What Colorado requires for a CDL and how the process works

Colorado issues a Commercial Driver's License (CDL) through the Department of Revenue's Division of Motor Vehicles. To get one, you must pass a written knowledge test, a skills test behind the wheel, and a medical examination. You also need to be at least 18 years old (21 if you plan to drive interstate) and hold a valid Colorado driver's license before you start.

The process takes several weeks from start to finish. You'll need to gather documents, pass the knowledge test, schedule and pass the skills test with an approved examiner, and submit your medical certificate. Colorado does not issue a CDL on the same day you test — you'll receive it by mail after all requirements are met and your background check clears.

Unlike some states, Colorado allows you to test for multiple endorsements (such as passenger, tanker, or hazmat) in a single visit if you're prepared for all of them. However, you must pass the knowledge test for each endorsement separately, and you cannot take the skills test until you've passed all the knowledge tests you're pursuing.

Key Takeaways

  • You must hold a valid Colorado driver's license and pass a medical examination before you can test for a CDL.
  • The knowledge test covers general CDL rules, and separate tests are required for each endorsement you want to add.
  • The skills test includes a pre-trip inspection, basic control, and an on-road driving portion, and must be scheduled with an approved third-party examiner.
  • Colorado mails your CDL after all tests pass and your background check completes, which typically takes two to four weeks.
  • You can renew your CDL every four or eight years depending on your medical certification, and renewals can be done by mail if you have no violations.

Documents you need before you explore

Gather these documents before you visit a DMV office or testing location. You'll need proof of Colorado residency (a utility bill, lease, or mortgage statement dated within 60 days), your Social Security number, and a valid form of identification such as a passport or state ID. If you're not a U.S. citizen, you'll need proof of legal presence.

You also need a medical certificate from a Federal Motor Carrier Safety Administration (FMCSA)-certified medical examiner. This is not your regular doctor's visit — you must see a specific examiner on the FMCSA's National Registry. The examiner checks your vision, hearing, blood pressure, and other health factors required for commercial driving. The certificate is valid for 24 months, and you must have it before you can test.

If you're adding an endorsement to an existing CDL, you still need the medical certificate if yours has expired or will expire within 30 days of your test date. If your medical certificate is current and you're only adding endorsements, you may not need a new one, but confirm this with the DMV office handling your request.

The knowledge test: what to study and how it's scored

Colorado's CDL knowledge test covers the Commercial Driver's License Manual, which the DMV provides free at any office or online. The general knowledge test has 50 questions, and you must score at least 80 percent to pass. Each endorsement has its own test: passenger (20 questions), tanker (20 questions), hazmat (30 questions), and others, each with an 80 percent passing score.

You can take the knowledge test at any Colorado DMV office during regular business hours. There's no appointment needed for the written test, though wait times vary by location. The test is offered in English and Spanish. You'll receive your score when ready after you finish, and if you don't pass, you can retake it the same day or return another day at no additional cost.

The manual covers vehicle inspection, safe driving practices, braking systems, cargo handling, and hazmat rules depending on the endorsement. Most people study for one to two weeks before testing. The DMV also offers practice tests online, and many third-party websites and apps provide sample questions based on the official manual.

The skills test: scheduling and what the examiner checks

After you pass the knowledge test, you must schedule a skills test with a third-party examiner approved by Colorado. The DMV maintains a list of approved examiners on its website, organized by county. You contact the examiner directly to book a date — the DMV does not schedule skills tests for you. Wait times for examiners vary; some have openings within days, while others may have a wait of several weeks.

The skills test has three parts: a pre-trip inspection (where you walk around the vehicle and point out safety features and check systems), a basic control test (backing, turning, and parking in a closed course), and an on-road driving test (typically 30 to 45 minutes on public roads). You must bring the vehicle you'll be tested in, and it must meet all safety and equipment standards. The examiner provides a checklist of what to inspect and what maneuvers to perform.

You must pass all three parts to pass the skills test. If you fail one section, you can retake only that section with the same examiner, usually within a few days. Retake fees vary by examiner but typically range from $50 to $150 per attempt. Some examiners allow you to retake the entire test, while others let you retake only the failed section — confirm this when you book.

Medical certification and what disqualifies you

The FMCSA medical examination is stricter than a standard physical. The examiner checks your vision (you must have at least 20/40 in each eye, corrected or uncorrected), hearing, blood pressure, and medical history. Conditions that may disqualify you include uncontrolled diabetes, heart disease, sleep apnea (unless treated), and certain neurological disorders. Some medications also disqualify you, particularly those that cause drowsiness.

If you have a condition that might disqualify you, you can still pursue a CDL through a medical variance or waiver process. This requires additional testing and documentation from your doctor, and approval is not may provide. The process takes several months. Contact the DMV or an FMCSA-certified examiner to discuss your specific situation before you pay for a full medical exam.

Your medical certificate must be current when you take the skills test and when you receive your CDL. If your certificate expires before your CDL is issued, you'll need to renew it. Medical certificates are valid for 24 months from the date of the exam, though some examiners issue shorter validity periods (12 months) for certain conditions.

Background check and disqualifying offenses

Colorado runs a background check on all CDL applicants. Certain criminal convictions and traffic violations disqualify you permanently or temporarily. Permanent disqualifications include felonies involving drugs, crimes of violence, and certain traffic offenses like driving under the influence (DUI) or fleeing police. Some disqualifications last 10 years; others are permanent.

If you have a criminal history or serious traffic violations, contact the DMV before you test to confirm whether you're disqualified. The DMV can tell you whether your record bars you from a CDL. If you're disqualified, you cannot get a CDL in Colorado or any other state — CDL disqualifications are tracked nationally through the Commercial Driver's License Information System (CDLIS).

Traffic violations on your regular driver's license also affect your CDL. Multiple moving violations, reckless driving, or at-fault accidents within the past three to five years may delay your CDL issuance or result in denial. The DMV reviews your driving record as part of the background check.

Fees and timeline from start to CDL in hand

Colorado's CDL fees break down as follows: the knowledge test costs $20, the skills test fee goes to the third-party examiner (typically $100 to $200), the medical examination costs $75 to $150 depending on the examiner, and the CDL itself costs $30 for a four-year license or $60 for an eight-year license. If you're adding endorsements, each endorsement knowledge test costs $10. Total out-of-pocket cost typically ranges from $250 to $500.

The timeline from start to receiving your CDL in the mail is usually four to eight weeks. This assumes you pass all tests on your first attempt. Here's a typical sequence: week one, you get your medical certificate and pass the knowledge test; week two to three, you schedule and pass the skills test; week three to four, the DMV processes your process and runs the background check; week four to eight, your CDL arrives by mail. If you fail a test and need to retake it, add one to two weeks.

Expedited processing is not available for CDLs in Colorado. You cannot pick up your license at a DMV office — it is mailed to your address on file. If you need to change your address, update it with the DMV before your CDL is issued, or it will be mailed to your old address.

Renewal, medical recertification, and staying current

Colorado CDLs are valid for four or eight years depending on your medical certification. If your medical certificate is valid for the full license period, you can get an eight-year license. If your medical certificate expires before your CDL does, your CDL is valid only until your medical certificate expires, and you must renew both together.

To renew your CDL, you must obtain a new medical certificate from an FMCSA-certified examiner. You do not need to retake the knowledge or skills tests unless your CDL was suspended, revoked, or expired for more than one year. If your medical certificate is current and you have no violations, you can renew by mail or online without visiting a DMV office.

If your CDL expires and you do not renew it within one year, you lose your CDL status and must retake the knowledge and skills tests to get it back. Your regular driver's license remains valid, but you cannot drive a commercial vehicle until you retest and receive a new CDL.

Frequently Asked Questions

Can I get a CDL if I have a DUI on my record?

A DUI conviction permanently disqualifies you from holding a CDL in Colorado and all other states. This is a federal rule, not a state rule, and there is no waiver process. If you have a DUI, you cannot pursue a CDL.

Do I need to take the skills test in the same vehicle I'll drive for work?

Yes. The vehicle must match the class of CDL you're testing for (Class A, B, or C) and must have all required safety equipment. You cannot test in one vehicle and then drive a different type of vehicle for work without retesting.

What happens if I fail the skills test?

You can retake the failed section with the same examiner, usually within a few days. Retake fees vary by examiner. If you fail the same section three times, some examiners require you to wait 30 days before attempting again, though this varies.

Can I renew my CDL online or by mail?

Yes, if your medical certificate is current and you have no violations or suspensions. You'll need to submit your renewal process, medical certificate, and fee by mail or through the DMV's online portal. In-person renewal is required only if your CDL was suspended or revoked.

How long does the medical examination take?

A standard FMCSA medical exam takes 30 to 45 minutes. If the examiner finds a condition that requires additional testing or documentation, the appointment may take longer. Schedule at least one hour for the appointment.