ISA credentials, step by step: from Certified Arborist to Board Certified Master Arborist
Every credential the International Society of Arboriculture lists, what each one asks for, how its exam is built and which one has to come before which.
Checked against the sources at the bottom of this page on October 5, 2026. Rules, fees and pay change: the source has the last word.
ISA is a US-based body that runs credentials used in all five countries this site covers. Its pages call a certification a voluntary program administered by a non-governmental organization. Its program guides say the credentials do not represent licensure, registration or other authorization to practice. This page describes what the guides state. It is not advice on which one to take, and it does not teach any of the exam content.
The seven credentials on ISA's list
ISA's Types of Credentials page lists seven current credentials. It splits them into certifications and one qualification. A certification is meant to be learned through self-study and experience, and the exam stands apart from any course. A qualification, like TRAQ, comes with a course and an assessment of what that course taught.
| Credential | Kind | Needs first |
|---|---|---|
| Certified Arborist | Certification | Experience or education |
| Certified Tree Climber | Certification | Climbing experience |
| Certified Arborist Utility Specialist | Certification | Certified Arborist |
| Certified Urban Forest Professional | Certification | Several routes |
| Certified Tree Worker Aerial Lift Specialist | Certification | Lift experience |
| Board Certified Master Arborist | Certification | Certified Arborist and points |
| Tree Risk Assessment Qualification (TRAQ) | Qualification | A listed credential or degree |
ISA's current list shows no Municipal Specialist and no Climber Specialist. It shows Certified Urban Forest Professional and Certified Tree Climber. ISA's pages do not say that one name replaced another.
Fees and exam logistics that apply to most of them
On the exam side, ISA's Exam Information page gives one enrolment fee for every certification exam except the Board Certified Master Arborist: US$295 for ISA members and credential holders, and US$369 for everyone else. The Board Certified Master Arborist enrolment fee is US$495. The program guides add a separate application fee of US$40 for ISA members and credential holders and US$50 for others. You apply first, and you can enrol for an exam only once ISA approves the application.
Exams are held on paper through an ISA Certification Partner, or on computer at a Pearson VUE testing centre. ISA says it gives no refunds for exam enrolments and takes no registration on the day. The Certified Arborist guide lists a retake fee of US$120, and a retake no sooner than 30 days after the last try. The Certified Arborist exam is also offered in French (Canadian), Traditional Chinese and Spanish, according to ISA's common questions page.
Certified Arborist
This is the base of the ladder. The program guide, revised August 2025, asks for three years of full-time experience in arboriculture, or a mix of education and experience. One year counts as about 1,795 hours. The guide lists these mixes:
- A two-year associate degree with at least two courses directly related to arboriculture, plus two years of full-time experience.
- A four-year bachelor degree with at least four such courses, plus one year of full-time experience.
- An assessed certificate program of 900 hours, with at least 90 hours directly related to arboriculture, plus two years of experience. A program of 1,800 hours, with at least 180 hours directly related, needs one year of experience.
The exam is 200 multiple-choice questions in 3.5 hours. Twenty of the questions are unscored trial questions that candidates cannot pick out. The pass mark is 76 percent, and the guide says that mark can change when ISA reviews the exam. The written exam is split into ten areas, shown by share of questions.
| Area | Share |
|---|---|
| Safe Work Practices | 15% |
| Pruning | 14% |
| Tree Biology | 11% |
| Tree Risk | 11% |
| Tree Identification and Selection | 9% |
| Installation and Establishment | 9% |
| Diagnosis and Treatment | 9% |
| Trees and Construction | 9% |
| Soil Management | 7% |
| Urban Forestry | 6% |
Tree biology is 11 percent of the questions, and safe work practices is the largest area. The certification lasts three years. The guide gives two ways to renew: retake the exam, or log 30 continuing education units and pay US$220. Keeping certified covers renewals in detail.
Certified Tree Climber
This certification has a written exam and an outdoor skills test. The program guide, revised August 2025, asks for 18 months of climbing experience in arboriculture. It also asks for proof of hands-on CPR and first aid training and of practice aerial rescue training, both from within the year before you apply. The guide does not ask for Certified Arborist first.
- Written part: 65 multiple-choice questions in 90 minutes, pass mark 80 percent.
- Skills part: an outdoor practicum with 45 minutes allowed, pass mark 70 percent, with a minimum of 27 points. The guide says failing a task it marks as critical fails the skills test.
- Written areas by share: Safety 26 percent, Tree Climbing and Rigging 22 percent, Tree Removal 22 percent, Pruning 20 percent, Tree Identification and Health 10 percent.
The guide says people who took part in an ISA chapter, regional or international tree climbing championship may waive the skills exam if they meet every other requirement and the conditions on ISA's waiver form. The certification lasts three years. See climbing competitions for the events themselves.
Certified Arborist Utility Specialist
This is an add-on for electric utility vegetation management. The program guide, revised August 2025, asks for a current ISA Certified Arborist. It then asks for at least 2,000 hours of work experience directly in electric utility vegetation management in the two years before you apply, or 36 months of full-time utility work within 10 years. The exam is 115 multiple-choice questions in two hours, with a 75 percent pass mark. The guide says a Utility Specialist must stay a current Certified Arborist to renew.
| Area | Share |
|---|---|
| Electrical Knowledge | 29% |
| Electric Utility Pruning | 20% |
| Customer Relations | 20% |
| Integrated Vegetation Management | 18% |
| Program Management | 13% |
The guide on working near power lines covers the rules that govern line work itself.
Certified Urban Forest Professional
ISA's Urban Forest Professional program guide, revised August 2025, accepts one of three routes: being a Certified Arborist, or three years of documented experience managing the establishment and maintenance of urban trees, or a mix of relevant education and experience. Its example roles include city arborist, city forester and tree warden. The exam is 115 multiple-choice questions in two hours, with a 70 percent pass mark. The four areas are Urban Forest Management 32 percent, Arboricultural Practices 26 percent, Communication and Public Education 21 percent, and Administration, Policy and Planning 21 percent.
Certified Tree Worker Aerial Lift Specialist
This one is still on ISA's 2026 list, but its program guide is dated March 2020. The guide asks for 18 months of experience in arboriculture, with at least six of those months operating an aerial lift. The exam has a 65-question written part and a skills practicum of 45 minutes. Its written areas include Safety 18 percent, Pruning 18 percent and Electrical Hazard Awareness Program 14 percent. The guide lists fees that differ from the 2026 Exam Information page. See bucket trucks and EWPs for the machines.
Board Certified Master Arborist
This is the top of the ISA ladder. The program guide, revised May 2026, asks for a Certified Arborist in good standing and eight points from four categories.
| Category | Examples | Points |
|---|---|---|
| A, ISA credentials | Certified Arborist, 1 per year held; each other ISA credential, 1 | 1 each |
| B, education | Associate 1, bachelor 2, master 3, doctorate 4 | 1 to 4 |
| C, related credentials | ASCA Registered Consulting Arborist 3; state licence, European Tree Worker, SAF Certified Forester, TCIA Tree Care Specialist, 1 each | 1 to 3 |
| D, work experience | 1 point for every six years | 1 per six years |
Category A also gives 1 point for every 60 continuing education units above the required 30 in a three-year cycle. The exam is 165 multiple-choice questions in four hours, with a 70 percent pass mark and a retake fee of US$220. It covers 17 areas grouped as Science 37 percent, Practice 37 percent and Management 26 percent. The certification lasts three years and renews with 60 units, at least 10 in each group, and US$320.
Tree Risk Assessment Qualification
TRAQ is a qualification, not a certification. ISA's application guide, revised July 2026, describes a two-day in-person course followed by a half-day exam. The written exam is 110 multiple-choice questions in two hours, with a 75 percent pass mark. A one-hour outdoor performance exam goes with it. Written content is Assessment Methodology 61 percent, Basic Tree Assessment and Risk Analysis 21 percent, and Reporting 18 percent.
Holders of Certified Arborist, Board Certified Master Arborist, Certified Urban Forest Professional, Utility Specialist or Tree Climber are readily eligible. The guide also names a degree in arboriculture, urban forestry, forestry or horticulture, a national certificate in arboriculture, and an approved state or province licence or certification. Anyone else applies to ISA for an eligibility review, with the US$40 or US$50 application fee. Course prices are set by each host, not by ISA. The qualification is valid for seven years and is reinstated only by retraining and retesting. It has no continuing education route. The guide on tree risk assessment covers how risk work fits the wider trade.
How the order works
- Certified Arborist needs no other ISA credential. It is the entry point for Utility Specialist and Board Certified Master Arborist.
- Tree Climber and Aerial Lift Specialist ask for hands-on experience, not a Certified Arborist.
- Urban Forest Professional and TRAQ accept more than one route in.
- Board Certified Master Arborist comes last, because it needs a Certified Arborist in good standing plus points.
Other credentials that sit next to these
The Tree Care Industry Association runs its own safety credential, the Certified Treecare Safety Professional, described on TCIA's program page. It is a TCIA credential, not an ISA one. Certifications by country covers the national and trade qualifications in the five countries, and choosing a course covers how to compare providers.
Sources
- ISA, Types of Credentials, read October 5, 2026
- ISA, Exam Information, read October 5, 2026
- ISA, Common Questions, read October 5, 2026
- ISA, Certified Arborist program guide, revised August 2025
- ISA, Certified Tree Climber program guide, revised August 2025
- ISA, Certified Arborist Utility Specialist program guide, revised August 2025
- ISA, Certified Urban Forest Professional program guide, revised August 2025
- ISA, Certified Tree Worker Aerial Lift Specialist program guide, revised March 2020
- ISA, Board Certified Master Arborist program guide, revised May 2026
- ISA, Tree Risk Assessment Qualification application guide, revised July 2026
- TCIA, Certified Treecare Safety Professional, read October 5, 2026