ISA-CA Exam Domains 2026: Complete Guide to All 7 Content Areas
Understanding the ISA-CA exam domains is the foundation of effective exam preparation.
Domain Deep Dives for the ISA Certified Arborist (ISA-CA) exam - 8 in-depth guides to help you prepare with confidence. Browse all study resources or jump straight into a guide below.
Understanding the ISA-CA exam domains is the foundation of effective exam preparation.
Tree Biology represents 7% of the ISA Certified Arborist exam, translating to approximately 12-14 questions out of the 175 scored items.
Domain 2 of the ISA Certified Arborist exam focuses on soil science, representing 6% of the total exam content.
Water management represents 5% of the ISA Certified Arborist exam, translating to approximately 9-10 questions out of 175 scored items.
Domain 4 of the ISA-CA exam focuses on Tree Nutrition and Fertilization, comprising 5% of the total exam content.
Domain 5 of the ISA Certified Arborist exam focuses on the critical skills needed to select appropriate trees for specific sites and install them...
Pruning represents one of the most critical and frequently tested domains on the ISA Certified Arborist exam, comprising 12% of the total exam content.
Domain 7: Diagnosis and Treatment represents the largest single content area on the ISA Certified Arborist exam, accounting for 14% of all questions.
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