Pass the ISA arborist exam.
Ten minutes a day.
The study app built for the ISA Certified Arborist® exam. Practice between jobs, in the truck or on your lunch break.
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963practice questions
IncludesAI tutor
- 963 practice questions
- 200-question mock exams
- AI tutor on every question
Everything you need to pass
One app, built for one exam. Practice, review and rehearse test day, all from your phone.
AI tutor
Tap “Explain” on any question for an arborist-focused explanation of why the right answer is right. Ask follow-ups until it clicks, from CODIT to cambium.
Full-length mock exams
Pro200 questions drawn from every domain, the same length as the real exam. Every attempt and its score are saved, so you can watch your results climb.
Survival & Infinite modes
Survival gives you three lives: every wrong answer costs a heart. Infinite has no lives and no pressure, so you can practice as long as you like.
Daily streak & reminders
A daily streak and an optional quiz reminder keep the habit alive. Ten focused minutes beat a weekend of cramming.
286 key-term flashcards
The terms you must know cold, from xylem and phloem to apical dominance. Save the hard ones for later.
Saved questions & cheat sheet
Bookmark tricky questions for a last-minute review, or search every question and its answer in the built-in cheat sheet.
How it works
Set your exam date
Tell PassArborist when you test. Your home screen counts down the days, so every session has a deadline.
Practice by domain
Quizzes of 10 to 100 questions drawn from 963 exam-style questions, organized by the 10 ISA exam domains, each with a written explanation.
Ask why
Stuck? The AI tutor explains the reasoning in plain language. Save the questions you miss and come back to them.
Sit a mock exam
Rehearse test day with a 200-question mock exam, the same length as the real thing, and see where you stand.
What is the ISA Certified Arborist exam?
The professional credential for tree care.
The ISA Certified Arborist® exam is run by the International Society of Arboriculture and tests the knowledge arborists use every day: tree biology and identification, soil, planting, pruning, diagnosis, trees and construction, tree risk, safe work practices and urban forestry. Candidates need about three years of full-time tree care experience, or a qualifying degree or training program plus experience.
- Credential
- ISA Certified Arborist®
- Awarded by
- International Society of Arboriculture (ISA)
- Format
- 200 multiple-choice questions, four options each
- Time allowed
- 3.5 hours (210 minutes)
- Passing score
- 76 percent
- Eligibility
- 3 years of full-time arboriculture experience, or a qualifying degree or training program plus experience
- Delivery
- Computer-based at a Pearson VUE test center, or an exam run by an ISA Certification Partner
- Valid for
- 3 years; renew with 30 CEUs or by retaking the exam
Source: ISA Certified Arborist Program Guide (revised August 2025). Details change, so confirm on the official ISA website.
963 questions.
All 10 exam domains.
Practice one domain at a time or mix them all. The app follows ISA’s exam outline, weightings included, and every question has a written explanation.
Domain 01 · 11% of the exam· 108 questions
Tree Biology
Physiology, growth processes, reproduction and adaptation.
108questions
Domain 02 · 9% of the exam· 100 questions
Tree ID & Selection
Tree Identification and Selection
Species identification, growth habits and site suitability.
100questions
Domain 03 · 7% of the exam· 100 questions
Soil Management
Soil composition, nutrients, drainage and the rhizosphere.
100questions
Domain 04 · 9% of the exam· 97 questions
Installation
Installation and Establishment
Planting, transplanting, establishment care and irrigation.
97questions
Domain 05 · 14% of the exam· 92 questions
Pruning
Pruning methods, objectives, tools and wound response.
92questions
Domain 06 · 9% of the exam· 100 questions
Diagnosis & Treatment
Diagnosis and Treatment
IPM, plant health care, abiotic disorders, pests and disease management.
100questions
Domain 07 · 9% of the exam· 100 questions
Trees & Construction
Trees and Construction
Tree protection zones, critical root zones, ANSI standards and post-construction care.
100questions
Domain 08 · 11% of the exam· 97 questions
Tree Risk
Risk assessment, failure types and mitigation.
97questions
Domain 09 · 15% of the exam· 88 questions
Safe Work
Safe Work Practices
Climbing, PPE, tool safety and electrical hazard awareness.
88questions
Domain 10 · 6% of the exam· 81 questions
Urban Forestry
Tree inventories, ecosystem services and managing the urban forest.
81questions
Ten minutes a day.
Exam-ready in weeks.
Reading the study guide isn't the same as answering exam questions. PassArborist turns every spare ten minutes into exam-style practice with instant feedback.
Your first quiz is on us.
From the blog
Study plans and strategy for the ISA Certified Arborist exam.
News · October 28, 2026 · 3 min read
Welcome to the PassArborist Blog: ISA Arborist Exam Study Notes
What the PassArborist blog will cover, the ISA Certified Arborist exam at a glance, and how to use these notes alongside the app and the free practice test.
Read articleFrequently asked questions
What is the ISA Certified Arborist exam?
It is the certification exam for professional arborists, run by the International Society of Arboriculture (ISA). Passing it earns the ISA Certified Arborist® credential, which shows a standardized level of knowledge across 10 areas of tree care, from tree biology to safe work practices.
How many questions are on the ISA Certified Arborist exam?
The exam has 200 multiple-choice questions, each with four possible answers, and you have 3.5 hours (210 minutes) to finish. The current passing score is 76 percent. Always confirm current details in ISA’s Certified Arborist Program Guide.
Who is eligible to take the exam?
ISA requires three years of full-time experience in arboriculture, or a combination of education and experience: for example, a two-year associate degree with arboriculture courses plus two years of experience, or a four-year bachelor degree plus one year. ISA approves your application before you can enroll for an exam.
What is PassArborist?
PassArborist is a mobile app built only for the ISA Certified Arborist® exam. It includes 963 exam-style practice questions organized by the 10 exam domains, 200-question mock exams, 286 key-term flashcards, Survival and Infinite quiz modes, a daily streak and an AI tutor that explains the reasoning behind every answer. It is on the App Store for iPhone and iPad.
How long should I study for the arborist exam?
ISA does not set a study time, and it depends on your field experience. Short daily sessions work better than cramming: PassArborist is built around short quizzes by domain, saved questions, flashcards and a countdown to your exam date.
Is PassArborist free?
PassArborist is free to download on the App Store, and your first practice quiz is free. PassArborist Pro, an in-app purchase, unlocks unlimited quizzes, the full-length mock exams and more AI tutor use.
Is PassArborist affiliated with ISA?
No. PassArborist is an independent study tool and is not affiliated with, sponsored or endorsed by the International Society of Arboriculture. ISA Certified Arborist® is a registered certification mark of ISA.
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