How to Grow Lettuce

Updated August 2026 · Garden Advice Guide

Sow lettuce in cool soil between 45 and 70F, keep it consistently moist, and harvest before the weather turns hot, because everything that goes wrong with lettuce is really the plant bolting. Give it 4 to 6 hours of sun in spring and fall, afternoon shade in summer, and sow a new short row every 2 weeks rather than one big planting. In most of the country, fall lettuce beats spring lettuce, because the season is moving toward cool weather instead of away from it.

Lettuce doesn't die of heat. It survives, sends up a flower stalk, and turns bitter and unusable. That's bolting, and avoiding it is the whole skill.

Not sure of your window? Find your sowing dates with our free When-to-Plant Lookup before you open a seed packet.

When to Plant Lettuce by Zone

Lettuce germinates best at 60 to 68F soil and actually stops germinating above about 80F, a dormancy response called thermoinhibition. That single fact shapes the whole calendar.

In zones 9 and 10 the pattern flips entirely: lettuce is a winter crop and summer is the dead season.

Read these dates as regional averages, not promises. Frost tables and USDA zone maps come from 30-year weather station averages spread over a wide area, and your own yard can run 1 to 2 weeks off in either direction. Elevation moves it the most, so a garden at 800 feet and one at 2,200 feet in the same county are not on the same calendar. A cold-air drainage pocket, a lake, a north-facing slope, or a lot of nearby pavement all shift the real date. Your county extension office publishes local data and knows those pockets, and it costs nothing to ask. Compare your station numbers in our frost dates tool and confirm your zone in the growing zones lookup.

Fall lettuce is the better crop in most zones

This is worth planning around, and late August is exactly when to act on it.

Spring lettuce grows into rising temperatures. Every week the plant gets closer to the heat that will make it bolt, so you're racing a clock that speeds up.

Fall lettuce grows into falling temperatures. Every week gets more favorable. Heads size up slowly, the leaves stay sweet, and a light frost actually improves the flavor, because the plant converts starch to sugar as an antifreeze response. Lettuce shrugs off 28F, and under a low tunnel or row cover it will hold in the garden through most of a zone 6 or 7 winter.

The one difficulty is germination. Sowing in mid-August means putting seed into soil that may be 85F, which lettuce refuses. Workarounds:

• Sow in the shade of a taller crop, or under a board laid over the row, checking daily and removing it the moment sprouts show.
• Water the furrow with cold water right before sowing, then again each morning.
• Start in trays indoors or in a cool garage and transplant at 3 weeks. Lettuce, unlike cucumbers, transplants easily.
• Pre-chill the seed: put it on a damp paper towel in a sealed bag in the fridge for 3 to 5 days, then sow. Chilled seed germinates in warm soil.

Our guide to what to plant in September has the full fall crop list and timings if you're planning the whole bed.

Lettuce Types, Days to Maturity, and Which to Grow

Four families, and they behave differently enough that mixing them is what gives you a long harvest.

Loose leaf is the beginner crop and the succession crop. No head to form, so nothing to wait for, and you can start cutting baby leaves at 25 to 30 days. Most bolt-resistant family of the four.

Butterhead forms a soft loose head with a buttery texture. Buttercrunch in particular is one of the more heat-tolerant heading types and holds a couple of weeks longer than most before bolting.

Romaine builds an upright head with a heavy crunchy rib. Jericho was bred in Israel specifically for heat and is the best romaine for a marginal spring window. Little Gem is a miniature romaine that matures in about 50 days, which makes it useful when you're short on time.

Crisphead is the supermarket iceberg, and it's the hardest to grow at home. It needs 70 to 100 days of steadily cool weather to form a tight head, which most gardens simply don't have in spring. Grow it in fall in zones 6 and warmer, or skip it.

Practical recommendation: put in loose leaf for speed and continuous cutting, romaine for substance, and butterhead for quality. Leave crisphead to the fall bed or the grocery store.

How to Grow Lettuce Without It Bolting

Bolting is the plant switching from making leaves to making seed. Once it starts, it doesn't reverse. The head elongates into a stalk, the leaves turn bitter from milky latex compounds, and the crop is done.

Three things trigger it, and they stack:

1. Soil and air temperature above about 75F, sustained. This is the main one.
2. Day length above roughly 14 hours. Lettuce is a long-day plant, which is why late June bolts crops that were fine in May even during a cool spell.
3. Stress. Drought, root damage from transplanting, or crowding all push a plant to reproduce early.

Six things that actually delay it:

Succession sow every 2 weeks. The most reliable defense on the list. Instead of one 20-foot row that all matures the same week and bolts the week after, sow a 3-foot section every 2 weeks from your start date to your cutoff. Something is always young, and losing one sowing to a heat wave costs you two weeks rather than a season.

Give afternoon shade once temperatures climb. From late May on, 30 to 40 percent shade cloth over the row, or the east side of a trellised crop, drops leaf temperature 5 to 10 degrees. Planting lettuce on the north side of a cucumber trellis or a row of caged tomatoes does the same job for free, and by the time the taller crop casts real shade, the lettuce needs it. If you're planning that bed, our guides to how to grow cucumbers and how to grow tomatoes cover the spacing those crops need first.

Keep the soil consistently moist. Dry soil is a stress signal and the plant reads it as a reason to bolt. Shallow roots mean this needs attention, and the next section covers it.

Choose bolt-resistant varieties for late sowings. For anything going in after mid-May, use Jericho, Nevada, Muir, Adriana, Buttercrunch, or Slobolt. Bred for it, and they buy 2 to 3 weeks over a standard variety.

Harvest younger. Baby leaf at 30 days is picked long before the plant thinks about flowering. When the forecast turns hot, cut everything as baby leaf rather than waiting for full heads.

Mulch. 1 to 2 inches of straw or fine compost keeps the root zone several degrees cooler and holds moisture. Keep it off the crown.

Catch it early if it starts. A plant just beginning to elongate is still edible if you cut it that day. Once the stalk is up and the leaves taste bitter, it's compost. Leaving a couple of bolted plants to flower does bring in beneficial hoverflies, whose larvae eat aphids, so there's a reason not to pull every one.

Soil, Sun, and Spacing

Lettuce is one of the few vegetables that does fine in partial sun, and it wants that in summer.

• Spring and fall: 6 hours of sun for the best growth.
• Summer: 4 hours, ideally morning sun with afternoon shade.
• Minimum: 3 to 4 hours, though growth is slow and leaves get floppy.

Target pH is 6.0 to 7.0. Lettuce is not fussy.

Soil prep:

• Work 2 inches of finished compost into the top 6 inches. Lettuce roots stay in that layer, so deep digging isn't the point.
• Rake to a fine tilth. Lettuce seed is tiny and will not push through clods or a crust.
• Sow shallow. 1/8 to 1/4 inch, barely covered. Lettuce seed needs light to germinate, so burying it an inch deep is why a row sometimes never comes up.
• Nitrogen is welcome here, unlike with peppers and cucumbers. Leaves are the crop, so a balanced feed or diluted fish emulsion every 2 to 3 weeks keeps growth fast, and fast growth is tender growth.

Spacing after thinning:

Thin ruthlessly. Crowded lettuce bolts earlier, stays small, and holds moisture on the leaves, which invites downy mildew and slugs. The thinnings are the first salad of the season, so nothing is wasted. Our plant spacing calculator works out plant counts for a specific bed.

Worked example. A 4x8 raised bed, 32 square feet, planted with loose leaf lettuce at 8 inches in row and 12 inches between rows. The 8-foot length holds 12 plants per row, and the 4-foot width holds 4 rows, so 48 plants. At roughly 6 ounces of leaf per cut and 3 cuts per plant across the season, that's about 54 pounds of lettuce, which is far more than a household eats. In practice, plant a quarter of the bed, 12 plants, and sow another quarter every 2 weeks. Water need is about 0.75 to 1 inch per week, which over 32 square feet is 15 to 20 gallons weekly, or half that for the quarter bed actually in use.

Watering: Shallow Roots Change the Rules

Lettuce roots sit in the top 6 to 8 inches, and many feeder roots are in the top 3. That single fact drives every watering decision.

The deep-and-infrequent advice that works for tomatoes and peppers is wrong here. Those crops have roots 2 feet down that reach water you didn't apply this week. Lettuce doesn't. When the top 3 inches dry out, a lettuce plant is genuinely short of water within a day.

What works:

• Light and frequent, not deep and rare. Roughly 0.75 to 1 inch per week, but split across 3 or 4 waterings rather than 1 or 2. In hot weather, a short daily watering is fine and often better.
• Wet the top 6 inches, no deeper. Water below that is wasted, and it leaches nitrogen past the roots.
• Check by finger at 1 inch, not 2. Dry at 1 inch means water now.
• Mulch 1 to 2 inches. This roughly halves how fast the surface dries.
• Morning watering. Lettuce leaves that stay wet overnight get downy mildew and attract slugs.
• Overhead is acceptable here, unlike with tomatoes, as long as it's early enough for leaves to dry by mid-morning. It also cools the plant, which helps in heat.
• Containers dry out fast. A shallow window box may need water twice a day in July.

Our watering guide tool converts inches per week into minutes on your hose for your specific setup.

Water stress shows up as bitterness before it shows up as wilting. If your lettuce tastes sharp but hasn't bolted, look at your watering first.

Cut and Come Again: Getting 3 or 4 Harvests From One Plant

Loose leaf, and to a lesser extent romaine and butterhead, will regrow after cutting. Done right, one sowing feeds you for 6 to 8 weeks.

The method:

1. Wait until leaves are 4 to 6 inches tall. Roughly 30 days for loose leaf.
2. Cut the whole plant about 1 to 1.5 inches above the soil, straight across with scissors or a sharp knife.
3. Leave the crown intact. The growing point sits right at soil level, and cutting below it kills the plant. This is the step people get wrong.
4. Water and feed immediately with a diluted liquid feed. The plant is rebuilding leaves and wants nitrogen.
5. Cut again in 2 to 3 weeks.
6. Expect 3 or 4 cuts. Each one is a little smaller and a little more bitter, and the fourth is usually the last worth taking.

Cut in the morning, when leaves are full of water and crisp. Lettuce cut at 3 p.m. on a hot day is limp before it reaches the kitchen.

The alternative for heading types is outer leaf picking: take the 3 or 4 largest outer leaves and leave the center growing. Slower per harvest but continuous, and it works well on butterhead and romaine, which don't regrow well from a full cut.

Common Lettuce Problems

Slugs are the biggest practical pest, and they do most of their damage overnight in damp weather. Watering in the morning rather than the evening removes half the problem on its own.

Growing Lettuce in Containers

Lettuce may be the best container vegetable there is. Shallow roots, fast turnaround, and it tolerates the partial shade a patio usually offers.

• 6 to 8 inches of depth is enough. A wide shallow container beats a deep narrow one.
• A 12-inch pot holds 3 or 4 loose leaf plants, or a dense baby leaf sowing.
• Window boxes and grow bags work well. So do the shallow trays sold for microgreens, for a baby leaf cut.
• Potting mix, not garden soil.
• Move it. The main container advantage: shift the pot into afternoon shade during a hot spell and buy weeks of extra harvest.
• Water more often than you think, since a shallow container dries fast.
• Feed every 2 weeks with a half-strength liquid feed.

Harvesting and Storing Lettuce

Harvest signals by type:

• Loose leaf: any time leaves reach 4 inches. There's no wrong moment, only a preference for size.
• Butterhead: the head feels loosely filled and slightly soft when you cup it. Don't wait for firm.
• Romaine: the head is upright, 8 to 12 inches tall, and firm when squeezed gently. Little Gem is ready at 6 inches.
• Crisphead: the head feels firm all over with gentle pressure. Waiting past that point splits the head and starts bolting.

Pick in the morning. Sugar content is highest and leaves are fully hydrated before the sun pulls water out of them.

Storing:

• Rinse in cold water, spin or pat completely dry. Water left on leaves is what turns them to slime. This is the whole secret.
• Loose in a bag or container with a dry paper towel, in the crisper. 7 to 10 days for leaf types, up to 2 weeks for romaine and crisphead.
• Reviving limp lettuce: submerge in ice water for 15 to 30 minutes. It genuinely works, because the cells reabsorb water.
• Whole heads keep longer than cut leaves. Cut only what you're using.
• Do not freeze or can lettuce. There's no method that preserves anything worth eating. Lettuce is a fresh crop, which is exactly why succession sowing matters so much.
• Save the outer leaves rather than discarding them. Chopped into soup at the end of cooking they wilt like spinach.

Our when to harvest tool has maturity windows for lettuce alongside the rest of the garden, and if you're setting up a new bed for a fall crop, the raised bed soil calculator sizes the mix.

FAQ

Why does my lettuce bolt so fast?

Heat and day length, working together. Sustained temperatures above about 75F plus days longer than roughly 14 hours tell the plant to flower, and drought or root disturbance speeds it up further. Sow every 2 weeks so something is always young, use afternoon shade from late May on, pick bolt-resistant varieties like Jericho or Muir for late sowings, and harvest as baby leaf when a heat wave is forecast.

Can you grow lettuce in summer?

In zones 7 and colder you can stretch it with afternoon shade, heavy mulch, frequent light watering, and bolt-resistant varieties harvested as baby leaf. In zones 8 through 10, midsummer lettuce is a losing fight and the better plan is to skip July and August and grow it as a fall and winter crop instead. Either way, cut it young rather than waiting for full heads.

How often should I plant lettuce?

Every 2 weeks from your spring start date to your cutoff, then again through your fall window. A short 3-foot row each time is plenty for most households. Sowing one big planting gives you more lettuce than you can eat in a single week and then nothing, and it puts everything at risk from one hot spell.

What lettuce grows fastest?

Loose leaf types are the quickest, ready as baby leaf in 25 to 30 days and as full plants in 40 to 50. Black Seed Simpson and the Salad Bowl types are among the fastest. Romaine needs 60 to 75 days, and crisphead needs 70 to 100, which is why crisphead is the hardest type to fit into a spring window.

Why is my lettuce bitter?

Usually the plant has started to bolt, even before the flower stalk is visible, which produces milky bitter compounds throughout the leaves. Water stress and sustained heat cause the same thing without bolting. Cut and use the crop immediately if you catch it starting, and going forward, water more frequently, mulch, and harvest younger. Bitterness doesn't reverse once it's in the leaves.

Can lettuce survive frost?

Yes, and it usually tastes better afterward. Most lettuce handles 28F without protection, and the plant converts starch to sugar as an antifreeze response, so a light frost sweetens the leaves. Under row cover or a low tunnel, romaine and loose leaf hold in the garden through most of a zone 6 or 7 winter. Hard freezes below the mid-20s will damage outer leaves, but the crown often regrows.

How deep does soil need to be for lettuce?

Six to 8 inches is plenty, which is why lettuce suits containers, window boxes, and shallow raised beds so well. Most feeder roots sit in the top 3 inches. The tradeoff is that shallow roots can't reach stored water, so a lettuce bed needs light watering 3 or 4 times a week rather than one deep soaking.

Should I plant lettuce in spring or fall?

Fall is better in most zones. Spring lettuce grows into rising heat, so you're racing a clock, while fall lettuce grows into cooling weather and gets steadily happier, with sweeter leaves and a much longer harvest window. The only hard part of fall lettuce is germinating seed in warm August soil, which you solve by shading the row, pre-chilling the seed in the fridge for 3 to 5 days, or starting in trays somewhere cool.

Updated August 2026