How far apart to plant lettuce depends heavily on type and how you intend to harvest it. Head lettuce needs 12 inches between plants and, per Clemson Cooperative Extension and Utah State University Extension, considerably more between rows in an open garden than a tight raised bed allows. Loose-leaf lettuce needs much less -- 6 inches in-row is standard. Utah State University Extension makes the underlying logic explicit: "initial and eventual spacing depends on intended harvesting stage," not on lettuce being one uniform crop.
Spacing at a Glance
Lettuce spacing reference
Type
In-row spacing
Between-row spacing
SFG (per sq ft)
Leaf lettuce
6 in (range 4-10 in)
12-24 in
0.25 (4/sq ft)
Head lettuce (raised bed)
12 in
12 in
1
Head / crisphead lettuce (traditional row garden)
12-15 in
20-36 in
n/a
Leaf lettuce figures match this site's Plant Spacing Calculator comfortably within extension ranges. Head lettuce's in-row figure (12 in.) matches the calculator exactly, but its between-row figure of 12 in. is well below the 20-36 in. that Clemson HGIC and Utah State University Extension recommend for an open row garden -- the tighter number reflects raised-bed spacing, the same way it does for kale.
In a 4×8 ft raised bed, leaf lettuce at 6 in./12 in. fits about 16 plants per row and 4 rows -- roughly 64 plants. Head lettuce at 12 in./12 in. fits about 8 plants per row and 4 rows -- 32 heads, though a traditional open garden at the wider 20-36 in. row spacing would fit far fewer per bed.
Plant Spacing Calculator: Lettuce
Garden style
Units
Recommended: 24″ in-row × 36″ between rows
Space between plants along the row.
Space between rows (aisle / path width).
The math:
Plants per row = floor(Bed Length ÷ In-row Spacing)
Rows = floor(Bed Width ÷ Between-row Spacing) · Total = Plants per row × Rows
Leaf and head lettuce aren't just two sizes of the same plant -- Clemson Cooperative Extension recommends growing head lettuce from purchased transplants rather than direct-seeding and thinning, which is the standard approach for leaf lettuce. That's a genuinely different starting method, not just a different final spacing number.
Utah State University Extension frames the underlying logic clearly: spacing depends on "intended harvesting stage" more than on lettuce type alone. Baby-leaf greens need far less room and can be harvested thick and young; a full crisphead needs to bulk up over its full spacing allotment to form a proper head at all.
Why Spacing Matters for Lettuce
The practical risk with lettuce spacing is under-spacing a head type by mistake -- a reader searching generically for "lettuce spacing" without specifying type could easily apply loose-leaf figures to a crisphead planting and end up with heads that never fully form, since head lettuce needs roughly two to three times the in-row space and meaningfully more between-row space than loose-leaf types.
Thinning timing also differs by type: Clemson Cooperative Extension recommends thinning leaf lettuce seedlings once they're 1 to 2 inches tall, well before the crowding that would stunt a head-forming variety later on.
What's the spacing difference between leaf and head lettuce?
Leaf lettuce needs 4-10 inches in-row with 12-24 inches between rows. Head/crisphead lettuce needs 12-15 inches in-row and considerably more between rows in an open garden -- head lettuce needs substantially more room overall.
When should you thin lettuce seedlings?
Leaf lettuce is typically thinned once seedlings are 1-2 inches tall, per Clemson Cooperative Extension; final spacing for leaf types runs 4-8 inches.
Why do lettuce spacing guides give such a wide range?
Because the correct spacing depends on lettuce type and intended harvest stage -- baby greens need far less room than a full crisphead, per Utah State University Extension.
Should I direct-seed or transplant head lettuce?
Clemson Cooperative Extension recommends growing head lettuce from purchased transplants rather than direct-seeding, unlike leaf lettuce, which is commonly direct-seeded and thinned.
How far apart do rows need to be for head lettuce vs. leaf lettuce?
Head/crisphead lettuce needs considerably more between-row space in an open garden than leaf lettuce does -- roughly double, depending on source.
Free book · 23 pages, PDF
The Companion Planting Chart
What grows well together, what to keep apart, and why.
Sources & further reading
Spacing figures and facts on this page are sourced directly from university cooperative extension services, cited below, not estimated or invented.
