Checked against official Idaho sources on Oct 8, 2026
Idaho CDL practice test
Every state needs at least 80% on each CDL written test, and Idaho follows the same federal rule. Below are the fees, ages and rules we checked against the official Idaho source, and a free practice test.
FirstTry CDL is not affiliated with any DMV, FMCSA or government agency. Practice questions are exam-style questions built from the official CDL manual, not actual test questions.
Idaho CDL facts
| What | What Idaho says | Source |
|---|---|---|
| Minimum age and experience | You must be at least 18 years old. You must have a valid Idaho Class D license or have passed all tests to get one. You must also have one year of licensed driving experience to get a CDL. | Official page |
| CLP fee and validity | The Commercial Learner's Permit costs $29 and is valid for one year. | Official page |
| CLP holding time | You must hold your CLP for at least 14 days before the skills test, even if you already have a CDL and are upgrading. | Official page |
| Knowledge test fee | $5.00 for each written or endorsement knowledge test. | Official page |
| Knowledge test retest | If you fail a test, you can retest in three days and pay another $5. | Official page |
| Knowledge test results valid for one year | Test results are good for one year from the date you passed. If you do not get your CDL in that year, you must retake all the written tests. | Official page |
| Test order | Pass the General Knowledge test before you try the other tests. Most applicants should not take several tests on the same day. | Official page |
| CDL fees | 4 year CDL (age 21 and over) is $40. 8 year CDL (age 21 and over) is $60. 3 year CDL (age 18 to 21) is $30. 1 year CDL (age 20) is $15. | Official page |
| Seasonal CDL | A seasonal CDL costs $44. It is for certain farm related services, is valid for 180 days in a 12 month period, and can be obtained only twice in a lifetime. You must be at least 16 and have a valid Class D license. | Official page |
| Other fees | License upgrade is $30. Adding an endorsement after you get a CDL is $20. A duplicate license or permit is $20. | Official page |
| Skills test fee | $200 in total. $10 goes to the DMV office and up to $190 goes to the skills test examiner. | Official page |
| Skills test scheduling | You contact a CDL skills test examiner yourself. Examiners must tell ITD at least 48 hours before any CDL test, so book well ahead. The test takes about two hours. | Official page |
| Before the skills test | You must pass all knowledge tests before the skills test. You must also finish Entry Level Driver Training from a registered provider. | Official page |
| Finishing your CDL | After you pass, the examiner sends your results to ITD. You must go back to the county DMV to get your CDL issued. | Official page |
| K restriction | The K restriction means driving in Idaho only. It is put on all 18, 19 and 20 year old CDL holders. | Official page |
| E restriction | Testing in a truck or bus with an automatic transmission puts an E restriction on your CDL, so you can drive only automatic vehicles. | Official page |
| O restriction | If you test in a Class A combination that does not use a fifth wheel hitch, you get an O restriction. You need a skills test with a fifth wheel tractor trailer to remove it. | Official page |
| Air brake restriction | You get an L restriction unless you pass the air brakes knowledge test and a skills test in a vehicle with air brakes. | Official page |
| School bus endorsement | School bus drivers must have both the Passenger (P) and School Bus (S) endorsements. Both need a written test and a skills test. | Official page |
| Hazmat endorsement | You need a written test and a TSA background check to get the H endorsement, and again at each license renewal. | Official page |
| Tank endorsement | The N endorsement is for tanks with an individual rated capacity of more than 119 gallons and a total of 1,000 gallons or more. | Official page |
| Online renewal | CDL holders without a hazmat endorsement may be eligible to renew online. | Official page |
| Expired CDL | If your CDL has been expired for 25 months or more and you want to keep CDL privileges, you must take the Class D knowledge test, all CDL written tests that apply, and a skills test. | Official page |
| New residents | You must apply for an Idaho license, including a CDL, within 30 days of living in Idaho, even if your out of state license has not expired. | Official page |
| Medical certificate | Your medical provider must send your DOT medical results electronically. You cannot turn in the forms yourself. | Official page |
| Medical certificate length | A DOT physical may be valid for up to 24 months. The examiner may issue a certificate for less than 24 months to monitor a medical condition. | Official page |
| Military waivers | Idaho offers a military CDL skills test waiver (ITD 3141) and a knowledge and skills test waiver (ITD 3143) for current or recently separated military with heavy truck experience. | Official page |
Fees and rules change. Confirm on the official Idaho CDL page before you go. Read the official Idaho CDL manual.
CDL test formats
We show the national defaults for question counts and time limits. Check the official Idaho manual for anything that differs.
| Test | Questions | To pass | Typical time |
|---|---|---|---|
| General Knowledge | 50 | 40 (80%) | About 60 minutes |
| Air Brakes | 25 | 20 (80%) | 25 to 30 minutes |
| Combination Vehicles | 20 (25 questions in some states) | 16 (80%) | 20 to 25 minutes |
| Hazardous Materials | 30 | 24 (80%) | 30 to 40 minutes |
| Tanker | 20 | 16 (80%) | 20 to 25 minutes |
| Passenger | 20 | 16 (80%) | 20 to 25 minutes |
| School Bus | 20 (25 questions in some states) | 16 (80%) | About 25 minutes |
| Doubles/Triples | 20 | 16 (80%) | About 20 minutes |
Practice any of them: all CDL practice tests.