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Growing Yellow Sweet Spanish in Zone 8b

Allium cepa

✓ Well Suited for Zone 8b
Score: 100/100

🌡️ USDA Hardiness Zone 8b

Mild/Subtropical Transition

USDA 2023 Verified
Growing Season
230-260 days
Winter Minimum
15°F to 20°F
(-9.4°C to -6.7°C)
Last Spring Frost
March 16
50% probability
First Fall Frost
November 21
50% probability
AHS Heat Zone 6-10
46 to 60 heat days per year • Moderate heat stress

Typical regions: Portland OR, Coastal South Carolina, Central Texas

📊 Data Source:
USDA Plant Hardiness Zone Map 2023 • Frost dates from NOAA station USW00024229 • Last verified: 1/22/2026

✓ Zone Compatibility Analysis

high confidence

Excellent match: 105 days to maturity with 155 days buffer in 260-day season.

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

💾 Suitability computed by Solara Agricultural Intelligence Platform

📅 Zone 8b Planting Calendar for Yellow Sweet Spanish

Based on NOAA climate normals for Zone 8b. 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 March 16
For warm-season crops
🥕 Expected Harvest
August 13
Complete before November 21

💡 Zone 8b Growing Tips

  • • Growing season: 230-260 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 8b Challenges

⚠️Summer heat
⚠️Occasional freezes
⚠️Drought in some areas

✅ Best Plants for Zone 8b

✓Year-round vegetables
✓Hardy citrus
✓Palms with protection

❄️ Winter in Zone 8b

Mild winters with rare freezes to 15°F-20°F.

☀️ Summer in Zone 8b

Hot summers with very long growing season.

🔥 Heat Management for AHS Zone 6-10

This zone experiences 46 to 60 heat days per year with moderate heat stress.

🌡️Heavy mulching
🌡️Consistent irrigation
🌡️Shade cloth for sensitive crops

Source: American Horticultural Society

📊 Yellow Sweet Spanish Quick Facts

Days to Maturity
90-120
Difficulty
intermediate
Season
summer
Type
OP

📍 View Yellow Sweet Spanish 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 8b

Yellow Sweet Spanish
110-120 days
Yellow Sweet Spanish
110-120 days
Yellow Sweet Spanish
110-120 days
Yellow Sweet Spanish
110-120 days

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