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Growing Tokyo Long White in Zone 3a

Allium cepa

✓ Well Suited for Zone 3a
Score: 98/100

🌡️ USDA Hardiness Zone 3a

Cold Continental

USDA 2023 Verified
Growing Season
90-120 days
Winter Minimum
-40°F to -35°F
(-40.0°C to -37.2°C)
Last Spring Frost
May 20
50% probability
First Fall Frost
September 12
50% probability
AHS Heat Zone 1-3
Less than 1 heat day per year • Minimal heat stress

Typical regions: Northern Minnesota, Northern Wisconsin, Montana mountains, Fairbanks AK

📊 Data Source:
USDA Plant Hardiness Zone Map 2023 • Frost dates from NOAA station USW00026411 • Last verified: 1/22/2026

✓ Zone Compatibility Analysis

high confidence

Excellent match: 70 days to maturity with 50 days buffer in 120-day season.

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

💾 Suitability computed by Solara Agricultural Intelligence Platform

📅 Zone 3a Planting Calendar for Tokyo Long White

Based on NOAA climate normals for Zone 3a. 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 May 20
For warm-season crops
🥕 Expected Harvest
July 9
Complete before September 12

💡 Zone 3a Growing Tips

  • • Growing season: 90-120 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 3a Challenges

⚠️Very cold winters
⚠️Short growing season
⚠️Late spring frosts

✅ Best Plants for Zone 3a

✓Hardy perennials
✓Root vegetables
✓Cold-tolerant fruit trees

❄️ Winter in Zone 3a

Very cold winters with temperatures occasionally reaching -40°F.

☀️ Summer in Zone 3a

Moderate summers with adequate growing conditions for hardy crops.

🔥 Heat Management for AHS Zone 1-3

This zone experiences less than 1 heat day per year with minimal heat stress.

🌡️No heat protection needed
🌡️Focus on cold hardiness

Source: American Horticultural Society

📊 Tokyo Long White Quick Facts

Days to Maturity
60-80
Difficulty
intermediate
Season
summer
Type
OP

📍 View Tokyo Long White Guide for Other Zones

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

🌱 Other Onion Varieties for Zone 3a

Tokyo Long White
65-75 days
Tokyo Long White
65-75 days
Tokyo Long White
65-75 days
Tokyo Long White
65-75 days

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