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Growing Tom Thumb in Zone 6a
Lactuca sativa
Varies for Zone 6a
🌡️ USDA Hardiness Zone 6a
Moderate Continental
USDA 2023 Verified
Growing Season
150-180 days
Winter Minimum
-10°F to -5°F
(-23.3°C to -20.6°C)
Last Spring Frost
April 25
50% probability
First Fall Frost
October 15
50% probability
AHS Heat Zone 4-7
15 to 30 heat days per year • Low to Moderate heat stress
Typical regions: Denver CO, Central Missouri, Southern Ohio, Coastal Maine
📊 Data Source:
USDA Plant Hardiness Zone Map 2023 • Frost dates from NOAA station USW00094728 • Last verified: 1/22/2026
📊 Zone Compatibility Analysis
💾 Suitability computed by Solara Agricultural Intelligence Platform
📅 Zone 6a Planting Calendar for Tom Thumb
Based on NOAA climate normals for Zone 6a. Dates show 50% probability (average year).
🌱 Start Seeds Indoors
6-8 weeks before April 25
Approximately late winter to early spring
🪴 Transplant Outdoors
After April 25
When soil reaches 60°F+
🌾 Direct Sow (Alternative)
2 weeks after April 25
For warm-season crops
🥕 Expected Harvest
48-58 days after planting
Complete before October 15
💡 Zone 6a Growing Tips
- • Growing season: 150-180 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 6a Challenges
⚠️Variable spring weather
⚠️Occasional late frosts
⚠️Summer heat
✅ Best Plants for Zone 6a
✓Full vegetable garden
✓Most tomatoes
✓Peppers
✓Wide variety of perennials
❄️ Winter in Zone 6a
Moderate winters with lows reaching -5°F to -10°F.
☀️ Summer in Zone 6a
Warm to hot summers with good growing conditions.
🔥 Heat Management for AHS Zone 4-7
This zone experiences 15 to 30 heat days per year with low to moderate heat stress.
🌡️Mulching
🌡️Consistent watering
🌡️Some afternoon shade for sensitive plants
Source: American Horticultural Society
📊 Tom Thumb Quick Facts
Days to Maturity
48-58
Difficulty
beginner
Season
spring
Type
Heirloom
📍 View Tom Thumb Guide for Other Zones
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