The Zielona Góra area (part of Germany before WW2) was the only commercial grape-growing reigon in post-war Poland (but rather modest). In recent years there has been some talk that climate warming may make it possible to also resume grape production in the SE (former Austrian-ruled Galicja). Anyone heard anything about this? I understand many Poles grow smallish, sour grapes in back gardens and allotments and use them for
it is possible to grow vineyards as far north as Estonia - and you wouldn't call the grapes I have against the wall sour
vineyards were quite common in southern Poland in the climatic optimum before the little ice epoch that started somewhere in the middle of the XIIth century (the vines must have been brought in by monks)
Close to where I used to live in NL, there is a vineyard of a decent size which actually started to produce wine on a moderate scale a few years back. I sampled some of it and it wasn't even bad. And if that is pssbl in NL, which is on the same equation as PL, then it most definitively should be pssbl over there, given the fact that you can plant them there on the southside of mountains, a phenomenae we don't even have and it still grows.
there are some wine growing enthusiast in Suwałki area - there has been a way of protecting grapevines from frost by burrying them in soil developed quite long time ago in what is now Moldova I presume - and yes there are vineyards in Estonia - of course they are not commercial in the strict sense
I have been in Zielona Gora. My gf's sister lives right near where the grapes are grown. I can't say there were enough to make a lot of wine. The wine museam was interesting though.