When should I plant Lettuce, Black Seeded Simpson in Zone 10a?

Start Lettuce, Black Seeded Simpson seeds indoors around Jan 9. Transplant outdoors after Jan 30. Expect first harvest around Mar 6.

What is the last frost date for Zone 10a?

The average last spring frost date for Zone 10a is Feb 20. The first fall frost averages Dec 1, giving a 284-day growing season.

Can I grow Lettuce, Black Seeded Simpson in Zone 10a?

Yes. Lettuce, Black Seeded Simpson needs 45 days to harvest. Zone 10a has a 284-day growing season, which is sufficient. You can plant up to 17 successions.

Lettuce, Black Seeded Simpson illustration

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🥬 Growing Lettuce, Black Seeded Simpson in Zone 10a

Zone 10a has a year-round growing season. Lettuce, Black Seeded Simpson can be planted almost any time with proper planning. Last frost: Feb 20. First frost: Dec 1.

Planting Calendar

Indoor

Outdoor

Harvest

Jan 9Dec 1

Season: Feb 20 – Dec 1 (284 days) · Succession: plant every 2 weeks (up to 17x)

Zone10a

Last FrostFeb 20

First FrostDec 1

Season Length284 days

Days to Harvest45

SunPart Sun / Part Shade

Frost ToleranceLight

Spacing4/sqft (6" apart)

When to Plant Lettuce, Black Seeded Simpson in Zone 10a

Start Seeds Indoors: Jan 9

Start Lettuce, Black Seeded Simpson seeds indoors around Jan 9 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 4–10 days.

Transplant Outdoors: Jan 30

Transplant Lettuce, Black Seeded Simpson seedlings outdoors after Jan 30. Wait until soil temperature reaches 40°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: Mar 6

First harvest approximately Mar 6 (~35 days from transplant). Continue harvesting until first frost (Dec 1).

Fall Planting: Oct 6

For a fall harvest, plant Lettuce, Black Seeded Simpson around Oct 6 (8 weeks before first frost).

Companion Planting

✅ Strawberries✅ Carrots✅ Beets✅ Cucumbers✅ Radishes

Lettuce, Black Seeded Simpson in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Plan Your Lettuce, Black Seeded Simpson Garden

Track Lettuce, Black Seeded Simpson from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Lettuce, Black Seeded Simpson Growing Guide