The best time to plant lettuce is early spring and again in late summer, when the air stays cool and the soil sits in a mild range. A good gardener watches two things instead of the calendar. They track the last frost date and push a soil thermometer into the bed to see what the ground reads. That is how they know when to plant lettuce for a strong start, not a fixed month.
Lettuce hates heat, so timing matters more than any single month on the calendar. The seed wakes up best when the soil reads around 60 to 65 degrees Fahrenheit (16 to 18 degrees Celsius). Warmer than that and germination drops off fast. Cooler than that and the seeds just sit and sulk in the wet ground. The thermometer tells you the truth that a date never can. A cheap probe pushed two inches into the bed gives you a reading in seconds. Check it in the morning for a few days, since a single warm afternoon can fool you into sowing too soon.
Your exact month depends on your climate and your frost dates. As a rule, sow your first crop about two to four weeks before the last spring frost. In many regions that lands in March or April. A warm southern garden may be ready in February. A cold northern one waits until May. The point is to count back from your own frost date, not to copy a month off someone else's plan. Lettuce seedlings shrug off a light frost, so you can start them while the nights are still chilly and the bed feels bare. That cool head start gives you tender leaves before summer heat ever shows up.
Late summer opens the second window for a fall crop. Sow again from late summer into early autumn as the worst heat fades and nights start to cool. These two windows give you spring and fall lettuce from the same bed, which is why this crop earns its space twice a year. Skip the deep summer months, since high heat makes the plants bolt and turn bitter before you get a clean harvest. Fall sown lettuce often tastes sweeter too, because cool nights pull sugar into the leaves. Many gardeners say the fall crop beats the spring one for flavor. So the second window is worth the effort, even at the tail end of a long season.
Sow a short row every two weeks inside each window instead of all at once. This staggered planting hands you fresh heads for many weeks rather than one big glut that all matures the same day.
Check your local last spring frost date and first fall frost date before you sow anything. A quick search for your zip code or region gives you both, and those two dates frame your whole season. Count forward and back from them, and the right planting month falls into place on its own. This one step saves you from a crop that bolts in heat or stalls in cold soil. Frost dates shift a little year to year, so treat them as a guide and let the soil reading make the final call. When both line up, you know the moment is right.
The trick that keeps a steady supply is succession sowing every two weeks within each window. A single big planting all matures at once, and you end up with more heads than you can eat in a week. Small, frequent sowings spread the harvest out so you cut fresh leaves over a long stretch. Pair that habit with cool soil and your own frost dates, and you will pick crisp lettuce in both spring and fall.
Read the full article: Lettuce Growing: A Complete Beginner Guide
