Hi Jason, we dont really stop diving, it just slows down quite a bit in the winter. Sadly for us, there aren't many good shore dive spots in our area. I go to St Catherines sometimes, or to the Waterford Ponds, but there isn't a lot to see in there. My dive shop (Scuba Plus in Simcoe) does an annual ice dive in the Waterford Ponds if that is something you are interested in. Otherwise, we try to get our charter boat in the water by April, and get the wrecks marked with buoys for the season.
If you are ever looking for a dive buddy in the area, let me know, and I hope you'll be out on Scuba Plus' charter boat in Lake Erie this summer. We've got tons of wrecks to dive.
Cheers,
Jim