This is something that's actually starting to happen - for instance, in the San Francisco Bay Area, there are a hell of a lot of wineries thanks to a historically Mediterranean climate that favored growing grapes.
However, lately a lot of these wineries/grape farms have been popping up in central Oregon, since now it isn't snowing all that much there anymore.
Now for some /r/theydidthemath bullshittery-
The Earth has warmed about 1.25C so far, and the difference between Napa, CA and Eugene, OR is about 6 degrees.
So that's about 4.8 degrees north for every 1C of warming (ignoring topography/geography, elevation, actual weather patterns, and pretty much everything else lol).
At +4C, that allows an additional ~+19 degrees latitude for growing the same crop.
So I'd say that +4C temp rise could result in wineries popping up in Seattle, WA and Vancouver, BC.
Again, completely ignoring pretty much all of reality.