^IF it was a foreclosure, you may want to check to see if the service company closed it prior to sale. Under Freddi Mac and Fanny Mae policy, the property managers have a budget to do so. In that case, you should winter-over just fine.
However, if it was a homeowner and just left vacant, it may never have been closed properly. I'm at roughly your latitude, and last year was a very forgiving non-freeze season (in Michigan). But it might be worth a check - either by a pool company (ask them to see if the equipment was drained or check yourself to see if drain plug is out of the filter) and to see if your skimmer has been winterized.
Come talk to me next spring -- I rehabbed one of these

-- and don't be tooooo surprised if you discover that even though there's a cover on it, it was clearly left open and is FULL of debris...and that the real estate co just put that cover back on (that's what happened in my case.)
But no worries - you can clear it. Start early - eg. April, before warmth is against you in terms of outpacing algae! Best wishes.
PS Is it a safety cover - and if so, is it solid or mesh, or a combo of both with the mesh center square?
If it has a mesh square, or is mesh, be careful when you pump it that you don't just bring the water level down too low. In winter, with snow accumulation, the cover needs the weight of the water to sit upon.