As long as there is no ice on roads, I'm good. I would say Southern North Carolina, South Carolina or Tennessee. Would still need some cold weather gear, but could ride about anytime if dressed properly. Of course, if you want to ride in warm weather, would need to move to Southern California, South Texas, or Florida.
I know it's different coasts but the California central valley never has to be put away. Sure there are days of rain but there's not a month you can't get out and ride at least a few days.
Not perfect every day, but how far south would I have to move from Ontario, to be in a climate where I can expect to never put the bike away for the winter?
Some guys rode all winter last year in the Okanagan. Same in Lower Mainland. Looking at the highway cams in Kelowna it doesn't look like riding weather today though.