CDL state guide
Colorado CDL Requirements — Complete Guide (2026)
Get your CDL in Colorado. Learn the knowledge test requirements, fees, minimum age, CLP process, and where to apply for your Colorado Commercial Driver's License. This guide is a planning page built from official Colorado DMV source links, with reminders to verify final fees and test availability before you apply.
Quick answer
Start with the CLP, medical certification, and the General Knowledge test
Most Colorado CDL applicants need a valid regular driver license, must be at least 18 for intrastate commercial driving or 21 for interstate operation, and must pass the required knowledge tests before the CDL skills test. The CLP must be held at least 14 days before skills testing.
At a glance
Colorado CDL at a glance
| Minimum age | 18 intrastate / 21 interstate |
|---|---|
| General Knowledge test | 50 questions, 80% to pass |
| CLP fee | Instruction permit: $19 |
| CDL fee | Commercial driver license: $17.50 |
| CLP holding period | 14 days minimum before the CDL skills test |
| CDL valid for | 4 years |
| Issuing agency | Colorado DMV |
Classes
CDL classes available in Colorado
Colorado follows the federal CDL class structure: Class A for qualifying combination vehicles, Class B for many single heavy vehicles, and Class C for certain passenger or hazardous-material vehicles below Class A/B thresholds. The class you apply for should match the vehicle you will test in and the commercial work you plan to do.
Colorado applicants should study mountain grades, runaway ramps, winter conditions, and brake management in addition to standard CDL topics.
Process
How to get your CDL in Colorado
- Confirm eligibility with Colorado DMV and make sure your regular driver license is valid.
- Complete any required DOT medical certification and keep your medical status current.
- Study the official Colorado CDL manual before taking knowledge tests.
- Pass General Knowledge and any class or endorsement tests needed for your CLP.
- Hold the CLP for at least 14 days and practice with a qualified CDL holder when required.
- Complete ELDT when it applies, especially for first-time Class A/B, Hazmat, Passenger, or School Bus paths.
- Colorado CDL applicants should confirm skills-test locations and whether third-party testing is used.
Use Colorado DMV CDL and locations pages to confirm testing, medical certification, and appointment options.
Knowledge tests
CDL knowledge tests in Colorado
The General Knowledge test is the common starting point. Additional tests depend on your class, vehicle, air-brake system, cargo, and endorsements. Test counts below are practical planning figures; verify the current testing screen and endorsement list with Colorado DMV.
| Test | Questions | Passing score | When it matters |
|---|---|---|---|
| General Knowledge | 50 questions | 80% | Required starting test for most CDL applicants. |
| Air Brakes | Usually 25 questions | 80% | Needed if the vehicle has air brakes and you do not want an air-brake restriction. |
| Combination Vehicles | Usually 20 questions | 80% | Common for Class A combination vehicle applicants. |
| Hazardous Materials | Usually 30 questions | 80% | Requires extra federal/TSA and ELDT steps when applicable. |
| Passenger | Usually 20 questions | 80% | Needed for passenger-carrying commercial vehicles. |
| School Bus | Usually 20 questions | 80% | Usually requires Passenger plus school-bus-specific testing. |
| Tank Vehicle | Usually 20 questions | 80% | Needed for qualifying tank vehicles or certain liquid/gas cargo. |
Endorsements
CDL endorsements in Colorado
Colorado CDL applicants can usually pursue the standard federal endorsements: H Hazardous Materials, N Tank Vehicle, P Passenger, S School Bus, T Double/Triple Trailers, and X Tanker plus Hazmat. Hazmat, Passenger, and School Bus paths can involve extra checks, ELDT, or skills-test requirements.
Fees
Colorado CDL fees
| CLP application fee | Instruction permit: $19 |
|---|---|
| CDL application/license fee | Commercial driver license: $17.50 |
| Skills test fee | May be separate if a third-party skills tester is used; confirm with Colorado DMV or the approved tester. |
| Endorsement fees | Often listed separately by endorsement or transaction; verify before adding Hazmat, Passenger, School Bus, Tanker, or other endorsements. |
| Renewal fee | Renewal cost can differ from original issuance. Check your state fee schedule before renewal. |
Official resources
Official Colorado CDL resources
Study path
Next steps for Colorado CDL prep
FAQ
Colorado CDL questions
How old do I need to be to get a CDL in Colorado?
Plan for 18 for intrastate commercial driving and 21 for interstate driving, hazardous materials, and many cross-state jobs. Verify final restrictions with Colorado DMV.
How long do I have to hold a CLP in Colorado?
Federal CDL rules require at least 14 days before taking the CDL skills test. Colorado may add scheduling or documentation steps.
What score do I need on CDL knowledge tests?
Use 80% as the planning benchmark for CDL knowledge tests unless Colorado DMV states a different rule for a specific test.
Where should I verify Colorado CDL fees?
Use the official Colorado DMV CDL page, fee schedule, or office because CLP, CDL, endorsement, renewal, duplicate, and skills-test fees can be listed separately.
Other state CDL guides
Compare nearby state CDL rules
Commercial driver license fees, testing offices, and skills-test scheduling can differ across state lines. Use these related state pages when comparing CDL paths.
Source note: Last checked June 29, 2026 against the official Colorado DMV CDL page and linked manual/office resources. US Permit Prep is independent and not affiliated with any DMV, state agency, or FMCSA.
