That's about a 4 degree offset -- that is probably the limit of a cold frame? You could do seedlings inside in windows, maybe?
I'm currently reading "Animal Vegetable Miracle" by Barbara Kingsolver, which is all about these issues. Are there gardeners in your area who can help with what varieties of what work better? Some varieties are fine with the cold, while others can go late into the end of the season. Is there a farmer's market near you?
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