Tennessee · zones 7a–8a
When to plant lettuce in Tennessee.
Sow between Mar 1 to Apr 15 in a typical year, keyed to Tennessee's median last frost around Apr 8. A second, fall sowing fits Aug 11 to Oct 10. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Lettuce dates for a typical Tennessee season.
Direct sow
Mar 1 to Apr 15
Keyed to the ~Apr 8 last frost. Sow 0.25" deep, 6" apart.
Fall round
Aug 11 to Oct 10
Counted back from the ~Oct 25 first frost.
Harvest
~45 days later
~0.4 lb per plant over ~1 weeks.
Tennessee spans more than one climate: Zone 7 is the most common zone, but the state runs 7a to 8a. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
Tennessee growing notes
Lettuce is the crop that tells you which Tennessee you're gardening in.
Heat arrives on a different date in every division
West Tennessee's bottomland heats up first each spring, often running several degrees warmer than the Highland Rim or the mountain valleys of the east on the same calendar day, which means a West Tennessee lettuce bed bolts to seed earlier than the same variety planted in Middle or East Tennessee. Gardeners in the west do better leaning hard on quick, heat-tolerant leaf types and treating the spring window as short, while East Tennessee's cooler valley floors stretch that same window out by a couple of extra weeks most years.
Sixteen rounds fit into a Tennessee season if you succession sow, which for lettuce means dropping a short row every week to ten days rather than planting the whole bed at once. That spreads the harvest out and, more usefully, spreads the risk: if one sowing bolts early during a surprise heat spike, the next one behind it is still a week or two from that same trigger. Direct sow a quarter inch deep once soil holds at least 40 degrees at two inches, though 55 to 70 is where germination really speeds up.
Bolting is a heat signal, not a failure
A lettuce plant that suddenly sends up a tall central stalk and turns bitter has received a combined heat-and-daylength signal it cannot ignore, and once that stalk starts, nothing brings the leaves back to their prior sweetness. Sustained warm temperature is half the trigger, not one hot afternoon, so a plant that has been fine for weeks can bolt within days once nighttime lows stop dropping back down. The other half is simply how long the days have gotten, which is why a bed sown in June, heat and long days working together, bolts faster than the same variety sown in August as days are already shortening. Harvesting outer leaves continuously, rather than waiting for a full head, gets usable lettuce out of a planting before that clock runs out.
Shade cloth over the row from late spring on buys real time in every part of the state, since it drops soil and leaf temperature a meaningful amount without blocking the light lettuce still needs. Mulch heavily too; bare soil radiates heat back up into the underside of the plant even when the air above feels tolerable, and that radiant heat is part of what pushes a marginal planting over the bolting threshold on an otherwise ordinary afternoon.
Slugs love what humidity gives them
Tennessee's humidity that punishes cucumbers and tomatoes with disease works in slugs' and snails' favor instead, since both need damp cover to move and feed through the day. A ring of coarse sand around a lettuce bed slows them down without any spray, and some gardeners get extra mileage layering crushed eggshell on top, though that part is more folk remedy than proven barrier. A shallow dish of beer sunk level with the soil surface, checked every couple of days, drowns a surprising number for the effort. Damage shows as ragged holes with a shiny slime trail nearby, distinct from flea beetle damage, which is a fine peppering of tiny round holes with no trail at all, and from aphids, which leave no holes whatsoever, just curled leaves and a sticky film.
Cutworms take down whole seedlings at the soil line overnight rather than chewing holes in standing leaves, so a row of transplants that is simply gone by morning, stems and all, points to cutworms rather than slugs. Push a paper or cardboard collar an inch deep into the ground, circling each transplant's stem, and the cutworm simply cannot reach it; the fix costs nothing but a few minutes with scissors and a stack of cereal boxes headed for recycling.
In Tennessee: watch for
The pests that find lettuce here.
A middle-length season, about 200 frost-free days, means lettuce, leaf overlaps aphids for a stretch each summer. Check plants every week or two and treat early.
Clusters tucked into the heart of the head.
Organic fix: Rinse well; insecticidal soap on young plants.
Ragged holes and slime trails, worse after rain.
Organic fix: Iron-phosphate bait; a diatomaceous-earth ring; hand-pick at night.
Seedlings clipped off at the soil line overnight.
Organic fix: Collars around the stems; Bt or diatomaceous earth.
Pale yellow patches boxed in by the leaf veins, with white fuzz underneath.
Organic fix: Give plants room, let them dry between waterings, clear old leaves, and pick resistant varieties.
Your season math: Tennessee gives lettuce about 200 frost-free days, and it needs roughly 45 days to a first harvest. That fits about 16 re-sown rounds across the season, so you can keep it coming instead of picking once.
Planting lettuce in Tennessee: questions
When should I plant lettuce in Tennessee?+
In a typical Tennessee year, sow lettuce between Mar 1 to Apr 15, keyed to the state's median last frost around Apr 8. There's also a fall window: Aug 11 to Oct 10. Your exact dates shift with your ZIP code and microclimate.
What USDA zone is Tennessee?+
Tennessee spans zones 7a–8a, mostly zone 7. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many lettuce plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.