Utah · zones 6a–8b
When to plant lettuce in Utah.
Sow between Mar 24 to May 8 in a typical year, keyed to Utah's median last frost around May 1. A second, fall sowing fits Jul 22 to Sep 20. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Lettuce dates for a typical Utah season.
Direct sow
Mar 24 to May 8
Keyed to the ~May 1 last frost. Sow 0.25" deep, 6" apart.
Fall round
Jul 22 to Sep 20
Counted back from the ~Oct 5 first frost.
Harvest
~45 days later
~0.4 lb per plant over ~1 weeks.
Utah spans more than one climate: Zone 6 is the most common zone, but the state runs 6a to 8b. 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.
Utah growing notes
Lettuce runs on borrowed time once Utah's sun gets serious.
Heat and long summer days push bolting earlier than the calendar suggests
Lettuce reads a run of days above 75 degrees, stacked onto Utah's already-long summer daylight, as its cue to bolt, throwing up a bitter flower stalk well before a plan built around a cooler, shorter-day climate would expect it to. Elevation itself is not the trigger the way local gardening lore sometimes claims; what actually shortens the harvest window here is the state's dry heat arriving on top of daylength that is already stretching toward summer solstice. A head that looks perfectly fine one week can taste sharp and bitter the next once that combination flips.
Loose-leaf types built for quick turnover, reaching harvest in around 45 days, beat the trigger more reliably than a slow-heading type does simply by finishing before the season's worst heat stretch arrives, and picking outer leaves as they size rather than waiting for a full head stretches the harvest window further before bolting becomes a risk.
Afternoon shade buys real time in a Utah summer
A strip of shade cloth over the lettuce row from roughly midday through late afternoon drops leaf temperature enough to buy real time before that heat-and-daylength trigger fires, measurably delaying bolting compared to a row left in full sun through a Utah summer afternoon. Morning sun alone, before the day's heat peaks, is usually enough light for good leaf growth without pushing the plant toward that stress response.
Twelve rounds of lettuce are realistic across Utah's season if sowings are spaced roughly every 2 weeks, with the toughest stretch to manage sitting in early-to-mid summer; many gardeners simply skip a sowing or two through the hottest weeks and lean on spring and fall rounds instead, which finish faster and hold quality longer without needing shade cloth at all.
Slugs follow the irrigation, not the season
Slugs and snails in a Utah garden track moisture more than temperature, showing up heaviest wherever flood or drip irrigation keeps ground consistently damp, which makes a lettuce bed on a frequent watering schedule more exposed than one on the state's typical deeper, less frequent turn. A shallow dish of beer sunk to soil level, checked and emptied every few days, is a reliable trap that needs no chemical control at all.
Aphids and cutworms round out the pest list here; aphids cluster on the underside of young leaves and rinse off with a firm water spray, while cutworms work at night, severing seedlings at the soil line, and a paper collar pushed an inch into the ground around each transplant blocks them without any spray needed.
In Utah: watch for
The pests that find lettuce here.
A middle-length season, about 157 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: Utah gives lettuce about 157 frost-free days, and it needs roughly 45 days to a first harvest. That fits about 12 re-sown rounds across the season, so you can keep it coming instead of picking once.
Planting lettuce in Utah: questions
When should I plant lettuce in Utah?+
In a typical Utah year, sow lettuce between Mar 24 to May 8, keyed to the state's median last frost around May 1. There's also a fall window: Jul 22 to Sep 20. Your exact dates shift with your ZIP code and microclimate.
What USDA zone is Utah?+
Utah spans zones 6a–8b, mostly zone 6. 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.