The federal WARN Act requires 60 days advance notice before most mass layoffs and plant closings — and many states have stronger versions. Here is what triggers WARN, what the notice has to include, and what you can recover if your employer skipped it.

The federal Worker Adjustment and Retraining Notification Act (WARN Act), administered by the U.S. Department of Labor, generally requires employers of a certain size to give workers 60 days of advance written notice before a "plant closing" or "mass layoff." Where an employer skipped notice — or shortened it without a valid exception — the statute generally provides affected workers up to 60 days of back pay and benefits. Whether and how much applies depends on your situation, and the rules and figures below can change.

WARN is one of the few federal worker-protection statutes with a clear, money-on-the-table remedy. It is also one of the most commonly violated, because the 60-day clock cuts against the way layoffs are usually planned. Understanding how WARN works lets many people check what they were generally owed and act before the deadlines close.

This is the federal floor. Several states — including California, New York, Illinois, and New Jersey — have stronger "mini-WARN" laws that generally lower the employer-size threshold, lengthen the notice period, or add severance on top. Where a state law is stronger, it typically controls — so your state may differ.

When does federal WARN apply?

The DOL explains that federal WARN generally applies to employers with 100 or more full-time employees, or 100 or more employees who together work at least 4,000 hours per week excluding overtime. Coverage is typically assessed at the corporate parent level rather than entity by entity, so separately incorporated subsidiaries can be aggregated where the parent runs them as a single operation — how that plays out depends on the specific corporate structure. Where an employer is covered, 60 days of advance written notice is generally required before either of two triggering events at a single site of employment: a plant closing or a mass layoff, each defined by its own headcount test over a 30-day period. Smaller employers are generally outside federal WARN entirely, though several states set lower thresholds of their own. Whether your employer was covered depends on the facts. The two triggering events:

Plant closing. A permanent or temporary shutdown of a single site (or one or more facilities or operating units within a site) that results in employment loss for 50 or more full-time employees during any 30-day period.
Mass layoff. An employment loss at a single site of either (a) 500 or more full-time employees, or (b) 50 to 499 full-time employees if they make up at least 33% of the active full-time workforce at that site, during any 30-day period.

Under the statute, "employment loss" generally includes terminations other than for cause, layoffs exceeding 6 months, and reductions in hours of more than 50% in each month of any 6-month period. Voluntary departures, retirements, and discharges for cause typically do not count.

The 30-day window can be aggregated. Where an employer staggers separations to stay under the threshold (for example, three rolling waves of 20 layoffs in 90 days), WARN's 90-day aggregation rule may still pull them into the count if the layoffs are reasonably viewed as part of a single course of action — though how a court treats this depends on the facts.

What must the notice include?

WARN notice generally has to be in writing, and the DOL says it must go to three sets of recipients: each affected worker or their union representative, the state's dislocated worker unit, and the chief elected official of the local government where the closing or layoff will occur. All three are named, not just the workers. Content matters as much as delivery. The notice is typically required to say whether the action is permanent or temporary, to give the expected date of the first separation together with a schedule for the separations that follow, to state whether bumping rights apply, and to name a company official with a phone number for additional information. A general announcement that headcount reductions are coming is not usually treated as notice, because it does not identify the specific action. Whether a particular notice met the requirement depends on the facts. What the notice typically has to state:

Whether the action is permanent or temporary
The expected date of the first separation and a schedule for subsequent separations
Whether bumping rights apply
The name and phone number of a company official to contact for additional information

A vague all-hands email saying "we expect headcount reductions" is generally not treated as WARN notice. The notice typically has to identify the specific layoff or closing.

What exceptions are recognized?

Three narrow exceptions generally let an employer shorten the 60-day notice period, and it is worth saying at the outset that none of them lets an employer skip notice altogether. The faltering-company exception covers an employer actively seeking capital or business that, if obtained, would let it avoid or postpone the closing, where the employer reasonably and in good faith believed advance notice would have precluded the financing; it is limited to plant closings and does not reach mass layoffs. The unforeseeable-business-circumstances exception covers a sudden, dramatic, and unexpected condition outside the employer's control. The natural-disaster exception covers a flood, earthquake, drought, storm, or similar event. Even where one applies, the employer generally still has to give as much notice as is practicable and to state the basis for the shortened notice. The three recognized exceptions:

Faltering company. An employer actively seeking capital or business that, if obtained, would let it avoid or postpone the closing, and that reasonably and in good faith believed advance notice would have precluded the financing. Limited to plant closings — not mass layoffs.
Unforeseeable business circumstances. A sudden, dramatic, and unexpected condition outside the employer's control (a major contract cancellation, a sudden government shutdown, the start of a strike at a major supplier). The pandemic-era cases are still being litigated; courts have been split.
Natural disaster. A flood, earthquake, drought, storm, or similar event.

Even where an exception applies, the statute generally still requires the employer to give as much notice as is practicable and to include a brief statement of the basis for the reduced notice. Courts typically treat "we needed to act quickly" alone as not qualifying.

What are you owed for a WARN violation?

Where an employer is found to have violated WARN, the statute generally provides back pay at your normal rate for each day of the violation, up to 60 days — or half the days you worked for that employer, whichever is less. Benefits come with it, including the cost of medical expenses that would have been covered under an employee benefit plan during the violation period, and prevailing plaintiffs can generally recover attorneys' fees. There is also a civil penalty of up to $500 per day for the violation period, though that one is paid to the local government rather than to affected workers. Two offsets commonly reduce the figure: employers can generally offset back pay by voluntary payments, meaning severance that was not legally required, and by any wages paid during the violation period. What you might actually recover depends on the specifics of your situation. What the statute generally provides:

Back pay at your normal rate for each day of violation, up to 60 days (or half the days you worked for that employer, whichever is less)
Benefits, including the cost of any medical expenses that would have been covered under an employee benefit plan during the violation period
Attorneys' fees for prevailing plaintiffs
A civil penalty (paid to the local government, not to you) of up to $500 per day for the violation period

Mass-layoff WARN cases are commonly litigated as class actions in federal court. Under the statute, employers can generally offset back-pay damages by any voluntary payments (severance not legally required) and by any wages paid during the violation period. What you might actually recover depends on the specifics of your situation.

Which states have mini-WARN laws?

Many states have their own WARN-style statutes that go further than the federal floor, and where a state law is stronger it typically controls. The ways they go further fall into a few patterns. Some lower the employer-size threshold, so companies too small for federal WARN are still covered — California and Illinois at 75 employees, New York, Hawaii and Wisconsin at 50, and Tennessee covering the 50-to-99 band specifically. Some lengthen the notice period, with New York and New Jersey each requiring 90 days rather than 60. Some lower the triggering headcounts, so a smaller layoff is covered than federal WARN would reach. And two go past notice entirely: New Jersey generally requires severance as a baseline, and Maine requires severance when an employer relocates. Which of these applies generally depends on the state where the closing or layoff occurs. These rules vary and continue to change, so your state may differ.

What does California's Cal-WARN Act require?

Cal-WARN generally reaches further than federal WARN on both coverage and exceptions, while keeping the same 60-day notice period. It applies to employers with 75 or more employees, excluding those who have worked fewer than six months in the last twelve, which brings in companies well below the federal 100-employee floor. The triggering events are a mass layoff of 50 or more employees in a 30-day period, a plant closing, or a relocation in which a single site moves 100 miles or more — the relocation trigger has no federal equivalent. The most significant difference is on exceptions: California rejected the federal unforeseeable-business-circumstances exception, leaving only a physical-calamity carve-out and a faltering-company carve-out for an employer actively seeking capital. In practice that means a Californian employer has fewer routes to a shortened notice period than a federal one does. These rules can change, and how they apply depends on your situation. The California specifics:

Threshold: 75 or more employees (excluding those who have worked fewer than 6 months in the last 12).
Trigger: mass layoff (50+ employees in 30 days), plant closing, or relocation (single site moving 100+ miles).
Notice: 60 days.
No "unforeseeable business circumstances" exception. California rejected the federal exception; only "physical calamity" and an actively-seeking-capital faltering-company carve-out apply.

What does the NY WARN Act require?

New York's WARN Act is more protective than the federal statute on both who is covered and how much warning is owed. It applies to employers with 50 or more full-time employees rather than the federal 100, so a good many mid-sized companies are covered in New York that would not be covered federally. The triggering events are a mass layoff of 25 or more employees where they make up 33% of the workforce, or 250 or more regardless of percentage; a plant closing affecting 25 or more employees; or a relocation of more than 50 miles. The notice period is 90 days, half again as long as the federal 60. Where an employer falls short, the statute generally provides back pay and benefits for the violation period plus a state civil penalty. These rules can change. The New York specifics:

Threshold: 50 or more full-time employees.
Trigger: mass layoff (25+ employees if they make up 33% of the workforce, or 250+ regardless), plant closing (25+ employees), or relocation (more than 50 miles).
Notice: 90 days (50% longer than federal).
Penalties: back pay and benefits for the violation period, plus a state civil penalty.

What does New Jersey's NJ WARN Act (Millville Dallas Airmotive Act, as amended) require?

New Jersey is unusual because its statute requires severance as a baseline rather than only notice. It applies to employers with 100 or more employees, counting full-time and part-time together after the 2023 amendments, which is a broader count than the federal full-time test even though the headline number matches. The triggers are a mass layoff of 50 or more employees in a 30-day period regardless of what share of the workforce that represents, a termination of operations, or a transfer of operations. The notice period is 90 days rather than the federal 60. The distinctive part is the money: the statute generally provides one week of pay per year of service, with an additional four weeks owed if notice was short. New Jersey is generally regarded as the only state requiring severance as a baseline for mass layoffs. The New Jersey specifics:

Threshold: 100 or more employees (full-time and part-time combined, after the 2023 amendments).
Trigger: mass layoff (50+ employees in 30 days, regardless of percentage), termination of operations, or transfer of operations.
Notice: 90 days.
Mandatory severance: the NJ statute generally provides 1 week of pay per year of service, with an additional 4 weeks owed if notice is short. New Jersey is generally regarded as the only state that requires severance as a baseline for mass layoffs, regardless of whether notice was given.

What does the IL WARN Act require?

Illinois sets lower coverage and trigger thresholds than the federal statute while keeping the same 60-day notice period. It applies to employers with 75 or more full-time employees, or 75 employees who together work at least 4,000 hours per week — the same two-part structure federal WARN uses, but at a smaller headcount than the federal 100. The triggering events are a mass layoff affecting 25 or more employees where they make up 33% of the workforce, or 250 or more employees regardless of percentage, and a plant closing affecting 25 or more employees in a 30-day period. Those counts sit well below the federal triggers of 50 and 500, so layoffs that federal WARN would not reach can still be covered in Illinois. Where the state statute is the stronger of the two, it is generally the one that controls. These rules can change, and your situation may differ. The Illinois specifics:

Threshold: 75 or more full-time employees, OR 75 employees who together work 4,000 hours per week.
Trigger: mass layoff (25+ employees if 33% of the workforce, or 250+ regardless) or plant closing (25+ employees in 30 days).
Notice: 60 days.

What does Maine's Severance Pay When Employer Relocates law require?

Maine does not have a notice statute at all, but it does have a severance law aimed at one specific situation: relocation. Where an employer of 100 or more at a single facility relocates operations more than 100 miles, the law generally requires one week of severance per year of service for each affected employee. That makes Maine different in kind from the other states here, because the obligation is not triggered by a failure to give notice and there is no 60- or 90-day clock to count against. It is also narrower in reach, since layoffs that are not relocations are generally not covered — an employer closing a site in place would fall back on the federal WARN floor rather than on the state severance law. These rules can change, and whether the law reaches your situation depends on the facts.

What does Hawaii's Dislocated Workers Act require?

Hawaii's Dislocated Workers Act covers employers with 50 or more employees, a lower threshold than the federal 100, and generally requires 60 days of notice before a closing, a partial closing, or a relocation. What makes it distinctive is how it handles short notice. Rather than leaving a shortened notice period to be argued about as a violation, the statute generally converts it into supplemental severance: the employer owes the difference between the wages actually paid during the shortened notice period and the wages that would have been paid across the full 60 days. The practical effect resembles federal WARN back pay — missed notice turns into money — but the mechanism sits in the statute itself rather than being left to a court. Where state law is stronger it typically controls, and these rules can change, so your situation may differ. The Hawaii specifics:

Threshold: 50 or more employees.
Notice: 60 days for closings, partial closings, or relocations.
Supplemental severance: if notice is shortened, the employer owes the difference between the wages paid during the shortened notice and the wages that would have been paid during the full 60 days.

What does Wisconsin's Business Closing and Mass Layoff Notification Law require?

Wisconsin's Business Closing and Mass Layoff Notification Law applies to employers with 50 or more employees, which brings in companies below the federal 100-employee floor, and generally requires 60 days of notice — the same period federal WARN sets. The triggering counts are lower than the federal ones: a business closing affecting 25 or more employees, or a mass layoff affecting 25% of the workforce or 25 employees, whichever number is greater, with a cap at 500 employees. The two-part mass-layoff test means a small site can be covered through the headcount route while a larger one is covered through the percentage route. Where the state law reaches an employer or an event that federal WARN does not, the state law is what applies. These rules continue to change, and whether they reach your situation depends on the facts. The Wisconsin specifics:

Threshold: 50 or more employees.
Trigger: business closing (25+ employees) or mass layoff (25% of the workforce or 25 employees, whichever is greater, with a 500-employee cap).
Notice: 60 days.

What does Tennessee's Plant Closings and Reductions in Operations law require?

Tennessee's law is written to fill the gap the federal WARN floor leaves. It applies to employers with 50 to 99 full-time employees — precisely the band that sits below the federal 100-employee threshold and would otherwise carry no notice obligation at all. The triggering event is a plant closing or a mass layoff affecting 50 or more employees within a three-month period, and the notice requirement is 60 days, modeled on federal WARN. Because coverage stops at 99 employees, an employer large enough for federal WARN is generally handled by the federal statute rather than by this one, so the two fit together rather than overlapping. That is a narrower design than the mini-WARN laws that layer stronger rules on top of federal coverage. These rules can change, and how they apply depends on your situation. The Tennessee specifics:

Threshold: 50 to 99 full-time employees (filling a gap the federal WARN floor leaves).
Trigger: plant closing or mass layoff affecting 50 or more employees within a 3-month period.
Notice: 60 days (modeled on federal WARN).

Roughly half of US states have no mini-WARN statute. In those states, federal WARN is generally the only notice floor and typically applies only where an employer has 100 or more employees.

What should you do if you think your employer violated WARN?

The first move people generally make is documentary rather than legal: saving every document about the layoff, including the WARN notice if there was one, the date it was issued, internal memos, the layoff date itself, and any communications about timing. From there the work is arithmetic. Counting calendar days rather than business days between the notice date and the last day of work shows whether the notice period was met, and anything short of the applicable period is what people treat as worth a closer look. The next question is whether the company crossed a threshold at all, since violations often hide in staggered layoffs structured to stay below the trigger. After that, many people consult an employment attorney, because these cases are frequently brought as class actions and the limitations period runs from the date of the violation. Filing for unemployment promptly is common too. The steps people commonly follow:

Many people save every document about the layoff — the WARN notice (if any), the date it was issued, internal memos, the layoff date itself, and any communications about timing.
A common step is to compare the dates. It often helps to count calendar days — not business days — between the notice date and your last day of work. Less than 60 (or 90 in NY/NJ; less than the applicable state period) is something many people treat as a red flag worth a closer look.
Some people check whether the company crossed a threshold. Looking at the total separations at your site across a rolling 30-day window can be informative — WARN violations often hide in staggered layoffs that the company structured to stay below the trigger.
Many people consult an employment attorney. WARN cases are frequently brought as class actions and are usually taken on contingency. The 2-year statute of limitations generally runs from the date of the violation, so timing can matter.
People often file for unemployment promptly. WARN recovery generally does not delay unemployment eligibility, so filing early tends to preserve benefits while a WARN claim plays out — though your state's unemployment rules may differ.

Where a layoff affected enough people, coordinated representation is already common. Other employees at your site are often seeing the same gap, and the plaintiff-side employment bar tends to move quickly on these.

Official sources

Because thresholds, notice periods, and figures can change, many people confirm the current rules at the source for their situation:

Legal Information Institute (Cornell Law) — 29 U.S. Code Chapter 23: Worker Adjustment and Retraining Notification (federal WARN Act)
California Employment Development Department — Worker Adjustment and Retraining Notification (Cal-WARN)
New York State Department of Labor — Worker Adjustment and Retraining Notification (NY WARN Act)

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WARN Act and Mass Layoffs: What 60-Day Notice Actually Requires