The Q&A Archives: Optimum Night-time Temperature for Planting Seeds.

Question: What is the ideal night-time temperature that needs to be reached before planting a vegetable garden?

Answer: You can plant cool-season crops, such as lettuce, spinach, radishes, and peas, even before the last frost date, so they can survive night temperatures into the 30s. Warm-season crops, such as tomatoes, eggplant, beans, and beets, prefer night temperatures to be closer to 55- 60 degrees F. You can plant warm-season crops earlier and cover them with a row cover to keep the surrounding air warmer during the night, but you shouldn't need to go to this trouble because your growing season is quite long already. Good luck.

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