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Iowa · IA
Iowa CDL
Knowledge Test
Everything you need to pass the Iowa CDL knowledge test. The same FMCSA-standardized questions used across all 50 states.
Total CDL fee
$16
CLP wait
14 days
Min age
18+
To pass
80%
CDL Test Sections
The CDL knowledge test is administered by section. Passing score for all sections is 80%.
✓
General KnowledgeREQUIRED
50 questions · Pass with 40+
A
Air Brakes
25 questions · Pass with 20+
C
Combination Vehicles
20 questions · Pass with 16+
H
Hazardous Materials (HazMat)
30 questions · Pass with 24+
D
Doubles & Triples
20 questions · Pass with 16+
T
Tanker Vehicles
20 questions · Pass with 16+
P
Passenger Transport
20 questions · Pass with 16+
S
School Bus
20 questions · Pass with 16+
What to Know About CDL in Iowa
Iowa CDL fees: approximately $16 total — the lowest CDL fees in the country
Iowa is a major agricultural state — grain, livestock, and farm equipment trucking dominate
Agricultural exemptions for farm operations are widely applicable in Iowa
Iowa's highway system is a major north-south and east-west freight corridor (I-80, I-380)
CDL holders must hold their CLP for at least 14 days before the skills test
Iowa CDL knowledge tests are computerized at Iowa DOT driver's license stations
Legal notice
This information is provided for educational purposes only. Requirements can change. Always verify with Iowa Department of Transportation (DOT) for the most current information.
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