibility <500', ice/traction loss, or a '511-Difficult' marking voids the permit en route |
Travel restrictions
Other published tables
ITD pilot/escort map — the official grid
| Route class | Width — 1 pilot | Width — front + rear | Length — pilot | Weekends / holidays |
|---|---|---|---|---|
| Red | >8'6" (front) | >10' | >75' (front) | Banned · Fri 2 p.m. stop |
| Black (general) | >12' (front) | >14' | >120' (front) | OK · 24/7 ≤12'W×120'L×15'H |
| White (Interstate) | >15' (rear) | (to 18') | (none) | OK · 24/7 ≤12'W×120'L×15'H |
Primary source: ITD — commercial vehicle services ↗
Every figure on this page was checked against it on August 4, 2026.
Get Idaho priced and filed
Send the route and a permit agent calls you back with Idaho’s fee, any other state on the way, and one total. Filed from Houston, TX; we answer +1 (786) 494-6912, 7am–7pm CT, 7 days.
Already know the load? Start an order in FleetLynk, the filing app behind Permigo — or send the form and we set it up for you.
States that border Idaho
Limits change at the line. One order covers every state on your route.
Idaho oversize permits, answered
Do I need an oversize permit in Idaho?
You need a permit in Idaho once the load exceeds any one of these: 8'6" wide, 14'0" high, or 80,000 lb gross. On the designated network there is no overall length cap — the 53' semitrailer is the trigger. Off it the combination caps at 75' and the semitrailer at 48'. Axle limits apply too — 20,000 lb on a single axle and 34,000 lb on a tandem.
When does Idaho require an escort?
Idaho requires no escort below 15' wide. Above that the requirement depends on the road type as well as the dimension, which is why the same load can need a front escort on a two-lane and a rear escort on a multilane.
Can I move an oversize load at night in Idaho?
Daylight only above 12' wide. There is no general weekend blackout. Holiday movement is restricted.
What counts as a superload in Idaho?
A load over 16' wide, over 16'0" high, over 120' long is handled as a superload in Idaho.
How much does an Idaho oversize permit cost?
Permigo charges a flat $20 service fee per state permit. Idaho's own permit fee is billed at cost on the same invoice, itemised, with nothing added. Call +1 (786) 494-6912 and we will price your exact route.
What happens if I move without an Idaho permit?
Moving above Idaho's limits without a permit is a violation, not a paperwork gap. The load can be stopped at a scale or by a trooper and held until a permit is issued, the fine is set by Idaho and the citing officer, and a pattern of violations follows the carrier's safety record. If you are not sure the load needs one, when you need an oversize permit walks through the triggers.
Which kind of Idaho permit do I need?
Most moves take a single-trip permit: one load, one route, a set number of days. Many states also sell annual or blanket permits for loads that stay within routine dimensions; whether Idaho does, and for which loads, is on the state's own permit page. A superload is permitted separately and reviewed by the state — the thresholds are in the answer above. Permigo files whichever kind the load needs at the same $20 flat fee; what Idaho itself charges is on the cost guide.
Is an Idaho oversize permit the same as an Idaho truck permit?
No. A "truck permit" usually means the paperwork a truck needs to cross Idaho at all — a trip permit, a fuel permit (IFTA) or IRP plates — which the state's motor-carrier office issues. An oversize or overweight permit covers one load that exceeds Idaho's legal size or weight, and that is what Permigo files.
Also useful: when you need a permit, pilot car requirements by state, and the interactive map of all 48 states.
Moving through Idaho?
$20 flat per state permit, the state's fee at cost. A permit agent answers, 7am–7pm CT.