Free tool
Trees and yards
Tree picker
Filter common US trees by region, mature height, growth rate and storm risk to see which fit your yard.
Open the tool: Tree pickerCareers guide
How to become an arborist in the US, step by step
An arborist is a tree professional: part scientist, part tradesperson. Most get there through hands-on work and study, then a credential. This guide lays out the path in plain words, with the official sources to check.
By Umair Nawaz, Lirevon. Last reviewed: October 2026. Lirevon is not affiliated with the ISA or TCIA.
What an arborist does
Diagnose problems
Look at leaves, bark, roots and soil to find pests, disease and stress, and say what can be done.
Judge risk
Decide how likely a tree or limb is to fail and what it could hit. Some arborists hold the ISA Tree Risk Assessment Qualification (TRAQ) for this.
Plan care
Recommend pruning, cabling, soil care, plant health care treatments or removal, and explain why.
Protect trees near building work
Plan how to keep roots safe during construction, often using the critical root zone as a guide.
Write reports
Some arborists write reports for homeowners, cities, builders or insurance cases.
See also the arborist reports guide and the plant health care guide.
Arborist, tree worker, tree company
These words get mixed up. A tree worker does the physical work: climbing, cutting, rigging, chipping. An arborist knows tree health and risk and decides what work is right. A tree company is the business. Many people are both worker and arborist, and the best tree companies have at least one arborist on staff. For homeowners, we explain the difference on arborist vs tree service.
The steps, in order
-
Step 1
Get hands-on experience
Most arborists start on a crew, as a groundworker or climber, or in a city or utility tree program. You learn trees by working with them every day.
-
Step 2
Learn the science
Study tree biology, identification, soils, pests, diseases and pruning standards. Books, extension courses, community college classes and ISA study material all help.
-
Step 3
Meet the credential rules
The ISA Certified Arborist credential asks for a set amount of full-time tree care experience, or a related degree plus some experience. Check the ISA site for the current rules.
-
Step 4
Pass the exam
The ISA exam covers areas such as tree biology, soil, pruning, diagnosis, risk and safety. Study the official guide and take practice questions.
-
Step 5
Keep it current
ISA credentials are kept active with continuing education and renewal. Check the ISA site for the current cycle.
-
Step 6
Grow your focus
Add TRAQ, a specialty credential or the Board Certified Master Arborist later, or move into plant health care, consulting or city work.
Official sites: isa-arbor.com (credentials and study material) and tcia.org (safety training and company programs). Our certifications page compares them.
What to study
- Tree biology: how trees grow, move water and wall off decay.
- Tree identification: common species in your region, in summer and winter.
- Soil and roots: compaction, drainage and why most roots are shallow.
- Pests and diseases: the main problems in your area, and how extension services track them.
- Pruning standards: the ANSI A300 standard for tree care practices.
- Safety: the ANSI Z133 standard for tree work.
Free places to start on our site: the tree species library, the pests and diseases library and the tree care glossary. Your state university extension service is another strong free source.
Where arborists work
Tree service companies
Sell and plan work, diagnose problems and lead crews. This is the most common path.
Plant health care
Focus on keeping trees healthy with soil care, treatments and monitoring. Pesticide work usually needs a state license.
Utility line clearance
Keep trees clear of power lines. This needs special training and qualification.
Cities and parks
Care for street and park trees, plan planting and manage tree programs.
Consulting
Write reports, appraise trees and help with construction and legal cases. Usually needs many years of experience.
Pay
Pay varies by region, role and credentials; check the BLS. The US Bureau of Labor Statistics publishes official wage data for tree trimmers and pruners in its Occupational Outlook Handbook. Arborists in sales, consulting or city roles may be counted in other groups, so ask employers in your area too.
For owners: why an arborist on staff helps
A credentialed arborist helps you sell the right work, answer the hard questions homeowners ask and win jobs that need a report. Supporting a good climber or crew leader through the ISA exam is often cheaper than hiring one. Then show the credential, honestly, on your website and Google Business Profile. Our guide to showing certifications explains how.
Plan the cost with the hiring cost calculator and read the hiring and crews guide. When you are ready to turn that trust into calls, see our services, pricing or get a free audit.
Common questions
Do I need a degree to become an arborist?
No. Many arborists learned on the job and earned the ISA Certified Arborist credential through work experience. A degree in arboriculture, forestry or horticulture can shorten the experience the ISA asks for.
How long does it take to become a certified arborist?
It depends on your experience and study. The ISA sets an experience rule before you can sit the exam. Check the ISA website for the current requirement.
Is an arborist the same as a tree surgeon?
Tree surgeon is a common term, especially outside the US, for people who do tree work. In the US, arborist usually means someone trained in tree care, and ISA Certified Arborist is a specific credential.
Is arborist a licensed job?
Some states and cities have license or registration rules for tree work or pesticide use; many do not. A certification is not a license. Check your state and city. This is a short explanation, not legal advice.
What is the hardest part of the ISA exam?
People find different parts hard. Many say tree biology, soil science and diagnosis take the most study. Use the official ISA study guide.
Can I be an arborist if I do not want to climb?
Yes. Many arborists work in plant health care, consulting, city programs or sales and rarely climb. Field experience still helps you understand the work.
What is TRAQ?
The ISA Tree Risk Assessment Qualification. It trains arborists to assess tree risk with a standard method. The ISA calls it a qualification, not a certification.
How much do arborists earn?
Pay varies by region, role and experience. Check the US Bureau of Labor Statistics for official wage data, and ask employers how credentials affect pay.
Should I join the ISA or TCIA?
The ISA focuses on people and tree science; the TCIA focuses on tree care companies and safety. Many professionals use both. Check each site for what membership includes.
Does a certified arborist help a tree company get customers?
It can build trust. Homeowners often look for the words certified arborist. Show the credential only for the person who holds it, on your website and Google Business Profile.
This page is general information, not legal or career advice. Check the ISA and TCIA websites for current rules, fees and exams.
More career guides
See all tree care careers and ISA and TCIA certifications. Own a tree service? Get a free audit.