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Free Colorado CDL HazMat Endorsement Practice Test 2025

Avg. pass rate on our CO tests: 62%.
Average pass rate for this test: 64%.
Moderate
7 min
Score distribution:
90-100=>17%
80-89=>27%
70-79=>30%
60-69=>19%
<60%=>7%
Avg. first-try score: 73%

Colorado. Ah! The freedom that comes with driving through the Rocky Mountains. Since you’re on this site, you must be interested in the sweet opportunities available once you’ve added the Hazardous Materials (Hazmat) endorsement to your Commercial Driver’s License (CDL). Why wouldn’t you be? This endorsement expands your job potential to an entire sector of organizations requiring this particular transport expertise. More jobs, more potential income. (If you’re younger than 21, you won’t be eligible for the Hazmat endorsement but don’t be discouraged. Check out our Double/Triple Trailers endorsement practice tests for intrastate driving.)

The Hazmat endorsement will permit you to transport materials that the U.S. government has deemed hazardous, like explosives, certain types of fuel, industrial chemicals, radioactive materials, and infectious substances. You might be worried and thinking: “Do I really want to transport radioactive materials?” Rest assured, the most important objective of this endorsement process is to ensure the utmost level of safety.

First, you’ll need to pass a Transportation Security Administration (TSA) fingerprinting and background check. The results from TSA can take weeks, so you’ll want to take advantage of that waiting period by preparing for the second major hurdle: the DMV knowledge test. The knowledge test is made up of 30 questions (24 out of 30 answers must be correct) and addresses federal regulations, substance handling, material packaging, and more (Colorado CDL Handbook 2025).

Free Colorado CDL HazMat Endorsement Practice Test 2025
Commercial Driver's License
Written in-house by our team Based on CO CDL Handbook
Steven Litvintchouk, M.S., Chief Educational Researcher at Driving-Tests.org

Reviewed for legal and handbook accuracy

Steven Litvintchouk

M.S., Chief Educational Researcher (ACES member)

Last verified for accuracy on

Andrei Zakhareuski, Co-founder & CEO, Driving-Tests.org

Test design and learning experience oversight

Andrei Zakhareuski

Co-founder & CEO, Driving-Tests.org

Questions are created and maintained by the Driving-Tests.org content team following our multi-layer editorial process and updated whenever the Colorado DMV changes its handbook or website information. Official sources we check: 

Real Colorado drivers who passed first try

Verified student reviews • Shared with permission

Well worth it!
I've been driving a 160bbls water tanker in the oil and gas fields of Colorado for about a year now. I got this to study for hazmat and doubles and triples. AWESOME! Easy to understand and very helpful! I also plan on using the motorcycle tests in the future. Thanks!
SPW
I finished the training course and practice tests all in one day.
Waited a few days for the DMV to receive my certificate (which they received immediately) then went and tested and got my Hazmat Endorsement! It was extremely easy and effortless. I was amazed at how simple this process was! Highly recommended!
LI
The ELDT hazmat was a breeze.
Really glad I went with driving-tests.org. I had even put the wrong DL number when sighing up so when I completed the course Fmcsa had the wrong DL in system. While at DMV I emailed the school and they where able to correct my mistake within minutes which made my experience even better.
RZ

About the Colorado CDL

In the Centennial State, there are multiple industries that require a Hazmat endorsement, including chemicals used in mining (such as explosives and solvents), propane, gasoline, and materials used in oil and gas production. Ball Corporation (Boulder) and Xcel Energy (Denver) are just two of the companies needing truck drivers with a Hazmat endorsement. Excited about the growing list of opportunities? Let’s get you prepared!

Our online DMV Colorado CDL Hazmat Endorsement practice tests are strategically designed to focus on the necessary information. We get straight to what’s relevant, and our practice tests mimic what you will face on the official DMV test. If you get a question wrong, you’re immediately provided with an explanation of why another answer choice is correct. Once you have your TSA results in hand and feel prepared, you’ll visit the DMV with the necessary documents, pay the fees, and confidently take the test.

More CO CDL test resources

  1. HazMat Test 1 (you are here)
  2. HazMat Test 2
  3. HazMat Test 3

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