Planting Guides

When to Plant Lettuce in Boston: Complete Guide + Best Varieties for Zone 6b

Boston, Massachusetts

USDA Zone 6b

Last Frost: Apr 20

Last updated: October 30, 2025

Plant lettuce in Boston from April 5-May 15 for spring harvest and August 15-September 30 for fall crops in Zone 6b.

DDorothy "Dot" Williams

October 30, 2025

Boston lettuce garden with multiple varieties growing in raised beds during spring planting season — — Image © PlantReference.org 2026

Quick Answer

Plant lettuce in Boston April 5-May 15 for spring harvest, August 15-September 30 for fall. Buttercrunch handles variable weather best.

TL;DR

Plant lettuce in Boston from April 5-May 15 for spring harvest and August 15-September 30 for fall crops. Zone 6b provides a 183-day growing season perfect for multiple successions. Buttercrunch and Red Oak Leaf perform best in Boston's variable spring weather, while Romaine excels in fall plantings for superior quality.

Frequently Asked Questions

When should I start lettuce seeds indoors in Boston?

Start lettuce seeds indoors 6-8 weeks before the last frost date of April 19. Begin with Lactuca sativa 'Romaine' and Lactuca sativa 'Iceberg' on March 1-15 since they need the longest growing season. Start Lactuca sativa 'Buttercrunch' and Lactuca sativa 'Bibb' on March 15-30 for transplanting after hardening off.

What's the best lettuce variety for Boston's unpredictable spring weather?

Lactuca sativa 'Buttercrunch' handles Boston's variable spring conditions better than any other variety. It tolerates late frosts, temperature swings, and maintains quality longer than traditional butterhead types. This All-America Selection winner was specifically developed for reliability in challenging climates like New England.

Can I grow lettuce through Boston summers?

Boston summers are too hot for quality lettuce production. Temperatures above 80°F trigger bolting and bitter flavors. Plan your last spring harvest for early June and resume planting in mid-August for fall crops. Use succession planting of quick-maturing varieties like Lactuca sativa 'Mesclun Mix' for the best summer strategy.

When do I plant lettuce for fall harvest in Boston?

Plant fall lettuce from August 15 through September 30, calculating backwards from Boston's October 19 first frost date. Lactuca sativa 'Iceberg' needs to be planted by August 10 (90 days before frost), while Lactuca sativa 'Red Oak Leaf' can be planted as late as September 4 (45 days before frost).

How do I protect lettuce from Boston's late frosts?

Use lightweight row covers supported by wire hoops to protect lettuce from Boston's unpredictable late frosts. Row covers provide 2-4 degrees of protection and can be left in place during the day if temperatures remain below 45°F. Remove covers once consistent warm weather arrives to prevent overheating.

What spacing works best for lettuce in Boston's short growing season?

Space lettuce closer than package recommendations in Boston to maximize yields in the short season. Plant Lactuca sativa 'Buttercrunch' 6-8 inches apart, Lactuca sativa 'Red Oak Leaf' 4-6 inches apart, and broadcast Lactuca sativa 'Mesclun Mix' thickly for cut-and-come-again harvests. Dense plantings also help suppress weeds and conserve soil moisture.

How do I deal with slugs on lettuce in Boston's humid climate?

Control slugs by watering early morning instead of evening, removing debris around beds, and using iron phosphate baits (Sluggo) applied around bed perimeters. Boston's humid spring conditions favor slug activity from May through June. Copper strips around raised beds provide excellent long-term protection without ongoing maintenance.

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Tagged with

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Written By

Dorothy "Dot" Williams

Dot grew up on a small farm in rural Virginia and has maintained a vegetable garden for decades. After retiring from teaching elementary school, she became a Master Gardener volunteer and spends her time mentoring new gardeners at community garden plots in Richmond. She's especially knowledgeable about heirloom varieties, seed saving, and traditional growing methods passed down from her grandmother. Dot's no-nonsense advice comes from extensive trial and error—she's seen every tomato disease, pest problem, and weather disaster imaginable. Her biggest pet peeve is gardeners who overcomplicate simple tasks. "Plants want to grow," she often says. "Your job is to not get in their way."