They can be a legitimate scheduling factor to discuss, but the underlying eligibility, evidence, and process still need to be confirmed on their own timeline rather than being rushed to fit a planting or harvest schedule.
Keep the farm calendar and the immigration timeline visible together
Identify any date by which farm responsibilities need to be handed off or covered, and compare it honestly to how long the TN preparation and process are actually expected to take. A seasonal deadline is a real planning constraint, but it is not authorization to work and should not be used to skip confirming the underlying documentation.
Sequence preparation from the employer's genuine start need backward: confirm citizenship, classify the occupation, test its minimum credential, obtain the letter or contract, and only then choose travel or Form I-129. A harvest date cannot authorize U.S. work or excuse an incomplete record. The frequent mistake is booking a handoff and travel before the employer has finalized duties, leaving the applicant to reconcile a changed job at the last moment. Because TN requires prearranged professional activity and bars self-employment, verify that any preliminary calls or site visits do not become productive services before admission or other authorization.
Hypothetical example: An agriculturist near Strathroy-Caradoc expects to finish a grain harvest before beginning crop-consulting duties for a U.S. seed company. The employer initially advances the start date but has not completed its support letter. She keeps the farm coverage plan flexible, obtains the final description, and selects the appropriate Canadian procedure before travelling. If harvest runs late, she renegotiates the employment date instead of assuming a seasonal obligation changes TN documentation or permission.