Vladimir,
I can comment on Oregon Spring, growing it for the first time this year and this is only from my limited experience..
Cold tolerance -- Very good
Earliness -- I don't think it will be very early, it's listed as 70-75 days from one of the local seed suppliers. I have some fruits set but I think other varieties will come in earlier
Size -- My plant is at about 3ft already and it seems to have more of a compact indeterminate habit. It will likely get to 4-5 feet..
The earliest tomato that I've grown is definitely Gold Nugget, it's a cherry though.. I usually expect to get ripe fruit in June from that plant, which is pretty good for out cool spring climate.
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