"It depends on what you planted and how cold your temperatures have been. Some vegetables, such as lettuce, peas, spinach, kale, cauliflower and carrots, prefer cooler spring and fall temperatures. But tomatoes, peppers, squash and other summer vegetables will wither in the cold.
Regarding the soil, if the drainage is good and there is room for roots to spread (no impediments such as rocks), then you should be able to grow vegetables there. But I would always advise amending the soil with compost and composted cow manure for best results.
Luke Miller, editor
Garden Ideas & Outdoor Living magazine