That's the thing about screened limestone paved trails (I'm in La Crosse, and ride regularly on a few of them). Once it cools off and snows, things are pretty much over until Spring. For some reason summer rain is not normally much of a problem, but the cold/snow combination seems to loosen the limestone "paving" up until warm weather comes around again. I suppose a nice long Indian summer might revive them for a bit, but I wouldn't count on it.
We're still in pretty good shape on the western side of Wisconsin. I'm hoping to get at least a few more rails-to-trails rides in before winter.