Planting Guides
When to Plant Lettuce in Memphis: Complete Guide + Best Varieties for Zone 7b
Memphis, Tennessee
USDA Zone 7b
Last Frost: Apr 5
Last updated: October 30, 2025
Learn when to plant lettuce in Memphis with specific dates for Zone 7b. Compare 6 varieties and discover how to maximize the Bluff City's spring and fall lettuce windows with Mississippi River alluvial soil and Delta humidity management strategies.
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Quick Answer
Direct sow lettuce outdoors March 1-15 in Memphis. Fall sowing August 10-25 for the sweetest harvest. Summer gap mid-May through early August is unavoidable.
TL;DR
Direct sow lettuce outdoors March 1-15 or start seeds indoors February 10-25 for the spring window. Memphis's 210-day frost-free season and Zone 7b Mississippi Delta climate create a summer gap of 10-12 weeks (mid-May through early August) driven by the combination of 90°F+ heat with 75-85% humidity—the highest humidity of any city in this guide series. The fall window (September-November) is outstanding with Delta alluvial soil providing exceptional natural fertility. Lactuca sativa 'Buttercrunch' leads for bolt resistance. Downy mildew management is Memphis's defining lettuce challenge.
Frequently Asked Questions
When is the best time to plant lettuce in Memphis?
Direct sow lettuce outdoors March 1-15—it germinates in soil as cool as 40°F. Succession sow every 10-14 days through late April only because Memphis's Delta heat arrives earlier than Piedmont cities. For fall, start seeds indoors August 10-25 under AC—mandatory in Memphis where August soil exceeds 85°F. Fall lettuce from September through November produces the year's best quality. Memphis's 210-day season supports 7-9 succession plantings but the spring window is more compressed than the Carolinas.
What is the best lettuce variety for Memphis?
Lactuca sativa 'Buttercrunch' is the best all-around choice because its bolt resistance and thick, disease-resistant leaves handle Memphis's extreme humidity. Lactuca sativa var. crispa (Red Oak Leaf) at 45-55 days provides the best disease resistance—the open rosette form allows air circulation critical in 75-85% humidity. Mesclun mix at 30-40 days is essential for the compressed spring window. Lactuca sativa var. longifolia (Romaine) is strictly a fall crop—too slow for Memphis's compressed spring window.
Why is Memphis's humidity such a problem for lettuce?
Memphis's 75-85% humidity during the growing windows is the highest of any city in this 30-city guide series. This extreme moisture creates three compounding problems: downy mildew thrives in constantly moist air, slugs find ideal habitat in damp conditions, and heading types trap moisture between leaves promoting basal rot. Managing humidity through drip irrigation (never overhead), morning-only watering, aggressive 12-inch spacing, and looseleaf variety selection is the single most important strategy for Memphis lettuce success.
What makes Memphis's soil special for lettuce?
Memphis sits on Mississippi River alluvial deposits—deep, fertile, naturally productive soil that represents the best baseline growing medium of any city in this guide. The alluvial soil tests near-neutral pH (6.0-7.0) within lettuce's preferred range without amendment, provides excellent natural nutrition requiring less fertilization than other cities, and creates a mineral richness in lettuce flavor that amended soils cannot replicate. Memphis's soil advantage partially compensates for the humidity challenge.
How long is Memphis's summer lettuce gap?
Memphis's gap runs approximately 10-12 weeks from mid-May through early August—longer than the Carolinas' 8-10 weeks and comparable to Atlanta's 10-12 weeks. The gap is driven by the combination of 90°F+ daytime temperatures AND 75-85% humidity with nighttime temperatures above 72°F that sustain bolting around the clock. Memphis's Delta location at lower elevation creates more intense heat-humidity conditions than the elevated Piedmont cities to the east. No shade cloth or variety selection meaningfully reduces this gap.
Can I grow lettuce through Memphis's winter?
Limited winter production is feasible in Zone 7b with row covers or cold frames. Memphis's mild winters (average lows 30-35°F) support cold-hardy varieties like Lactuca sativa var. longifolia (Romaine) with frost tolerance to 20°F. Growth slows in December-January but the fertile alluvial soil continues providing excellent nutrition to overwintering plants. Memphis's winter humidity is lower than the warm-season spring-fall growing windows, actually reducing the downy mildew pressure that challenges production during the primary growing seasons.
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Marcus Washington
Marcus manages the grounds at a historic property in Memphis and runs a side business doing residential garden design. He grew up helping his grandfather maintain a large vegetable garden in the Mississippi Delta and carried that knowledge into formal training—he has a degree in landscape technology. Memphis sits in a sweet spot for growing: long warm seasons, decent rainfall, and mild enough winters that many marginally hardy plants survive. Marcus writes about Southern gardening traditions, ornamental garden design, and dealing with the humidity and heavy rainfall that define the Mid-South climate.
