Some things like peas dont care so much. My grandfather used to try to get the peas in a little earlier than most. Every year the kids would worry that the snow would wipe them out but grandpa insist that a layer of snow after planting was as good as a layer of manure and during those years where there was a final snow storm over the planting they had better yields.
I planted snow peas today. A little late, but January and February were unusually cold.