When it's time for frost to hit and we still have veggies that are still producing, we drape sheets or blankets over the veggies before dark. Then when we get up in the morning before the sun is fully out, we take the sheets or blankets off, so as to not bruise the veggies or give them black spot, especially on the tomatoes.
You can also rinse the frost off with water hose before the sun comes up, it works. I've done this for many years but when a hard freeze comes that's the end for the veggies. Then it's time to plant all kind of greens, onions, garlic & lettuce, good luck.
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