Remove the salt cell and store it inside.

Yes. That’s the main difference from a regular pool. The salt cell is expensive and fragile, and if water freezes inside it, the cell cracks and you’re out a few hundred bucks.

Here’s the quick version:
Clean the cell first (vinegar or a mild acid solution) so mineral buildup doesn’t harden over winter. Then disconnect it from the plumbing and store it somewhere dry and above freezing — garage, basement, shed. Wrap it in a towel or bubble wrap if you’re worried about bumps. The rest of the pool winterization is the same as any other pool: lower the water level, blow out the lines, add winterizing chemicals, cover it.

If your system has a flow switch or any other component that could trap water, remove those too. And double-check your manual — some cells are meant to be stored in a bucket of water, but most are fine dry. When in doubt, dry is safer than leaving it in the line.

Your salt cell is the most expensive single part of that pool. Don’t gamble it on a freezing night.