✓
Growing Purple Top White Globe in Zone 3b
Brassica rapa
✓ Well Suited for Zone 3b
Score: 100/100
🌡️ USDA Hardiness Zone 3b
Cold Continental
USDA 2023 Verified
Growing Season
100-130 days
Winter Minimum
-35°F to -30°F
(-37.2°C to -34.4°C)
AHS Heat Zone 1-4
Less than 1 heat day per year • Minimal heat stress
Typical regions: Northern Great Plains, Upper Midwest, Northern New England mountains
📊 Data Source:
USDA Plant Hardiness Zone Map 2023 • Last verified: 1/22/2026
✓ Zone Compatibility Analysis
high confidenceExcellent match: 47 days to maturity with 83 days buffer in 130-day season.
Recommendation: Direct sowing and transplanting both viable. Excellent fit for this zone.
💾 Suitability computed by Solara Agricultural Intelligence Platform
📅 Zone 3b Planting Calendar for Purple Top White Globe
🌱 Start Seeds Indoors
March 12
✓ Database-computed optimal date
🪴 Transplant Outdoors
April 30
✓ Database-computed optimal date
🌾 Direct Sow (Alternative)
2 weeks after last frost
For warm-season crops
🥕 Expected Harvest
June 16
💡 Zone 3b Growing Tips
- • Growing season: 100-130 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 3b Challenges
⚠️Cold winters
⚠️Variable spring weather
⚠️Wind exposure
✅ Best Plants for Zone 3b
✓Hardy vegetables
✓Apples
✓Cherries
✓Lilacs
✓Hostas
❄️ Winter in Zone 3b
Cold winters with temperatures reaching -30°F to -35°F.
☀️ Summer in Zone 3b
Warm summers suitable for most cool-season crops.
🔥 Heat Management for AHS Zone 1-4
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
📊 Purple Top White Globe Quick Facts
Days to Maturity
35-60
Difficulty
intermediate
Season
summer
Type
OP
📍 View Purple Top White Globe Guide for Other Zones
Free Zone 3b Planting Calendar
Get Purple Top White Globe planting dates, frost alerts, and succession timing for your zone — delivered to your inbox.
Get Personalized Purple Top White Globe Planting Dates
Enter your exact location for custom frost dates, planting windows, and harvest predictions tailored to your microclimate.
Try Solara Free →