Short answer: not automatically. Ontario employment law has no blanket "you can fire anyone in the first 3 months" rule. Whether it is safe depends on three things: the Employment Standards Act (ESA) notice threshold, whether a valid termination clause limits common-law notice, and whether the attendance issue is tied to a protected ground such as illness or disability under the Human Rights Code. Skip any one of these and a "simple" probation firing can become a costly claim.
Does "probation" even exist under Ontario law?
Ontario's ESA does not define "probation." Employers use it by contract, but the law only cares about your actual start date and what your contract says. Under the ESA, an employee must be continuously employed for three months before statutory termination notice (or pay in lieu) is owed. Below three months, the ESA generally requires no notice. That three-month rule is where the "probation is safe" myth comes from, but the ESA minimum is only one layer.
The three things that decide whether it's safe
1. ESA minimum notice
If the employee has less than three months of continuous service, you generally owe no statutory notice or termination pay. At three months or more, you owe the ESA minimum, which scales with length of service:
| Period of employment | Statutory notice |
|---|---|
| Less than 1 year (3 months+) | 1 week |
| 1 year to less than 3 years | 2 weeks |
| 3 years to less than 4 years | 3 weeks |
| 4 years to less than 5 years | 4 weeks |
| 5 years to less than 6 years | 5 weeks |
| 6 years to less than 7 years | 6 weeks |
| 7 years to less than 8 years | 7 weeks |
| 8 years or more | 8 weeks (maximum) |
(A mass termination, meaning 50 or more employees within a four-week period, triggers a separate and longer notice regime of 8, 12, or 16 weeks.)
2. Common-law reasonable notice
This is the trap. Even a short-service employee can be owed common-law reasonable notice, often far more than the ESA minimum, unless the employment contract contains a clear, enforceable termination clause that limits entitlements to the ESA minimum. Ontario courts routinely strike down poorly drafted clauses, which reinstates full common-law notice. A valid, up-to-date termination clause is your single most important protection.
3. Human Rights Code, the attendance red flag
Attendance problems are frequently linked to illness, disability, family status, or another protected ground. Terminating for attendance that stems from a protected ground, without first meeting your duty to accommodate to the point of undue hardship, can expose you to a human-rights complaint, regardless of probation status. Before acting, confirm the cause of the absences, not just the count.
Before you terminate: a 5-point check
- Read the termination clause in the signed contract. Is it ESA-compliant and enforceable?
- Confirm the cause of the attendance issues. Any medical or protected-ground link triggers the duty to accommodate.
- Check length of service against the ESA three-month threshold, and past it, the notice band in the table above.
- Ensure you have documentation: dated records, prior conversations, and any attendance policy the employee was given.
- Calculate exposure: the ESA minimum plus potential common-law notice if the clause fails.
Bottom line
"Probationary" is not a legal free pass in Ontario. If the contract's termination clause is valid and the absences have no protected-ground link, a short-service termination can be low-risk. If either is uncertain, the exposure is real, and it is worth a verified check before you act.
FAQ
Is there a 3-month probation period in Ontario?
Not in the ESA itself. "Probation" is a contract term. The ESA sets a three-month continuous-employment threshold below which statutory termination notice generally is not owed, which is different from a legal "probation" status.
Can I fire during probation without notice?
Only if the employee has less than three months of service and a valid termination clause limits common-law notice. Otherwise you may owe reasonable notice.
What if the absences are due to illness?
Illness and disability are protected grounds. You must accommodate to the point of undue hardship before termination, or risk a Human Rights Code complaint.
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Informational only; not legal advice, and no lawyer-client relationship is created. Figures verified against the Ontario.ca ESA guide (Termination of Employment) as of August 13, 2026. Confirm against current Ontario ESA and Human Rights Code sources before acting.