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Growing Evergreen Hardy White in Zone 6a

Allium cepa

✓ Well Suited for Zone 6a

Score: 100/100

🌡️ 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

high confidence

Excellent match: 70 days to maturity with 110 days buffer in 180-day season.

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

💾 Suitability computed by Solara Agricultural Intelligence Platform

📅 Zone 6a Planting Calendar for Evergreen Hardy White

Based on NOAA climate normals for Zone 6a. 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

July 9

Complete before October 15

💡 Zone 6a Growing Tips

• Growing season: 150-180 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 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

📊 Evergreen Hardy White Quick Facts

Days to Maturity

60-80

Difficulty

intermediate

Season

summer

Type

📍 View Evergreen Hardy White 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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