Do You Need an Arborist License in Wyoming?

Last updated: August 25, 2026

Wyoming issues no arborist license — no board, no exam, and no statewide contractor license either. What binds a tree business here is workers compensation: the statute lists services to buildings and dwellings — the industry group that contains landscaping and tree services — as extrahazardous employment, which means coverage must come from the state fund, arranged before work begins. Pesticide work adds a $25 applicator license with a twist: the ornamental category is split by pest type, so insects and disease are separate exams.

What Wyoming Actually Requires

• No arborist license — Wyoming issues none; ISA certification is voluntary; no background check attaches to tree work.
• No statewide contractor license — contractor licensing in Wyoming is municipal (Cheyenne and Casper each run their own boards), so confirm requirements with the city where you will work.
• ★ Workers compensation through the state fund if you have employees: W.S. 27-14-108 enumerates industry group 5617, services to buildings and dwellings — which contains landscaping and tree services — as extrahazardous employment.
• ★ Before work begins: for extrahazardous industries, coverage through the Department of Workforce Services is required before work begins in Wyoming — register at WYUI.wyo.gov, where one account covers both unemployment insurance and workers comp.
• A commercial applicator license — $25 — to use or supervise the use of pesticides on a for-hire basis: core exam plus at least one category at 70%, category exams within 90 days, up to 6 attempts per exam.
• ★ Categories split by pest type: 903A weed control, 903B insect control, 903C disease control — in lawns, greenhouses and trees. Spraying for insects and treating fungus are two exams.
• Renewal on a short-cycle clock: the license runs the balance of the issue year plus 24 months, expiring January 31 — renew via 24 hours of coursework, the January recertification school in Casper, or retesting.

What It Costs

Item	Cost	Notes
State arborist license	Does not exist	No fee, exam or background check for tree work
Statewide contractor license	Does not exist	Licensing is municipal — check the city where you will work
Workers compensation	State fund premium	Extrahazardous by statute — purchased through DWS, in place before work begins
Commercial applicator license	$25	Core + category exams at 70%; expires January 31 after the balance of the issue year plus 24 months
Reciprocal applicator license	$25	Letter from the state where you tested + license copy + certificate of liability insurance; not open to Wyoming residents
General liability insurance	Not a state licensing condition	Required in the reciprocal packet; otherwise your decision — the state fund covers your crew, not the customer’s roof
Wyoming LLC	$100	Articles of organization; annual report license tax from $60

Tree Work Is Extrahazardous by Statute — and One Ornamental Category Is Really Three

Wyoming regulates tree work through exactly two systems, and both are structured differently from the states around it.

Workers compensation first, because it is the one with no alternative. Wyoming runs a state workers compensation fund, and W.S. 27-14-108 decides who must use it by enumerating NAICS codes as extrahazardous employment. The list includes industry group 5617, services to buildings and dwellings — and that is the NAICS group containing landscaping services, the classification that covers tree and shrub maintenance. The consequence is concrete: a tree service with employees must purchase coverage through the Department of Workforce Services’ Workers’ Compensation Division, and for extrahazardous industries that coverage is required before work begins in Wyoming — not once payroll settles, before the first cut. Wyoming joins North Dakota, Ohio and Washington in the monopolistic model. The statute does allow optional coverage elections, but only for industries not on the enumerated list — tree work is on it, so the option is not yours.

Registration is more consolidated than most states: you create one employer account at WYUI.wyo.gov and it covers both unemployment insurance and workers compensation filings. And note what the fund does not do: it covers your crew, not the customer’s property. The limb through the neighbor’s windshield is a general liability claim, and Wyoming attaches no GL condition to any state credential a tree service holds — that purchase is on you.

The pesticide license is cheap, and the category structure is the trap worth knowing. The commercial applicator license is $25, for anyone using or supervising pesticides on a for-hire basis: pass the core exam plus at least one category at 70%, finish your category exams within 90 days, with up to 6 attempts per exam. Most states put everything a tree crew sprays into one ornamental category. Wyoming splits category 903, Ornamental & Turf, by pest type: 903A is weed control, 903B is insect control, 903C is disease control — each in lawns, greenhouses and trees, each with its own exam. A crew that injects for bark beetles and also treats a fungal canker needs 903B and 903C both. Plan the exams around the services you will actually sell rather than assuming one ornamental ticket covers the truck.

The license clock is also unusual: a commercial license is valid for the balance of the year in which it was obtained plus 24 months, expiring January 31 — so a license bought in March runs longer than one bought in November, and everyone’s expiry lands on the same date. Renew with 24 hours of pesticide-related coursework, by attending the January recertification school in Casper, or by retesting.

Coming from another state? Wyoming issues reciprocal commercial licenses, with three conditions worth reading twice: the verification letter must come from the state in which you completed testing (no chaining a reciprocal license into another reciprocal license), your home state must reciprocate for Wyoming licenses, and Wyoming residents cannot use the route at all — move here and you test here. The packet takes a legible copy of your current license, a certificate of liability insurance, and $25. That certificate is worth noticing: the reciprocal packet is the one place Wyoming’s applicator licensing asks for proof of insurance.

How to Get Licensed, In Order

1. Stop looking for an arborist license — Wyoming issues none, and contractor licensing is municipal, so ask the city where you will work.
2. Register at WYUI.wyo.gov before you hire anyone — tree services are extrahazardous by statute, and state-fund coverage must be in place before work begins.
3. Map the pesticide categories to your services: 903A for weeds, 903B for insects, 903C for disease — each is its own exam.
4. Pass the core exam plus your categories at 70%, finishing category exams within 90 days.
5. Pay the $25 license fee — or use the reciprocal route with a letter from the state where you tested, your license copy, and a certificate of liability insurance.
6. Buy general liability on the merits — the state fund covers your crew, not the customer’s property.
7. Register the business entity — $100 for articles of organization, with the annual report license tax from $60.

Staying Licensed

Two clocks run in Wyoming. The applicator license expires January 31 after the balance of its issue year plus 24 months — renew with 24 hours of coursework, the January recertification school in Casper, or a retest, and remember each pest-type category renews with the license, so keep records for every subcategory you hold. The workers comp account with DWS runs continuously against payroll: premiums follow your classification and wages, every new hire must be covered before beginning work, and because coverage for an extrahazardous industry can only come from the state fund, a lapsed account has no private fallback. The annual report license tax (from $60) keeps the entity itself alive. And if you picked up your license reciprocally, it rests on the home-state license staying in good standing — keep that one current too.

Frequently Asked Questions

Does Wyoming require an arborist license?

No. Wyoming issues no arborist license and has no arborist board, so pruning and removing trees needs no state credential, exam or background check. ISA certification is voluntary. There is no statewide contractor license for tree work either — contractor licensing in Wyoming is municipal, so check with the city where you will work. What the state does regulate is workers compensation and pesticide application.

Can a Wyoming tree service buy workers comp from a private insurer?

No. W.S. 27-14-108 enumerates the industries that count as extrahazardous employment, and the list includes industry group 5617, services to buildings and dwellings — the NAICS group that contains landscaping services, which covers tree and shrub maintenance. Extrahazardous employers must purchase coverage through the Department of Workforce Services’ Workers’ Compensation Division, and coverage is required before work begins in Wyoming. Optional coverage exists only for industries not on the statutory list.

What pesticide license does a Wyoming tree service need?

A commercial applicator license from the Wyoming Department of Agriculture — $25 — for anyone using or supervising pesticides on a for-hire basis. You pass the core exam plus at least one category exam at 70%, with category exams completed within 90 days. The license is valid for the balance of the year in which it was obtained plus 24 months and expires on January 31; renew with 24 hours of coursework, the January recertification school in Casper, or by retesting.

Which Wyoming pesticide category covers tree work?

Category 903, Ornamental & Turf — but Wyoming splits it by pest type rather than by site: 903A covers weed control, 903B insect control, and 903C disease control in lawns, greenhouses and trees. A tree service that sprays for bark beetles and treats a fungal blight needs both 903B and 903C, each with its own exam. Category 902 Forest Pest Control exists but is aimed mostly at Forest Service bark-beetle work.

Tree work sits alongside our full guide to starting a landscaping business in Wyoming, and the wider guide to starting a business in Wyoming. Or see how every state handles tree work in our arborist license requirements by state guide.

Sources

Source	What It Covers
Wyo. Stat. 27-14-108 — extrahazardous industries (Title 27 PDF)	The enumeration of industry group 5617, services to buildings and dwellings, as extrahazardous employment, and the optional-coverage provision limited to non-enumerated industries
Wyoming DWS — workers compensation for employers	That coverage through DWS is required before work begins for extra-hazardous industries, that coverage is determined by NAICS classification, and the WYUI.wyo.gov employer account covering both UI and workers comp
Wyoming Department of Agriculture — applicator licensing	The commercial license term of the balance of the issue year plus 24 months expiring January 31, the renewal routes including the January recertification school in Casper, and the reciprocal license requirements: verification letter from the state where testing was completed, license copy, certificate of liability insurance, $25 fee, and the bar on Wyoming residents
University of Wyoming PSEP — new commercial applicators	The $25 license fee, the core plus category exam requirement at 70% with category exams within 90 days and up to 6 attempts, and renewal by 24 CECs or retesting
University of Wyoming PSEP — categories and study materials	The 903 Ornamental & Turf subcategories split by pest type: 903A weed control, 903B insect control, 903C disease control, plus 902 Forest and 906 Right-of-Way
Wyoming Secretary of State — LLC articles of organization	The $100 filing fee for articles of organization