Hardy vegetables (and flowers) can easily withstand -10°C once established for a few days with the protection of cloudy nights.
So for an early crop and a bug free harvest, one should plant all the cool crops, cauliflower, broccoli, various lettuces, beets, swiss chard, chives, onions, spinach, and a variety of peas, as well as parsley and cilantro. For the seeded crops it might still be a bit too cold in the soil for good germination, so perhaps try just a sampling of radishes, spinach, chards, beets, carrots, peas, and lettuce, especially in a protected warmer area by your house.
Drop by and check out our wide selection of hardy vegetables, including:
Click here to check out our selection of assorted hardy lettuce.