Idaho rest areas allow 10 hours on the interstate and 16 hours off it

Idaho gives you 10 consecutive hours at a rest area on an interstate and 16 at a rest area on any other state highway route. Both numbers are in the administrative code, not a sign or a guess: IDAPA 39.03.50, section 300.03, checked August 12, 2026, reads “Occupancy of the rest areas on interstate highways is limited to ten (10) consecutive hours. Occupancy of rest areas on other routes of the State Highway System is limited to sixteen (16) consecutive hours.”

The 16-hour figure is the one that gets left out. The interstate number travels further because it is the one people quote, and it is the tighter of the two. If you are stopping on a US route or a state highway rather than an interstate, the rule gives you six more hours than the number you probably have in your head.

The Idaho Transportation Department publishes the same split in plainer words on its rest areas FAQ: “Travelers may stop and rest from travel at rest areas for up to 10 consecutive hours on interstate rest areas and 16 hours on US and state highway rest areas.” The rule sits under Idaho Code 40-312, and the current sections are dated 7-1-24, meaning July 1, 2024.

What the same rule prohibits

Section 300 lists what is not allowed inside a developed rest area, and the time limits are one item on that list. Camping is another. So are fires. Section 400 adds that you may not drive or park “except in places developed for such purpose,” which reads against the gravel edge when the lot is full.

Generators get their own treatment. Section 200.05 bars noise producing devices, naming “electrical generator plants and equipment driven by motors or engines,” when used “in such a manner and at such times so as to disturb other persons.” That is a judgment call, not a decibel limit. ITD’s FAQ is blunter about the power question: “No camping, plugging vehicles, generators, or other camping devices into any outlets at rest areas; or hooking up hoses to water faucets.”

The part the rule does not answer

Nothing in IDAPA 39.03.50 defines camping. It prohibits it and moves on.

That leaves the question everyone actually has. Sleeping in your vehicle inside the time limit is not named as a prohibited act. Putting the awning out, setting up chairs, running a hose to the faucet and cooking on a table is camping by any reading. Between those two is unwritten ground, and the person who decides where the line falls is whoever knocks on your window. The posted sign at that rest area and ITD’s current guidance beat this page.

One more thing before you plan around a specific stop. The westbound Huetter rest area on I-90 between Post Falls and Coeur d’Alene has been closed to passenger vehicles since September 19, 2025, and ITD’s announcement says the closure runs through 2029 for the I-90 expansion project. That release, the most recent ITD statement on it we could find, also said truck parking would stay open until summer 2026 and then the entire facility would close. The eastbound side is unaffected, with no closure anticipated there until 2027. ITD points travelers to Idaho 511 for current rest area and road closures, and that is the page to check the morning you drive.

For the rest of our Idaho data, see the Idaho rest area page and sleeping in your car in Idaho.