Do You Need an Arborist License in Massachusetts?

Last updated: August 24, 2026

Massachusetts does not issue a general arborist license, so there is no credential here to go and get. What there is instead is one of the older and stricter public tree laws in the country. Under MGL Chapter 87, every tree within a public way or on its boundaries is a public shade tree, and such a tree may not be cut, trimmed or removed by anyone other than the tree warden without a written permit — preceded by a public hearing, notice nailed to the tree, and an advertisement in the local paper. For a tree business, that law matters far more than any missing license.

What Massachusetts Actually Requires

• No general state arborist license. Massachusetts issues none. Massachusetts Certified Arborist and ISA certification are professional credentials, not state licenses.
• ★ A written permit from the tree warden before touching a public shade tree. Under Chapter 87, public shade trees shall not be cut, trimmed or removed, in whole or in part, by any person other than the tree warden or his deputy without one.
• Know what is protected: all trees within a public way or on the boundaries thereof are public shade trees.
• A public hearing before removal, with notice of the size, type and location of the tree posted in at least two public places and on the tree itself, at least seven days before the hearing, and published in a local newspaper once in each of two successive weeks, the first no less than seven days before.
• A consolidated hearing where Chapter 40 Section 15C also applies — a single proceeding before the tree warden and the planning board.
• A pesticide license under MGL Chapter 132B Section 10 if you apply pesticides — the same provision a municipal tree warden must be licensed under.

What It Costs

Item	Cost	Notes
State arborist license	Does not exist	Massachusetts issues no general arborist license
Tree warden permit	Set locally	Required before a public shade tree is cut, trimmed or removed — the process, not the fee, is the cost
Pesticide license (c.132B §10)	See MDAR schedule	Required to apply pesticides; also what a tree warden in a town over 10,000 must hold
MCA / ISA certification	Voluntary	Professional credentials, not state licenses — but often what municipalities look for
Massachusetts LLC	$500	Certificate of organization — among the most expensive LLC filings in the country

Coming From Another State

Is there an arborist license to transfer into Massachusetts?

Massachusetts does not run a state arborist license you could transfer into. Your ISA Certified Arborist credential is issued by the International Society of Arboriculture rather than by any state, so it comes with you unchanged — and in Massachusetts, where so much of the work runs through municipal tree wardens and public shade tree rules, it is the credential clients and towns actually recognize.

The state credential that governs the chemical side of the work is pesticide applicator licensing through MDAR, and that is where the reciprocity question lives.

Pesticide licensing reciprocity, and the condition it turns on

Massachusetts addresses out-of-state applicators in its certification regulations at 333 CMR 10.00, Certification and Licensing of Pesticide Applicators. The structure is mutual: recognition of a certification, license or equivalent rating issued by another state’s pesticide control agency is tied to that agency extending similar privileges to persons certified or licensed in Massachusetts.

So the question to ask is not “does Massachusetts reciprocate?” but “does my state reciprocate with Massachusetts?” A one-way arrangement does not satisfy a mutual condition, and the answer depends on your specific home state rather than on any general rule.

Confirm it with MDAR before you rely on it. We were not able to retrieve the full regulation text directly, so treat the above as the shape of the rule rather than the procedure: the Pesticide Program administers examination, licensing and certification, and applications run through the EEA ePLACE Permitting Portal. Ask the Program whether your state and your category are covered, and what it will want in place of an examination.

What does not transfer, whatever your license says

The part of Massachusetts practice that most often surprises arborists moving in has nothing to do with licensing at all. As covered above, the tree by the curb is not the homeowner’s to give you — public shade trees sit under the tree warden, not the abutting owner, and no pesticide license or ISA certification changes who may authorise work on them.

That is the practical order of business for someone relocating: sort the pesticide credential through MDAR if you apply products, and separately learn how the town you are working in handles public shade trees. The second one causes more trouble than the first.

The Tree by the Curb Is Not the Homeowner’s to Give You

The commercially dangerous thing about Massachusetts is not the license you cannot find. It is the tree you are about to be asked to remove.

Chapter 87 Section 1 is deliberately broad: all trees within a public way or on the boundaries thereof shall be public shade trees. Read on the boundaries thereof carefully, because that is where the trouble lives. A mature maple standing at the front edge of a property, which the owner has mown around for twenty years and unhesitatingly calls theirs, may sit on the boundary of the public way — and if it does, it is a public shade tree and it is not theirs to give away.

What the law then requires is a process, not a fee. Public shade trees shall not be cut, trimmed or removed, in whole or in part, by any person other than the tree warden or his deputy without a written permit from the tree warden. Note in whole or in part — trimming counts, not just felling. Before a public shade tree comes down there must be a public hearing. The tree warden posts notice describing the size, type and location of the tree in at least two public places and on the tree itself, at least seven days before the hearing, and publishes notice in a local newspaper once in each of two successive weeks, the first no less than seven days before. Where Chapter 40 Section 15C also applies, the hearings are consolidated into a single proceeding before the tree warden and the planning board.

Put commercially: a public shade tree removal is a multi-week civic process with a notice nailed to the trunk. A homeowner who wants it gone next Tuesday cannot authorize that, and a contractor who takes the job on the homeowner’s word alone has cut down a public tree without a permit. Chapter 87 also lets a property owner injured by a tree warden’s decision about trimming, cutting, removal or retention recover damages from the town under Chapter 79 — which tells you how seriously the Commonwealth treats the question of who decides. Section 5 of the chapter provides exceptions, and those are worth reading before relying on any of this in a specific case.

The one state credential in the picture is the pesticide license. Massachusetts requires a tree warden in a city or town of more than 10,000 inhabitants to be qualified by training and experience in the field of arboriculture and licensed with the department of food and agriculture in accordance with Section 10 of Chapter 132B. That is the pesticide licensing provision — so the person with statutory authority over your town’s public trees holds a pesticide license, and if you apply pesticides commercially you will need one too.

Finally, budget for the entity. A Massachusetts LLC costs $500 to file, several times what most states charge and by a distance the largest formation fee in this family. It is a real number to plan around when you are working out what starting actually costs here.

How to Get Licensed, In Order

1. Stop searching for a state arborist license — Massachusetts has none to issue.
2. Before quoting any removal near a road, establish whether the tree is a public shade tree. Within the public way or on its boundaries is the test.
3. If it is, route the job through the tree warden and get the written permit. Never take the homeowner’s authority as sufficient.
4. Build the hearing timeline into your quote — seven days of posted notice, newspaper publication in two successive weeks, then the hearing itself.
5. Introduce yourself to the tree wardens in the towns you work. They hold the permit power and they are a referral source.
6. Take a Chapter 132B Section 10 pesticide license if you will apply pesticides for hire.
7. Consider Massachusetts Certified Arborist or ISA certification — voluntary, but it is the language municipalities speak.
8. Register the business entity, budgeting the $500 Massachusetts filing fee.

Staying Licensed

There is no state arborist license to renew in Massachusetts, so what you are maintaining is your relationship with the permit process and, if you spray, your Chapter 132B Section 10 pesticide license on MDAR’s renewal cycle. The public shade tree rules are not a one-off approval: every public shade tree job needs its own written permit from the tree warden, and trimming counts as much as removal because the statute reads in whole or in part. Tree wardens change with municipal appointments, and Chapter 87 Section 5 carries exceptions worth re-reading rather than remembering, so confirm the current position with the town rather than relying on how the last job went. Voluntary MCA or ISA certification carries its own continuing education if you hold it.

Frequently Asked Questions

Does Massachusetts require an arborist license?

There is no general state arborist license in Massachusetts. The credential the state does license is under the pesticide law — MGL Chapter 132B, Section 10 — and that is what a municipal tree warden in a city or town of more than 10,000 people must hold. Massachusetts Certified Arborist and ISA certification are professional credentials rather than state licenses.

Can I remove a tree on the street in Massachusetts?

Not on your own authority, and not on the homeowner’s either. Under MGL Chapter 87, public shade trees shall not be cut, trimmed or removed, in whole or in part, by any person other than the tree warden or a deputy, without a written permit from the tree warden. A public hearing is required first, with notice posted in at least two public places and on the tree itself at least seven days beforehand, plus newspaper publication once in each of two successive weeks.

What counts as a public shade tree in Massachusetts?

More than people expect. MGL Chapter 87 Section 1 provides that all trees within a public way or on the boundaries thereof shall be public shade trees. The boundary language is the catch — a tree standing at the edge of a front garden, which the homeowner assumes is theirs, can sit on the boundary of the public way and be protected.

What does a Massachusetts tree warden have to be qualified in?

In a city or town of more than 10,000 inhabitants, the tree warden shall be qualified by training and experience in the field of arboriculture and licensed with the department of food and agriculture in accordance with Section 10 of Chapter 132B — the state pesticide licensing provision.

Tree work sits alongside our full guide to starting a landscaping business in Massachusetts, and the wider guide to starting a business in Massachusetts.

Can you transfer an out-of-state pesticide license to Massachusetts for tree work?

Massachusetts has no state arborist license to transfer into, so the question concerns pesticide applicator licensing through MDAR. Its certification regulations at 333 CMR 10.00 address applicants holding a certification, license or equivalent rating from another state’s pesticide control agency, on a mutual basis tied to that agency extending similar privileges to Massachusetts licensees. Whether your state qualifies depends on your state, so confirm with the MDAR Pesticide Program before relying on it.

Sources

Source	What It Covers
MGL Chapter 87 Section 1 — public shade trees	That all trees within a public way or on the boundaries thereof shall be public shade trees
MGL Chapter 87 Section 3 — cutting public shade trees	The written permit requirement, the ban on cutting or trimming in whole or in part by anyone other than the tree warden, the public hearing, the posted and published notice periods, the consolidated hearing with Chapter 40 §15C, and damages under Chapter 79
MGL Chapter 41 Section 106 — tree wardens	That a tree warden in a city or town over 10,000 inhabitants must be qualified in arboriculture and licensed under Chapter 132B Section 10
Massachusetts Secretary of the Commonwealth — LLC information	The $500 certificate of organization filing fee
333 CMR 10.00 — Certification and Licensing of Pesticide Applicators	The Massachusetts regulation governing applicators certified or licensed by another state and the mutual-privileges condition
Massachusetts MDAR — Pesticide Examination and Licensing	The Pesticide Program that administers examination, licensing and certification, and the ePLACE application route