How Many Questions Are on the Colorado CDL General Knowledge Test?
50 questions. That count is set by 49 CFR Part 383, a federal regulation every state follows identically — it has nothing to do with anything Colorado itself decides for its CDL program.
What Colorado does control, and what it doesn't
The DMV can't touch the question count or the passing threshold on the General Knowledge test — those come from Washington. What Colorado does set is everything around the test: the $19 CLP fee, the driver license offices where you sit for it, and the one-year, non-renewable permit window that starts once you pass.
Depending on the class and endorsements you're after, Air Brakes and Combination Vehicles tests may stack on top of General Knowledge, each with its own 50-ish question count.
Why the one-year clock matters more than the question count
Since a 2024 rule change, Colorado's CLP can't be renewed at all — pass the test, get your one shot at a full year, and that's it.
That makes the exact number of questions almost beside the point: the real planning constraint is fitting ELDT, the 14-day minimum hold, and the skills test inside that single non-renewable year, not memorizing whether it's 48 or 52 questions.
How our practice tests are structured
Our practice tests break results down by topic immediately, so a weak spot doesn't stay hidden inside an otherwise decent overall score.
Each question includes an explanation and a source reference, so you learn why an answer is correct instead of just memorizing a letter.
Frequently Asked Questions
Does Colorado set its own CDL General Knowledge question count?
No — 49 CFR Part 383 fixes it at 50 questions nationwide, identical in every state.
What does Colorado actually control about the CDL process?
The $19 CLP fee, where you test, and the one-year non-renewable validity window — not the federal test format itself.
Can a Colorado CLP be renewed if I run out of time?
No. As of a 2024 rule change, it's valid for one year with no renewal option, so plan ELDT and the skills test well within that window.
Ready to put this into practice?
Start a free Colorado cdl practice testLast reviewed: 2026-07-21