If you don’t know when the last expected spring frost is in your area, look it up online. For example, you could search “average last spring freeze dates for Kansas City. "
Don’t leave the lettuce out at night until they have completely acclimated to the outdoors. This will typically be at the end of the process. It’s OK if the weather hasn’t completely warmed at this point. Properly acclimating the lettuce will help it develop a resistance to cooler temperatures. You should not plant the lettuce outside, however, until you are certain that there will not be another frost. [8] X Research source
Plant the lettuce in a part of your garden with rich, well-drained soil that has full sun exposure. [10] X Research source
Never water the lettuce more often than this or it might develop rot. You may also want to avoid watering in the evening.
Don’t wait too long to harvest your lettuce or it could develop a bitter taste. Lettuce doesn’t thrive in hot temperatures. You should make sure to harvest the lettuce before temperatures rise above 80 °F (27 °C).
