Answer: I think you're pushing the tomato growing season by planting so soon. Tomatoes like warm soil and air temperatures to grow and are frost sensitive. You might want to cover the plants with a floating row cover (AKA Reemay) to get them through the cool nights until May when the days and nights stay warmer. Your last expected frost date is early May, but as long as you don't have frost, they probably will be okay. Just don't expect a lot from them until it gets warm.
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