Answer: Tomatoes are warm-season crops that will grow and produce as long as the weather stays warm. When nighttime temperatures drop below 50F, the plants will stop developing flowers and maturity of existing fruit will be retarded. You can try to extend the season for your tomato plants by protecting them with wire cages covered with clear plastic. If temperatures look like they're going to stay cold, you might be able to ripen the tomatoes your plant has already developed by either picking them and taking them indoors, or by pulling the entire plant out of the ground, roots and all, and hanging it upside down in a garage or shed.
Even in your southern California garden, the summer season eventually ends!
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