Published October 27, 2026.
Define the seasonal cohort
A seasonal cohort is every employee hired for the defined peak period, including temporary staff supplied by an agency. Record the start date, expected end date, role, shift, location, and source channel. Without a cohort definition, seasonal attrition disappears into the general turnover number.
Decide in advance whether the cohort includes rehires and employees who move from seasonal to permanent during the period. Keep the groups separate in the analysis even if they share a training class. Mixing them makes it impossible to tell whether retention improved or the mix changed.
Pick five early-warning signals
Choose signals the operation can observe weekly: missed shifts in the first two weeks, schedule changes with short notice, incomplete training modules, unresolved access or equipment tickets, and one-on-one check-ins not completed. Each signal needs a definition and a data source.
Five is enough. A watchlist with twenty indicators gets updated once and then ignored. Assign a threshold to each signal, such as two missed shifts in the first ten days, and a named person who reviews the threshold breach.
Set thresholds and owners
Write the threshold as a rule, not a judgment: for example, any new hire with two unexcused absences in the first ten days is contacted by the onboarding lead within one business day. The contact is a conversation about barriers, not a disciplinary step.
Name a backup for each owner. Seasonal peaks coincide with vacations and shift changes, which is exactly when the watchlist loses its owner. The backup should have access to the same record and the same authority to route a fix.
Run a weekly 20-minute review
Meet once a week with the onboarding lead, the scheduling lead, and one operations manager. Review only the employees who crossed a threshold, the action taken, and the next date. Do not review the entire cohort in the meeting; use a report for the aggregate view.
Keep the meeting short and decision-oriented. If an item needs a policy exception, route it to the accountable owner and record the date. The review is a triage forum, not a performance discussion about individual seasonal workers.
Separate scheduling friction from performance
A missed shift may reflect unreliable transportation, a conflicting second job, or a schedule posted after the employee arranged childcare. Ask before coding it as an attendance problem. The fix may be a shift adjustment rather than a disciplinary conversation.
Record the reason in a small set of categories: transportation, childcare, second job, illness, miscommunication, or unknown. The distribution tells the operation what to change for the next peak. Unknown is a valid category and should not be forced into a cause.
Convert strong seasonal workers deliberately
Identify conversion candidates using the same evidence as any other hire: attendance reliability, task performance, safety behavior, and fit with the permanent role. Do not convert simply because someone finished the season.
Tell candidates the decision date and the remaining steps. A seasonal worker who hears nothing after the peak becomes a former employee with a poor impression. Even a clear no, delivered with a reason and a reapplication route, protects the employer brand.
Close the season with a retention readout
At the end of the peak, report the cohort size, the number who completed, the number who left early with reasons, the conversion rate, and the cost per completer. Compare with the prior season using the same definitions.
Add three lessons for the next ramp: one scheduling change, one onboarding change, and one communication change. Assign owners and dates before the team disperses. The readout is useful only if it changes the next season's plan.