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Growing Growth Stage Duration in Zone 4b

Lactuca sativa

✓ Well Suited for Zone 4b

Score: 100/100

🌡️ USDA Hardiness Zone 4b

Cold Continental

USDA 2023 Verified

Growing Season

120-150 days

Winter Minimum

-25°F to -20°F

(-31.7°C to -28.9°C)

Last Spring Frost

April 25

50% probability

First Fall Frost

October 17

50% probability

AHS Heat Zone 2-6

1 to 7 heat days per year • Very Low heat stress

Typical regions: Upper Midwest, Northern New England, High elevation areas, Minneapolis MN

📊 Data Source:

USDA Plant Hardiness Zone Map 2023 • Frost dates from NOAA station USW00014820 • Last verified: 1/22/2026

✓ Zone Compatibility Analysis

high confidence

Excellent match: 4 days to maturity with 146 days buffer in 150-day season.

Recommendation: Direct sowing and transplanting both viable. Excellent fit for this zone.

💾 Suitability computed by Solara Agricultural Intelligence Platform

📅 Zone 4b Planting Calendar for Growth Stage Duration

Based on NOAA climate normals for Zone 4b. Dates show 50% probability (average year).

🌱 Start Seeds Indoors

March 12

✓ Database-computed optimal date

🪴 Transplant Outdoors

April 30

✓ Database-computed optimal date

🌾 Direct Sow (Alternative)

2 weeks after April 25

For warm-season crops

🥕 Expected Harvest

May 4

Complete before October 17

💡 Zone 4b Growing Tips

• Growing season: 120-150 frost-free days
• Excellent match for this zone - both direct sowing and transplanting work well
• Monitor soil temperature before transplanting (minimum 55-60°F for most crops)

⚠️ Zone 4b Challenges

⚠️Cold winters

⚠️Variable spring weather

⚠️Occasional late frosts

✅ Best Plants for Zone 4b

✓Full vegetable garden

✓Fruit trees

✓Ornamental shrubs

✓Perennials

❄️ Winter in Zone 4b

Cold winters with lows reaching -20°F to -25°F.

☀️ Summer in Zone 4b

Warm summers suitable for most garden vegetables.

🔥 Heat Management for AHS Zone 2-6

This zone experiences 1 to 7 heat days per year with very low heat stress.

🌡️Minimal heat protection

🌡️Focus on cold hardiness

Source: American Horticultural Society

📊 Growth Stage Duration Quick Facts

Days to Maturity

2-7

Difficulty

intermediate

Season

summer

Type

📍 View Growth Stage Duration Guide for Other Zones

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

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