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Idaho at a glance
Unclear- Status
- Unclear: titled, plates vary
- Where you can drive
- Varies; OHV plate covers non-state, non-interstate roads
- Speed rule
- No Kei rule; OHV state-highway use tied to posted limits
- Interstates
- Not on the OHV route; otherwise unclear
- Title / registration
- County assessor; gray-market title brand
- Inspection
- Investigator statement of facts or VIN inspection
- Emissions
- No Kei-specific rule; ask your county
- Key law
- Idaho Code §49-402(10); IDAPA 39.02.05.401
Are Kei Trucks street legal in Idaho?
Idaho is a split decision, so we list it as unclear. Three official sources point in different directions:
- The statute. Idaho Code §49-402(10) forbids registering, or driving on public highways, any vehicle that falls short of Federal Motor Vehicle Safety Standards (FMVSS), unless something else specifically authorizes it. Section 49-107(5) ties FMVSS to the manufacturer's certification, which no Japanese-market Kei Truck carries.
- The titling rule. IDAPA 39.02.05.401, the Idaho Transportation Department (ITD) rule for gray-market vehicles, lists the documents for title and registration of a vehicle built for another market. It also lets the county assessor issue a conditional registration while federal releases are pending.
- The titling policy. Since October 1, 2021, ITD has titled a gray-market vehicle that was at least 25 years old when imported, with a title brand stating that it is exempt from FMVSS compliance.
Published accounts conflict: some owners and guides describe ordinary Idaho plates, while others read §49-402(10) as a bar. Your county assessor's motor vehicle office makes the first call, so get its answer in writing before you buy.
Where can you drive a Kei Truck in Idaho?
With ordinary plates, Idaho has no Kei-specific road, speed or interstate rule. If the county will not issue ordinary plates, the fallback is an off-highway vehicle (OHV) restricted plate plus an OHV certificate of number (§49-402(4)). Under Idaho Code §49-426 that combination allows:
- any highway that is neither a state highway nor an interstate
- state highways without full access control, within city limits and for one mile past them, where the posted limit is 60 mph or less
- up to five continuous miles of such a state highway posted 65 mph or less, to connect trails or reach fuel, food, lodging or repairs
- crossings at intersections after a full stop, except on interstates and fully access-controlled highways
Those 60 and 65 mph figures are road limits: they decide which stretches of state highway you may use.
The catch is eligibility. The OHV route works only if the truck counts as a utility type vehicle (UTV) under §67-7101: a recreational motor vehicle at least 50 and less than 80 inches wide, weighing at least 900 lb, and not registered under Title 49. A Kei Truck meets the numbers, but it was built as a work truck. Ask before you rely on it. Our Kei Truck vs UTV comparison explains how the two machines differ.
Farm and snow-removal use
Under §49-426(2), an OHV used only for farming, ranching, dairy or livestock work, or only for snow removal, needs no OHV plate or number. Its highway travel is limited to trips between farm or ranch locations.
How do you get a Kei Truck titled and plated in Idaho?
Titling and registration both start at your county assessor's motor vehicle office.
Ask your county assessor first
Ask in writing whether the motor vehicle office will title and register a 25-year-old Japanese Kei Truck for road use, and what it does when Idaho Code §49-402(10) comes up. Keep the reply.
Collect the ownership papers
Bring the Japanese export certificate or registration with a certified English translation, bills of sale showing the chain of ownership, and US Customs and Border Protection (CBP) Form 7501, stamped by Customs.
Add the federal import forms
Bring the HS-7 import declaration with box 1 (the 25-year exemption) checked and EPA Form 3520-1, the Environmental Protection Agency's import declaration. ITD treats the HS-7 as optional when the truck was 25 or more years old at import, but carrying it avoids delays.
Complete the inspection and affidavit
IDAPA 39.02.05.401 calls for a statement of facts from a motor vehicle investigator, or a VIN inspection if that is waived, plus a statement indemnifying the department.
Register, or ask about the OHV plate
If ordinary plates are issued, insure and register as usual. If not, ask whether the truck qualifies for a restricted OHV plate and certificate of number, and learn that route's road limits first.
If you do get ordinary plates, mount them securely. Japanese plate brackets are drilled for Japanese plates, and our Kei Truck plate adapters solve that. Keep the Kei Truck lights working too, since both routes put you on public roads.
What changed recently in Idaho?
The Legislature amended §49-402 during the 2026 session, but subsection (10) is still in the current text. We found no Idaho bill aimed at Kei Trucks as of October 2026. Before you buy, read about the 25-year rule and the importing process, and see how neighboring states compare on the Kei Truck law map.
Frequently asked questions
Are Idaho interstates open to a Kei Truck?
Not on the off-highway vehicle route, which excludes interstates and fully access-controlled highways. Idaho has no Kei-specific interstate ban for a truck with ordinary plates, but ordinary plates are the uncertain part in Idaho. A 660 cc truck is also badly matched to interstate traffic speeds, so plan routes on slower roads either way.
Will Idaho title an imported Kei Truck?
Yes. Under the Idaho Transportation Department's imported vehicle policy, in force since October 1, 2021, a gray-market vehicle that was at least 25 years old at import is titled with a brand stating it is exempt from FMVSS compliance. You need the foreign ownership document, bills of sale, the customs entry and an investigator's statement or VIN inspection.
What does Idaho Code §49-402(10) mean for a Kei Truck?
It forbids registering or driving on public highways any vehicle that falls short of federal motor vehicle safety standards, unless something else specifically authorizes it. Idaho measures those standards by the maker's certification, which a Japanese-market Kei Truck lacks. How each county squares that with ITD's gray-market titling rules is the open question.
Is a Kei Truck allowed on an Idaho farm without plates?
On private land, yes. On public roads, Idaho Code §49-426(2) exempts off-highway vehicles used only for agriculture, livestock or snow removal from OHV plates and numbers, with road travel limited to trips between farm or ranch locations. That exemption helps only if your truck counts as an off-highway vehicle, which is not settled.
Does a Kei Truck count as a UTV in Idaho?
It meets the size and weight figures in Idaho Code §67-7101: at least 50 and less than 80 inches wide, and at least 900 lb. The definition also calls a UTV a recreational motor vehicle, and a Kei Truck was built for work. No published Idaho guidance settles that, so ask in writing before you depend on the OHV route.
Is there a bill to change Idaho's Kei Truck rules?
We found none as of October 2026. Lawmakers amended the registration statute, §49-402, during the 2026 session, but the federal safety standards bar in subsection (10) is still in the current text. A change would most likely come as an amendment to that subsection or a new vehicle class.
Sources
- Idaho Code §49-402, Annual registration (subsection 10)
- Idaho Code §49-107, Definitions (FMVSS)
- Idaho Code §49-426, Off-highway vehicle operation on highways
- Idaho Code §67-7101, Definitions (utility type vehicle)
- IDAPA 39.02.05, Issuance of Certificates of Title (Section 401, gray market vehicles)
- Idaho Transportation Department, Imported Vehicle Titling Policy (2021)
This page explains the rules in plain English. It is not legal advice. Laws change and offices apply them differently, so confirm with your state DMV or county titling office before you buy or register a truck.