IN THIS GUIDE · A Central Frontenac forester's TN file is decided by two documents: the degree or licence, and the letter that describes the work
Start with the TN eligibility and application overview
Which credential the letter should rely on
The forester in this example holds a Bachelor of Science in Forestry and is a Registered Professional Forester in Ontario. Either satisfies the listed rule, but the letter should name one and attach it, not describe both loosely. Where an applicant holds only the provincial registration and a diploma rather than a degree, the registration alone carries the rule. Any state forester licensing in Maine is a separate practice matter for the employer to plan; it is not the immigration test, and an officer will not treat a pending state licence as a defect if the Ontario credential is in hand.
What the employer letter must actually say
The letter should state the profession by its listed name, describe duties that are forestry duties, such as inventory, harvest planning, regeneration assessment and compliance with state forest-practice rules, and give the location, remuneration and intended length of stay. It should name the employer and confirm that the forester will be its employee. A letter that describes a woods boss supervising cutting crews, with forestry planning mentioned as an afterthought, invites the question whether the job is really professional. Ask the employer to write the duties as they will be performed and then check them against the profession, rather than writing to the profession and hoping the job matches.
Fieldwork, seasons and re-entry
Forestry work follows seasons, and a Central Frontenac applicant may expect to return to Ontario for extended periods between field seasons. TN admission is for the period the employer requests, up to three years at a time, and returning home does not end it, but the applicant should carry the original letter and credentials on every re-entry because an officer may ask again. If the employer later adds a second work site or a different employer wants the applicant part time, that is a new TN, not an extension of the old one. Keep a single file with the current letter on top.
The self-employment line for consulting foresters
Many Ontario foresters work through their own consulting corporations. TN does not permit self-employment in the United States, and a Canadian corporation invoicing the Maine company for its owner's services is not a cure. If the forester owns the company that supplies his labour, or holds a controlling stake in the U.S. entity receiving it, the arrangement is prohibited. The safe structure is a direct employment relationship with the U.S. employer, with the Ontario consulting company either dormant or serving only Canadian clients while the applicant is not physically in the United States.
Sources reviewed 2026-09-07. This guide covers a preparation focus; it is not an individual eligibility assessment.