Idaho HazMat CDL Practice Test
Practice for your HazMat CDL exam with questions based on the official Idaho CDL handbook
Updated: August 2026
What's on the Idaho HazMat CDL test
Answering from memory beats re-reading — retrieval practice roughly doubles what you remember a week later. These free questions are modeled on the official HazMat CDL knowledge test.
- Questions
- 30
- To pass
- 24/30 correct (80%)
- Updated
- June 2026
- 100% free
The Idaho CDL HazMat test follows the AAMVA standard used by most states: 30 questions, with 24 correct answers (80%) needed to pass. A CDL learner's permit in Idaho costs $29 (Idaho Transportation Department (ITD) – Division of Motor Vehicles fee schedule, June 2026).
Start the practice testAll Idaho CDL tests
The Idaho HazMat test is one section of the Idaho CDL knowledge exam. For the full set — general knowledge questions, every endorsement section, and Idaho’s permit requirements in one place — go to the Idaho CDL permit practice test.
Other Idaho CDL Practice Tests
HazMat Practice Tests in Nearby States
More free CDL practice tests
About the HazMat Test in Idaho
The HazMat endorsement test is required in Idaho for drivers who transport hazardous materials. It covers placarding, labeling, loading procedures, emergency response, and compliance with federal hazmat regulations. A TSA background check is also required.
The HazMat test is part of the CDL written exam administered by the Idaho Department of Motor Vehicles. You must pass this test along with the other required written tests to receive your Commercial Learner's Permit (CLP) in Idaho.
Our practice questions are built from the official Idaho CDL handbook and federal FMCSA regulations. Each question includes a detailed explanation to help you understand the material, not just memorize answers.
Idaho HazMat endorsement facts
| Fact | Value | Source |
|---|---|---|
| Licensing agency | Idaho Transportation Department (ITD), Division of Motor VehiclesDriver-licensing offices are operated by county Sheriff’s or Assessor’s offices | itd.idaho.gov |
| CDL fee — 4-year term | $40The standard term for applicants 21 and over | itd.idaho.gov |
| Commercial Learner’s Permit fee | $29 | itd.idaho.gov |
| Written knowledge test fee | $5Charged per test, and again on every retake | itd.idaho.gov |
| Fee to add an endorsement after the CDL is issued | $15Does not include the written-test fee | itd.idaho.gov |
| CDL validity | 4 years1- or 2-year terms are issued at age 20 or with the K / intrastate restriction | itd.idaho.gov |
| K restriction — intrastate only | Applied to every 18, 19 and 20 year old CDL holder, and to Idaho-only drivers | itd.idaho.gov |
| CLP validity | 1 year | itd.idaho.gov |
| CLP hold before the skills test | 14 daysITD cites the federal minimum; the same wait applies when upgrading an existing CDL | itd.idaho.gov |
| Wait before retaking a failed written test | 3 daysYou pay the $5.00 written-test fee again | itd.idaho.gov |
| How long passed knowledge tests stay valid | 1 year from the date passedMiss that window and every written test must be retaken | itd.idaho.gov |
| Which knowledge test everyone takes | The General Knowledge test, required of all new CDL applicants | itd.idaho.gov |
| Where you apply and test | County Sheriff’s or Assessor’s driver-licensing offices, not ITD offices | itd.idaho.gov |
| Entry-Level Driver Training | Required from a provider on FMCSA’s Training Provider Registryeffective February 7, 2022 | itd.idaho.gov |
| DOT medical certificate validity | Up to 24 monthsShorter when the examiner wants to monitor a condition | itd.idaho.gov |
| Who can perform the medical exam | A provider listed on the National Registry of Certified Medical Examiners | itd.idaho.gov |
| How the medical certificate reaches the state | The provider submits results directly to FMCSA — drivers cannot hand in the formseffective June 23, 2025 | itd.idaho.gov |
| Online renewal | Available to some CDL holders — but not if you hold a hazmat endorsement | itd.idaho.gov |
| Class C definition | Under 26,001 lbs but designed for 16+ people including the driver, or placarded for hazardous materials | itd.idaho.gov |
| What the hazmat endorsement requires | A written test plus TSA threat-assessment clearance — to obtain it and again at each licence renewal | itd.idaho.gov |
| X endorsement | Combines tank (N) and hazmat (H); a licence may show either X, or N and H separately | itd.idaho.gov |
| TSA security threat assessment fee (federal) | $85.25Non-refundable; paid to TSA, not the stateeffective January 1, 2025 | tsa.gov |
| TSA reduced fee (valid TWIC holders, where the state accepts it) | $41 | tsa.gov |
| TSA clearance validity | 5 years | tsa.gov |
| When to enroll with TSA | At least 60 days before you need the endorsementTSA says some applications take more than 45 days | tsa.gov |
How to add the HazMat endorsement in Idaho
- Complete Entry-Level Driver Training for the hazmat endorsement before the knowledge test — ELDT has applied to CDL applicants since February 7, 2022. Source
- Pass the hazardous-materials written knowledge test at a county driver-licensing office — $5.00 per written test. Source
- Clear the Transportation Security Administration threat assessment — Idaho requires it both to obtain the hazmat endorsement and again at every driver-licence renewal. Source
- Enrol with TSA and get fingerprinted well ahead of time — TSA advises starting at least 60 days out, and Idaho cannot add the endorsement until the assessment clears. Source
- Pay $15 to add the endorsement if your CDL has already been issued — that fee does not include the written-test fee. Note that a CDL carrying hazmat cannot be renewed online. Source
Official Idaho Transportation Department, Division of Motor Vehicles links
As of September 2, 2026, verified against Idaho Transportation Department, Division of Motor Vehicles.
Idaho CDL questions
- How long is an Idaho CLP valid, and when can I take the skills test?
- The permit costs $29 and is valid for one year. You must hold it at least 14 days before taking a skills test — and that 14-day wait applies even if you already hold a CDL and are only upgrading it. Source
- What happens if I fail an Idaho CDL written test?
- You can re-test after three days, and you pay the $5 test fee again. Tests you have already passed stay valid for one year from the date you passed them — if you do not get your CDL within that year, every written test must be retaken. Source
- What does the hazmat endorsement involve in Idaho?
- You pass a written test and clear a TSA security threat assessment — and Idaho requires that clearance again at every driver-licence renewal, which is also why a CDL carrying hazmat cannot be renewed online. Adding the endorsement after your CDL has been issued costs $15 on top of the $5 written test. Source
- How old do I have to be for an Idaho CDL?
- At least 18, with one year of licensed driving experience and either an Idaho Class D licence or passing scores on the tests for one. Every 18, 19 and 20 year old CDL holder carries the K restriction, which limits them to driving commercially inside Idaho. Source
- What does Idaho require for the DOT medical certificate?
- Most commercial driving needs one. The exam must be done by a provider on the National Registry of Certified Medical Examiners and can be valid for up to 24 months; since June 23, 2025 the provider files the results with FMCSA electronically — you cannot turn the forms in yourself. ITD estimates the exam costs $60–150 from a private provider. Source
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