For me in 7a these seem to be early-to-mid season varieties that reliably produce: Florea (the earliest for me), Improved Celeste, Ronde de Bordeaux, Bari, Violette de Bordeaux, Mt. Etna types, Malta Black, Atreano. These should all produce in ground in zone 7a even after freezing to the ground with the possible exception of Atreano. I'm tempted to add Adriatic JH to the list but it seems to ripen mid-to-late season. San Pedro types (Desert King, Filacciano Bianco, etc) would need to only be grown in containers unless we go back to having mild winters!