Arborist Certification and Licensing: What You Actually Need

How to get an arborist certification

1. 1

   Get into tree work and start logging experience

   Begin as a groundworker or climber with a tree-care company, a utility vegetation contractor or a municipal forestry department. The ISA requires three years of full-time practical arboriculture experience, or a degree in arboriculture, horticulture, forestry or landscape architecture plus a shorter period, so the clock starts with your first crew.

2. 2

   Apply to the ISA and prepare for the exam

   Submit the Certified Arborist application with your experience verified by an employer or supervisor. Study across the full domain — soils and tree biology, nutrition, selection and installation, pruning, diagnosis and treatment, tree risk assessment, urban forestry, climbing and safe work practices — using the ISA's own study guide.

3. 3

   Pass the proctored Certified Arborist exam

   Sit the closed-book, multiple-choice exam at a computer-based testing centre. The pass mark is scaled by the ISA rather than a flat percentage. There is no code book to bring: unlike the building trades, arboriculture has no adopted code exam, so the test is drawn from the published body of knowledge.

4. 4

   Get the state licences the work actually requires

   If you will apply any pesticide, obtain your state's commercial pesticide applicator licence from the department of agriculture, with the category endorsements matching your work — ornamental and turf, right-of-way, or forest pest control. If you work in a state that licenses arborists, apply for that licence too; national certification does not substitute for it.

5. 5

   Add specialisms and recertify every three years

   Consider the Tree Risk Assessment Qualification for report work, line-clearance training for utility contracts, or the Board Certified Master Arborist credential later in your career. Maintain your certification with continuing education units on the ISA's three-year cycle, and renew your pesticide licence on the state's own schedule.

Arborist certification requirements

Because this is a certification rather than a licence in most of the country, the requirements come from the International Society of Arboriculture and from state pesticide law rather than from a trade board. To work as a credentialed arborist you generally need:

How much an arborist certification costs

There is no state licence fee in most states. What you pay for is the ISA exam, recertification, and — where it applies — your state pesticide applicator licence:

The arborist certification exam

The ISA Certified Arborist exam is a proctored, closed-book multiple-choice test delivered at computer-based testing centres, covering the full domain of arboriculture from soil and tree biology through pruning, diagnosis, risk assessment and safe work practices. The pass mark is scaled by the ISA rather than being a flat percentage, and results are usually available promptly. There is no code book to bring — unlike the building trades, arboriculture has no adopted code exam. The separate state pesticide applicator exam is administered by your state's department of agriculture and covers pesticide law, safety, calibration and the categories you apply for.

How long it takes to get licensed

The three-year experience requirement is the gate. Once you meet it, application review and exam scheduling take weeks rather than months, and certification is issued shortly after you pass.

Arborist certification types: the full ladder

There is no journeyman-to-master ladder in arboriculture. What exists instead is a set of ISA certifications and qualifications by specialism, plus the state licences that apply to specific activities such as pesticide application and, in a few states, tree work generally.

ISA certification vs State licence: arborist certification

Arborist certification reciprocity between states

ISA certification is portable by design: it is a single credential recognised across the United States and internationally, so there is nothing to reciprocate. State licences are the opposite. Where a state runs an arborist or tree-expert licence, national certification does not substitute for it and you must apply to that state directly. Pesticide applicator licences do reciprocate in some states through agreements between departments of agriculture, but the categories and the law portion of the exam are usually state-specific, so plan on re-testing at least in part. Confirm with the destination state's department of agriculture before taking work there.

Arboristsalary & job outlook

Tree trimmers and pruners earn a median of about $50,960 per year ($24.50/hour), and certified arborists doing consulting, risk assessment and utility contract work sit above that, while crew pay in general grounds maintenance sits below it. Employment is projected to grow 3.3%, with roughly 7,400 openings a year. See the full arborist salary guide for pay by state, city and experience level.

Arborist certification requirements by state

This table is the one to read closely, because the honest answer differs by state. Only a handful of states license arborists at all; everywhere else, ISA certification plus a pesticide applicator licence is the real credential set.

Where no arborist licensing authority is named, that state does not license arborists and the ISA certification is a voluntary professional credential — but the state pesticide applicator licence still applies to anyone applying pesticides, and many municipalities require a local tree-contractor registration. Verify with the state department of agriculture and the local jurisdiction before bidding work.

Browse all state guides

Arborist certification FAQs

International Society of Arboriculture, Certified Arborist credential · U.S. EPA, Certification of Pesticide Applicators · OSHA, 29 CFR 1910.269 (Electric power generation, transmission and distribution) · U.S. Bureau of Labor Statistics, OEWS May 2025 (37-3013). Requirements and fees are set per state and change, confirm with your state board before applying.

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