Colorado CDL practice test

Getting a commercial driver's licence in Colorado starts with the CDL knowledge tests. The content is federal: every state, Colorado included, writes its tests from the FMCSA CDL manual, so the general knowledge test has 50 questions, the endorsement tests have 20 to 30, and the passing score is 80% on each. Colorado Division of Motor Vehicles administers the test; the rules behind it are published by the FMCSA. Try the free Colorado CDL practice questions below, then pick a full test.

50general knowledge questions
80%passing score on every test
8knowledge tests covered
COpick your state once in the app

Free Colorado CDL practice quiz

Five questions from the general knowledge, air brakes and combination vehicles banks, the three tests most Colorado Class A applicants take first. Tap an answer to see if you were right and read the explanation.

0 of 5 right0 of 5 answered

What is the minimum tread depth for tires other than the front (steering) tires?
Which of these tire conditions is a defect you must not drive with?
Rust trails or shiny metal around the wheel lug nuts most likely mean:
Which of these brake conditions is a defect you must not drive with?
Brake shoes and pads are dangerously thin when the lining is less than:

Every CDL test for Colorado drivers

Each page has a free ten-question quiz, the real question count, the 80% pass mark and what the test covers.

How the Colorado CDL knowledge test works

You take the general knowledge test first; it is required for every CDL class. Class A drivers add the combination vehicles test. Almost everyone takes the air brakes test, because skipping it puts an air brake restriction on the licence. Endorsements (hazmat, tanker, doubles/triples, passenger, school bus) each have their own knowledge test. Pass the tests and you hold a commercial learner's permit; the skills test in a truck comes later.

Fees, appointment rules and test centre locations are set by Colorado; the current ones from Colorado DMV are in the next section. What does not change is the content, and that is what PassRig drills.

Colorado CDL fees and rules

In Colorado the CDL is issued by the Colorado Division of Motor Vehicles. The figures below are taken from its own pages and were last checked on 2 November 2026. Fees and rules change, so confirm with the agency before you go.

Study from the state's own book: Colorado Commercial Driver License Manual. PassRig's questions are written from the same FMCSA manual it is based on.

What	CO	Source
Learner's permit fee	$20.00	dmv.colorado.gov
CDL fee	$35.00	dmv.colorado.gov
Retest fee	$11.50 for a written retest	dmv.colorado.gov
Permit valid for	One year, not renewable	dmv.colorado.gov
Minimum age	18; 21 for a hazmat endorsement	dmv.colorado.gov
Appointment	Book a CDL Written Test appointment at a state driver licence office	dmv.colorado.gov
Test languages	English and Spanish; the hazmat test is English only	dmv.colorado.gov
Medical certificate	DOT medical information is submitted directly to FMCSA’s National Registry by the medical provider	dmv.colorado.gov
Entry-level driver training	Must complete ELDT at an approved school	dmv.colorado.gov
Also worth knowing	CLP held 14 calendar days before the skills test, taken at an approved third-party testing facility	dmv.colorado.gov

2 official pages from Colorado DMV were read for this section. Nothing on it is estimated. Colorado DMV's site is not reachable from outside the US, so these were read from archived copies of its pages captured on 2026-02-24.

Colorado CDL test questions

How many questions are on the Colorado CDL test?

The Colorado CDL general knowledge test follows the federal model: 50 questions, 40 correct to pass. Endorsement tests are shorter: air brakes 25, hazmat 30, and combination vehicles, tanker, doubles/triples, passenger and school bus 20 each.

What is the passing score on the Colorado CDL permit test?

80% on every knowledge test, the same pass mark used across the United States.

Where do I take the CDL knowledge test in Colorado?

Colorado Division of Motor Vehicles gives the test. Book a CDL Written Test appointment at a state driver licence office The test content itself comes from the FMCSA CDL manual.

How much does a CDL permit cost in Colorado?

Colorado DMV lists the commercial learner's permit fee as $20.00. Fees change, so check the agency's fee page before you go.

Does PassRig have Colorado CDL practice questions?

Yes. Pick Colorado in the app and you get practice sets and mock exams built from the knowledge test content your state uses, with the real counts and the 80% line.