# PassArborist > PassArborist is a mobile study app for the ISA Certified Arborist® exam: 900+ exam-style practice questions across all 10 exam domains, 200-question mock exams, flashcards and an AI tutor that explains every answer. PassArborist is an independent mobile app (iPhone and iPad) for candidates preparing for the ISA Certified Arborist® exam administered by the International Society of Arboriculture (ISA). It is not affiliated with ISA. On the App Store it is listed as "ISA Arborist Exam Prep 2026". ## Key facts - Practice questions: 963, grouped into the 10 ISA exam domains, each with a written explanation - Mock exams: full-length, 200 questions drawn from every domain - Flashcards: 286 key arboriculture terms - AI tutor: explains why an answer is right, with follow-up questions - Quiz modes: quizzes of 10 to 100 questions by domain, Survival (three lives) and Infinite - Also: saved questions and flashcards, a searchable question cheat sheet, daily streak, daily quiz reminder, exam-date countdown - Price: free to download; first quiz free; PassArborist Pro in-app purchase unlocks unlimited quizzes, mock exams and more AI tutor use - iOS: https://apps.apple.com/us/app/isa-arborist-exam-prep-2026/id6761324717 - Contact: contact@znosnie.com ## Question bank by exam domain The app's domains and weightings follow ISA's Certified Arborist exam outline: - Tree Biology (11% of the exam): 108 questions. Physiology, growth processes, reproduction and adaptation. - Tree Identification and Selection (9% of the exam): 100 questions. Species identification, growth habits and site suitability. - Soil Management (7% of the exam): 100 questions. Soil composition, nutrients, drainage and the rhizosphere. - Installation and Establishment (9% of the exam): 97 questions. Planting, transplanting, establishment care and irrigation. - Pruning (14% of the exam): 92 questions. Pruning methods, objectives, tools and wound response. - Diagnosis and Treatment (9% of the exam): 100 questions. IPM, plant health care, abiotic disorders, pests and disease management. - Trees and Construction (9% of the exam): 100 questions. Tree protection zones, critical root zones, ANSI standards and post-construction care. - Tree Risk (11% of the exam): 97 questions. Risk assessment, failure types and mitigation. - Safe Work Practices (15% of the exam): 88 questions. Climbing, PPE, tool safety and electrical hazard awareness. - Urban Forestry (6% of the exam): 81 questions. Tree inventories, ecosystem services and managing the urban forest. ## About the ISA Certified Arborist exam - 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 (https://www.isa-arbor.com/portals/0/assets/pdf/certification-applications/cert-application-certified-arborist.pdf) - Official page: https://www.isa-arbor.com/Credentials/Types-of-Credentials/ISA-Certified-Arborist ## Pages - [Home](https://passarborist.com/): app overview, exam overview, question bank by domain, features, FAQ - [Blog](https://passarborist.com/blog): ISA arborist exam study notes and plans - [Tools](https://passarborist.com/tools): free tools for arborist exam candidates - [Contact](https://passarborist.com/contact): support, question corrections, partnerships - [Welcome to the PassArborist Blog: ISA Arborist Exam Study Notes](https://passarborist.com/blog/welcome): 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. ## Free tools - [ISA arborist practice test](https://passarborist.com/tools/arborist-practice-test): Take a free 20-question ISA Certified Arborist® practice test covering all 10 exam domains, with the answer and an explanation for every question. ## FAQ ### 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.