it depends on how much you have left?
A minute amount or a lot.

If it's in bags, it can be stored in a dry place. I would make sure there are a few small holes in the bags to let it breathe so it doesn't get moldy or start decomposing.

You might even store it outside under a tarp, but keep in mind most plastic product bags will start to break down and tear easily after a few months. Keeping the sun off will help.

If it's bulk, you can make a pile and keep it dry with a tarp, etc.

Keep it dry, and it will keep well.