Colorado CDL Written Test — Questions, Cost & Study Tips (2026)

Studying for your Colorado CDL written exam? Here is what applicants typically need to know before visiting Colorado DMV.

How many questions on the Colorado CDL test?

Colorado general knowledge written exams commonly include about 50 multiple-choice questions for the core CDL knowledge test. Endorsements such as air brakes, combination vehicles, hazmat, and passenger are separate written tests if your license class requires them.

PassCDL mirrors this structure: start with general knowledge, then add endorsement practice for the tests you need.

Colorado CDL test cost (approximate)

Written exam fees at Colorado DMV are typically $20–$35 per attempt (varies by office and endorsement). Failing and retesting can cost more than a month of PassCDL Pro — many students prefer unlimited practice before test day.

Colorado study tip

Colorado CDL knowledge tests are taken at driver license offices — bring medical certificate if required for your class.

Free CO CDL practice test

Use our Colorado CDL practice test for scored questions and explanations. PassCDL Pro adds full exam simulations, all endorsements, and unlimited retakes.

See also: How many questions on the CDL test? · CDL general knowledge study guide

Educational practice only — not affiliated with Colorado DMV or any state DMV.