I've planted them before and most years include them in the garden, along with about 11 other types. I usually get them in by early May in walls of water and enjoy tomatoes by mid July.
Some years Idaho has early light frosts. Real early like late Aug. early Sept. With a sheet thrown over the plant, Stupice lasts better than other varieties. The seeds don't turn black as some do with a little night time drop in temperature! Love it.
These seeds came highly recommended from a grower in northern Indiana. I was tired of waiting till August for homegrown tomatoes and was assured these would be cold tolerant and early. Stupidest came through brilliantly by July 3 here in Wiscasset, Maine. The tomatoes were very red, sweet and all perfectly shaped. You won't be disappointed.
I love this tomato! It grows OK here in my cool pacific climate, produces smallish fruit that has an exceptionally sweet taste (for a tomato). And it's early!!