http://michiganhopalliance.com/ seems to be able to grow a few varieties. They're a little south of you but not that much. You might need to look into local history to get a better idea. Maybe a previous owner was a homebrewer? Maybe your wife's co-worker has the hots for you and there are no hops!
But it would be pretty near impossible to tell what kind they are in April-May before they even start growing again. Hell, unless she knows exactly where they are, they might even be difficult to find. (I don't know what the local foliage is like).
My brother in law found some pretty deep in the woods in northeast PA growing amongst a bunch of thorny vines and under a pretty full canopy. It took us about 45 minutes to actually find it again. Luckily it was later in the season so the cones were formed.
Anyway, I'm blabbering, time to get to bed.