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Growing Black Seeded Simpson in Zone 7a
Lactuca sativa
Varies for Zone 7a
🌡️ USDA Hardiness Zone 7a
Mild Continental/Transition
USDA 2023 Verified
Growing Season
180-210 days
Winter Minimum
0°F to 5°F
(-17.8°C to -15.0°C)
Last Spring Frost
April 5
50% probability
First Fall Frost
November 6
50% probability
AHS Heat Zone 5-8
31 to 45 heat days per year • Moderate heat stress
Typical regions: Boston MA, Long Island NY, Virginia, Oklahoma City OK
📊 Data Source:
USDA Plant Hardiness Zone Map 2023 • Frost dates from NOAA station USW00014739 • Last verified: 1/22/2026
📊 Zone Compatibility Analysis
💾 Suitability computed by Solara Agricultural Intelligence Platform
📅 Zone 7a Planting Calendar for Black Seeded Simpson
Based on NOAA climate normals for Zone 7a. Dates show 50% probability (average year).
🌱 Start Seeds Indoors
6-8 weeks before April 5
Approximately late winter to early spring
🪴 Transplant Outdoors
After April 5
When soil reaches 60°F+
🌾 Direct Sow (Alternative)
2 weeks after April 5
For warm-season crops
🥕 Expected Harvest
44-54 days after planting
Complete before November 6
💡 Zone 7a Growing Tips
- • Growing season: 180-210 frost-free days
- • ⚠️ Season extension required - consider cold frames or hoop houses
- • Monitor soil temperature before transplanting (minimum 55-60°F for most crops)
⚠️ Zone 7a Challenges
⚠️Variable spring weather
⚠️Summer heat
⚠️Occasional drought
✅ Best Plants for Zone 7a
✓Extended vegetable season
✓Most fruit trees
✓Figs with protection
❄️ Winter in Zone 7a
Mild winters with lows reaching 0°F to 5°F.
☀️ Summer in Zone 7a
Hot summers with extended growing season.
🔥 Heat Management for AHS Zone 5-8
This zone experiences 31 to 45 heat days per year with moderate heat stress.
🌡️Regular mulching
🌡️Drip irrigation
🌡️Afternoon shade for heat-sensitive plants
Source: American Horticultural Society
📊 Black Seeded Simpson Quick Facts
Days to Maturity
44-54
Difficulty
beginner
Season
spring
Type
Heirloom
📍 View Black Seeded Simpson Guide for Other Zones
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