|Some pooh-pooh companion gardening,|
but I believe it works, since opposites tend to team up.
Spinach and peas can be planted at the same time, very early. I have heard of peas planted in late fall. I planted the spinach crop in late fall and expect to see it really growing in March, perhaps in February if we keep getting warm weather.
Frost experience is key to a gardener's understanding. The first to die from a frost are the egg plants and tomatoes, both nightshades. Pumpkins cease their efforts at world domination from the first heavy frost.
Those frost-killed items are plants we save for later efforts in the season..
The plants that love cold and thrive in it are going to be relatively bug free if planted before the last frost. This year I am pushing the frost limits as much as possible, since early planting will be greatly rewarded later. I can get several crops fruiting in succession and get more growth from long-term heavy feeders like pumpkins and gourds.