Trade certification · Arboriculture
ISA Certified Arborist — Practice Exam
The ISA Certified Arborist written exam: tree biology, identification, soil, planting, pruning, diagnosis, construction, tree risk, safe work practices and urban forestry, weighted like the official outline.
Questions last checked against the official sources on October 6, 2026.
The real exam at a glance
- Questions
- 200 multiple choice (180 scored)
- Time
- 3.5 hours
- Pass mark
- 76%
- Eligibility
- 3 years' experience, or education plus experience
What you'll practise
Try a question
A mature, stressed tree has a 20-inch trunk diameter. What is its Protected Root Zone radius?
- 10 feet
- 20 feet
- 30 feet
- 40 feet
Show the answer
C. 30 feet — 20 inches × 1.5 = 30 feet.
Sample questions by topic (in English)
- Installation and establishment
- Soil management
- Pruning
- Tree identification and selection
- Diagnosis and treatment
- Trees and construction
- Tree risk
- Safe work practices
- Urban forestry
- Tree biology
Ask the examiner
Ask about this exam: why an answer is wrong, a grammar point, or “quiz me on …”.
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Questions about the ISA Certified Arborist
Is this the official ISA Certified Arborist?
No. Semplr is independent and not affiliated with the exam body. We write every question ourselves, in the official format and at the official level.
What is the real ISA Certified Arborist like?
Questions: 200 multiple choice (180 scored). Time: 3.5 hours. Pass mark: 76%. Eligibility: 3 years' experience, or education plus experience.
How is my practice marked?
Instantly. You see your score against the pass mark, and an explanation for every question — including the ones you got right.
Can I take it on my phone?
Yes. The whole mock exam works on a phone, and your progress is saved in your browser.
Ready for a full run?
One sitting, real timing, then your score against the pass mark.
Start the free mock exam