State guide · Updated October 2026
Idaho Driving Laws (2026): A Complete Guide
Idaho belongs to the West region, with Boise as the capital and Boise and Meridian as its biggest cities. This guide collects the Idaho driving laws that matter most, covering speed limits and phone use to coverage, taxes, inspections and riding.
Every topic below covers one law in detail, with the facts, the numbers and how it compares nationally with sources; data was reviewed October 25, 2026.
Idaho driving laws: speed limits
The top speed limit in Idaho is 80 mph. Interstates carry limits of up to 75 mph in town and country alike.
| Idaho: Maximum posted speed | 80 mph |
|---|---|
| Rural interstates | 75 mph |
| Urban interstates | 75 mph |
80 mph is posted on designated rural interstate segments.
On busy roads such as I-84 and I-15, signs are frequently lower than 80 mph, especially through Boise and in work zones.
Every driver must also hold a speed that suits rain, fog and traffic, even under the limit, and officers can write a ticket for that alone.
At a glance, under Idaho driving laws: max speed limit, 80 mph.
Idaho driving laws: cell phone and texting law
Only hands-free. Idaho enforces a hands-free law: motorists cannot hold a phone to talk, text or browse on the road. Hands-free calls and navigation are allowed.
| Idaho: Holding a phone while driving | Banned |
|---|---|
| Texting while driving (all motorists) | Banned |
| Phone ban for new motorists | No |
Under the Idaho driving laws, a phone in a mount, a voice assistant and one swipe to answer a call or begin a route stay legal; holding the phone at a stoplight is what gets ticketed.
In short, under Idaho driving laws: phone law, hands-free law.
Idaho driving laws: driving age and teen licenses
In Idaho, teenagers can obtain a learner's permit at 14 and an intermediate (provisional) license at 15, with night and passenger limits after that.
| Idaho: Permit age | Age 14 |
|---|---|
| Provisional license | Age 15 |
| Hours with an adult | 50 (10 at night) |
| Unrestricted license | After 6 months licensed or at 17, whichever comes first |
To qualify for the road test, new drivers in Idaho need 50 hours (10 at night) of supervised driving.
Bottom line, under Idaho driving laws: learner's permit age, permit at 14.
Idaho driving laws: minimum car insurance
Idaho requires drivers to carry at least 25/50/15 in liability coverage: $25,000 for injuries to one person, $50,000 for all injuries in one accident and $15,000 for property damage.
| Idaho: Injury limit per person | $25,000 |
|---|---|
| Injury limit per crash | $50,000 |
| Property damage limit | $15,000 |
| Extra required coverage | None |
| At-fault or no-fault | At-fault |
| Must you insure | Yes |
Idaho is an at-fault state, so the at-fault driver is responsible for the other drivers' injuries and damage through their policy.
Bare-minimum coverage rarely covers a serious crash, since treatment and repairs can top $50,000 in one crash.
Consumer groups suggest a floor of 100/300/100, as damages above your limits may be claimed from you personally.
In short, under Idaho driving laws: car insurance, 25/50/15.
Idaho driving laws: car sales tax
Idaho collects a 6% state sales tax on cars you buy, and local taxes may add to that.
| Idaho: Statewide rate | 6% (sales tax) |
|---|---|
| Local add-ons | Yes, in some areas |
| Trade-in deducted | Yes |
| State tax on a $30,000 car | $1,800 |
A few resort cities add a small local option tax.
- A $19,200 car in Idaho: roughly $1,152 in state tax
- A $33,800 car in Idaho: about $2,028 in state tax
- A $55,000 car in Idaho: roughly $3,300 in state tax
A trade-in cuts the Idaho driving laws: a $30,000 car with a $5,000 trade-in owes roughly $1,500 compared with $1,800.
At a glance, under Idaho driving laws: car sales tax, 6%.
Idaho driving laws: vehicle inspection and emissions
No. Idaho does not require regular safety inspections or emissions tests for passenger vehicles.
| Idaho: Safety check | Not mandatory |
|---|---|
| Emissions testing | Not mandatory |
The Treasure Valley (Ada and Canyon County) emissions program ended in 2023.
Without periodic inspections in Idaho, maintaining brakes and tires in good order is up to the owner.
At a glance, under Idaho driving laws: car inspection, no regular inspection.
Idaho driving laws: license and registration deadlines for newcomers
After moving to Idaho, you have 30 days to obtain a Idaho driver's license, and 30 days to register your car.
| Idaho: License deadline | 30 days |
|---|---|
| Register your car | 30 days |
| Required insurance | 25/50/15 |
| Inspection law | No regular inspection |
The Idaho Transportation Department gives 30 days for both, even if your out-of-state license and registration are still valid.
Step-by-step list for Idaho driving laws
- Get a Idaho driver's license: 30 days. Bring proof of identity, your Social Security number and two proofs of address to the Idaho Transportation Department (ITD) (REAL ID rules).
- Set up car insurance at or above the minimum: Idaho sets a floor of 25/50/15. Coverage is generally mandatory ahead of registration.
- Vehicle check: No periodic inspection, though a VIN check can be needed for an out-of-state car.
- Register and title your car: 30 days at the county assessor's office.
The clock generally begins once you take a job, rent a home or put children in a local school in Idaho, not on the day the boxes arrive.
In short, under Idaho driving laws: new resident deadline, 30 days.
Idaho driving laws: motorcycle helmet law
Only for motorcyclists under 18. In Idaho, motorcyclists 17 and younger must wear a helmet; riders 18 and older may choose to ride without one. Local ordinances in Boise or Boise cannot relax it; it applies statewide.
| Idaho: Helmets mandatory for | Riders 17 and younger |
|---|---|
| Kind of law | Partial (age-based) |
| Adult motorcyclists exempt | Yes |
Riders 17 and younger must wear a helmet under the Idaho driving laws; at 18 it becomes optional.
NHTSA estimates that helmets reduce over a third of rider deaths in serious crashes, and about 41% of passenger deaths.
A legal helmet carries the DOT symbol on the back; thin novelty shells that lack it are not legal.
In short, under Idaho driving laws: helmet law, under 18.
Idaho driving laws: lane splitting
No. Riding between lanes are illegal in Idaho. Each motorcycle gets its own full lane, and riders cannot squeeze between cars or split traffic.
| Idaho: Lane splitting (moving traffic) | Not legal |
|---|---|
| Lane filtering (stopped traffic) | Not legal |
| Legal since | — |
With no law allowing it, Idaho driving laws is treated as unlawful passing, and a crash while doing it can undercut the rider.
At a glance, under Idaho driving laws: lane splitting, not allowed.
Where the Idaho driving laws stand out
- 80 mph (max speed limit), in the faster group of 9 nationwide
- Permit at 14 (learner's permit age) — in the earlier group of 9 nationwide
Getting around Idaho
The main routes are I-84, I-15 and I-90, which tie together Boise, Meridian and Boise, the capital. Every one of these roads is covered by Idaho driving laws.
You get a license from the Idaho Transportation Department (ITD), and plates and titles come from the county assessor's office.
All of the Idaho driving laws above apply in each county, whether in Boise or in rural counties.
Across the border
- Montana: None for car sales tax, against 6%; 25/50/20 for car insurance, against 25/50/15
- Nevada: 6.85% for car sales tax, against 6%; 25/50/20 for car insurance, against 25/50/15; helmet law of All riders instead of Under 18
- Oregon: max speed limit 70 mph (vs. 80 mph); 0.5% for car sales tax, against 6%; 25/50/20 for car insurance, against 25/50/15
- Utah: 4.85% for car sales tax, against 6%; car insurance 30/65/25 (vs. 25/50/15); helmet law Under 21 (vs. Under 18)
- Washington: max speed limit 70 mph (vs. 80 mph); car sales tax 6.8% (vs. 6%); car insurance 25/50/10 (vs. 25/50/15)
- Wyoming: car sales tax of 4% instead of 6%; car insurance of 25/50/20 instead of 25/50/15
Questions about the Idaho driving laws
Do the Idaho driving laws differ for trucks?
Most roads in Idaho post the same limit for passenger cars and big rigs; look out for truck-only limits.
Can an officer stop you just for breaking the Idaho driving laws?
Yes. In Idaho it is usually primary enforcement, so an officer may stop you for it even with no other violation.
Can a 15-year-old drive alone under the Idaho driving laws laws?
Yes, once they hold an intermediate license and its restrictions.
Can I drive without Idaho driving laws?
Skipping insurance in Idaho can bring penalties, loss of your registration, and personal liability for the damage you cause.
Is the Idaho driving laws charged on used vehicles?
Yes. Used vehicles are taxed too, and private sales can be valued at a minimum or a book value.
Is a Idaho driving laws needed to sell a car?
Usually not in Idaho, but a pre-purchase check is smart.
Must adult motorcyclists follow the Idaho driving laws?
No. Only riders 17 and younger are covered in Idaho.
Is moving up at a light part of Idaho driving laws?
No. Riding between stopped vehicles at a light is banned in Idaho too.