For hundreds of years, the people of, say, Hartford, Connecticut only ate fresh vegetables in the summer and fall. There is no reason, given Hartford’s climate, that you could have a green salad in February. Other than that, they ate root vegetables and dried fruit in the winter and spring. That was true until about 1950 or so.
There are some food that are hard for cold to kill like collards, kale, Brussel sprouts, etc.