Growing Lettuce in the Garden: Types, Timing, and Bolt Prevention

Lettuce is the most reliable cool-season vegetable for a zone 7a garden. It germinates in near-freezing soil, tolerates light frost, and can go from seed to first harvest in 40-55 days.

Lettuce is the most reliable cool-season vegetable for a zone 7a garden. It germinates in near-freezing soil, tolerates light frost, and can go from seed to first harvest in 40-55 days. The failure mode — bolting and bitterness in summer heat — is predictable and avoidable if you plan around it.

I don't grow lettuce as a dedicated plot crop at the Long Island garden, but I direct-sow it in gaps between other crops every spring and again in late August. It fills space, produces fast, and needs almost nothing once established. The guidance here is sourced from Cornell Cooperative Extension, UMass Extension, and Penn State Extension.

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Types of Lettuce

Per Cornell Cooperative Extension, lettuce is classified into four main groups:

Loose-leaf: No central head. Harvest individual outer leaves while the plant continues to grow. The most productive type for home gardens — one plant can be cut multiple times ("cut-and-come-again") over 4-6 weeks. Varieties include 'Black Seeded Simpson', 'Red Sails', 'Oak Leaf'. Per Cornell, "loose-leaf types are ready to harvest in about 40 to 45 days."

Butterhead (Boston/Bibb): Forms a loose, soft head with tender, sweet leaves. Per Cornell, "ready to harvest in about 75 to 90 days." Slower than loose-leaf but better flavor and texture for salads. 'Buttercrunch' is the standard zone 7a variety — it holds heading for longer before bolting than most types.

Romaine (Cos): Upright, elongated heads with thick midribs. Per Cornell, "takes about 75 to 85 days from seeding." More bolt-resistant than butterhead in warm weather. 'Winter Density' and 'Little Gem' are compact romaine types that tolerate cool weather well.

Crisphead (Iceberg): The type most people think of as "lettuce" from grocery stores. Requires the coolest, longest growing conditions of any type. Per Cornell, "requires a long, cool growing season" and "is difficult to grow in most home gardens east of the Rockies" because of the timing demands. In zone 7a, crisphead types are best grown as a fall crop.