I have observed that some crops seem to withstand colder weathers than others. For example, squash dies at around 25f while cabbage dies at 32f. Which crop can withstand the coldest weather?
Pumpkins are the most resilient plant in the game. Though I have some uncertainties in my answer, just from reading the comments on the Wiki, and several other resources, I do believe that pumpkins are the most resilient plant.