Free Colorado CDL HazMat Practice Test 2025

Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
Based on 2025 CO commercial driver's license manual
Triple-checked for accuracy
Updated for March 2025

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).

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.

7 min to complete

Available in EN and ES

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What to expect on the actual CO DMV exam

questions

correct answers to pass

80%

passing score

Helpful links

CO DMV website

Official Colorado CDL manual (2025)

More CO DMV Written Exam Resources

CO CDL HazMat Test (you are here)

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Explore our rigorous, multi-tiered verification process that ensures each question mirrors the official manual for unparalleled accuracy.

Written by Andrei Zakhareuski Updated over a week ago

At Driving-Tests.org, we understand the importance of reliable and accurate practice tests to help you prepare for your DMV exam. That's why we've developed a meticulous process to create and continually update our practice questions, ensuring they reflect the most current driving laws and regulations.

Here's an inside look at how we maintain the highest quality in our practice tests.

Content Creation and Verification Process

Alignment with Official Manuals:
Every question we develop is based on the most recent version of each state's official driving manual. Our team regularly monitors each state DMV's website for the latest updates to ensure our practice tests are always aligned with the most current information.
Community Feedback Integration:
We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation.
Expert Content Creation:
Our in-house editor, Steven, who has extensive experience in driver education, crafts each question with precision. He conducts a thorough review of each question against the official manuals to ensure accuracy.
Rigorous Review Process:
Once Steven has finalized a set of questions, our team conducts a joint review session. This second level of scrutiny involves content accuracy, proofreading, and fact-checking to eliminate any errors.
User Feedback Mechanism:
After a question goes live on our site, we keep the lines of communication open. Each question features a feedback button, inviting users to report any issues or errors. This continuous feedback loop allows us to address and rectify any concerns promptly.
Responsive Updates:
In line with our commitment to accuracy, we quickly update our practice questions to reflect any changes in the DMV manuals. Additionally, we update the free electronic copy of the state's driver's license manuals on our site, typically within a few days after the DMV publishes them.

Our thorough quality control process ensures that you have access to practice tests that are as accurate and up-to-date as possible. We believe in the power of well-prepared drivers and are dedicated to providing you with the best study tools to help you succeed on your DMV exam.

FREE Colorado CDL HazMat Practice Test

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