Growing Iceberg Lettuce — print version.
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SUS Farms · Utah Seed Library
Growing Iceberg Lettuce in Utah
vegetable · Asteraceae · cool season · 70 days to harvest
MethodIndoor or direct
Days to maturity70 days
Seed depth0.125″
Plant spacing12″
Row spacing18″
Germ. temp40–75°F
Schedule (May 15 last frost · Sevier County)
| Start indoors | 4/3 |
| Transplant out | 4/24 |
| Direct sow | 4/17 |
| First harvest | 7/3 |
Planting depth, drawn to scale
Step-by-step
- 1. Start indoors 6 weeks before last frost. Seed-starting mix in 2-4" cells. Bottom heat at 40–75°F until germination, then drop to room temperature. 14-16 hours of light from clip-lamp 2" from leaves.
- 2. Harden off for 7 days. Day 1: 1 hour outside in shade. Add an hour and more sun each day. Skip if windy or below 50°F.
- 3. Transplant 12″ apart in rows 18″ apart. Soil should be at least 40°F before planting. Black plastic mulch laid two weeks ahead helps in cool springs.
- 4. Mulch and water consistently. 2" of straw or wood chip around the base. Drip line at surface. 1" per week including rain.
- 5. Harvest around day 70. Crisphead — needs 60-day cool window. Spring crop only at our elevation; bolts in July heat.