What it is
Open enrollment sets the dates when health, dental, vision, FSA, and 401(k) elections can be changed. Elections lock for the year, and changes outside the window need a qualifying life event. Separation is not a qualifying event for the FSA, and the plan year boundary decides the balance.
What to do about it: Take the election snapshot before your last day: elections, plan year start, and the FSA balance. A plan year that starts inside your notice window changes what you can do.
Plain-language description of US practice, not legal, tax, or financial advice. The paired guide carries the citations, dates, and thresholds; the state pages carry the local windows.