Colorado CDL practice test
Published Updated Licensing sources checked:
How do I prepare for the Colorado CDL knowledge test?
If you are preparing for your first permit, start with general knowledge and the official Colorado instructions below. If your vehicle needs air brakes or combination vehicles, add those federal study sets; for hazardous materials, use the separate hazmat set. Compare the state’s published test rules with its current manual before you test. These practice sets teach federal topics and do not copy the state exam.
This page is study material. It is not the Colorado state exam, and it does not copy state test questions. Check the official Colorado pages below before you test.
| Your situation | Start with… |
|---|---|
| A quick first try | Take a 10-question warm-up |
| Ready for a longer attempt | Take the 50-question general knowledge exam |
| Need state rules or documents | Check the Colorado application steps |
Colorado commercial driver manual (PDF) — link checked . Study its rules alongside our federal-standard bank. Our 50-question exam length is a study setting; use the official counts below for Colorado.
Colorado DMV’s CDL instructions and manual section 1.1.1 checked November 11, 2026 identify knowledge testing for your class, vehicle and endorsements. Neither checked testing section prints question counts or a knowledge-test passing score. Those figures stay unknown here; our federal practice lengths are separate study settings.
Which tests do I need in Colorado?
| Your vehicle or work | Required study and tests |
|---|---|
| All permit applicants | Start with general knowledge. Official requirements. Federal warm-up · Federal exam mode |
| Class A combination vehicle | Add combination vehicles. Official requirements. Federal warm-up · Federal exam mode |
| Vehicle with air brakes | Add air brakes and check restriction rules. Official requirements. Federal warm-up · Federal exam mode |
| Passenger vehicle | Add the passenger endorsement tests. Official requirements. Federal warm-up · Federal exam mode |
| School bus | Study school bus and passenger topics; check state testing requirements. Official requirements. Federal warm-up · Federal exam mode |
| Tank vehicle | Add the tank vehicle knowledge test. Official requirements. Federal warm-up · Federal exam mode |
| Hazardous materials | Add the hazmat knowledge test and check approval and training steps. Official requirements. Federal warm-up · Federal exam mode |
| Doubles or triples | Add the doubles and triples knowledge test; check state vehicle limits. Official requirements. Federal warm-up · Federal exam mode |
Use the current DMV web instructions for booking and permit rules alongside the manual. Check the non-domiciled permit notice before applying; no other state’s question counts or scores are substituted.
Before booking the exam, check Colorado CDL application steps and official fee lines.
| Test | Questions | To pass | Official source |
|---|---|---|---|
| General knowledge | Not printed on the pages checked | Not printed on the pages checked | State sourceState source |
| Combination vehicles, for Class A | Not printed on the pages checked | Not printed on the pages checked | State sourceState source |
| Air brakes, if applicable | Not printed on the pages checked | Not printed on the pages checked | State sourceState source |
| Passenger | Not printed on the pages checked | Not printed on the pages checked | State sourceState source |
| Tank vehicle | Not printed on the pages checked | Not printed on the pages checked | State sourceState source |
| School bus | Not printed on the pages checked | Not printed on the pages checked | State sourceState source |
| Hazardous materials | Not printed on the pages checked | Not printed on the pages checked | State sourceState source |
| Doubles and triples | Not printed on the pages checked | Not printed on the pages checked | State sourceState source |
Colorado language, permit and booking notes — checked 2026-11-11
Book a CDL Written Test appointment at a state driver license office. The CDL instructions link to fees but do not print a knowledge-test dollar amount. Official source — checked .
DMV says the CLP is valid for one year and cannot be renewed. Hold it for 14 calendar days before the skills test. Written results are valid for one CLP issuance; changing class or endorsement after issuance requires all applicable exams again. Official source — checked .
The checked DMV page lists CDL knowledge testing in English and Spanish, with hazardous-materials knowledge testing English only. Official source — checked .
The checked DMV page carries a suspension notice for issuance and renewal of non-domiciled CLPs and CDLs. Confirm current eligibility and documents directly with DMV before booking. Official source — checked .
For unknown figures, check with the Colorado licensing agency. A blank count is not an estimate.
Federal study sets, not the Colorado exam
Use general knowledge, air brakes, combination vehicles, and hazmat to study the federal topics. Finishing one of those sets does not mean you passed the Colorado test.