Local Growing Guide
Grow Bulb Onions in San Diego, CA
Your local guide to growing bulb onions in San Diego — zone-specific timing, local tips, and care advice.
Fall-Spring
📍 San Diego
🌡️ Zone 10a
Days to Harvest
90–120
Spacing
4–6"
Method
Transplant
Season
Fall-Spring
When to Plant Bulb Onions in San Diego
San Diego sits in USDA Zone 10a. Here are your local planting windows.
Start Indoors
Aug – Sept
Transplant Outdoors
Oct – Jan
Growing Bulb Onions in San Diego
📋 Key Timing
Use short-day varieties in zone 10. Plant in fall for late spring harvest. Needs consistent water.
Start your bulb onions seeds indoors during Aug – Sept. Move seedlings to the garden between Oct – Jan.
Watch for These Pests in San Diego
thrips
onion maggots
Frequently Asked Questions
Can I grow Bulb Onions in San Diego?
Yes! Bulb Onions grows well in San Diego's Zone 10a climate. Use short-day varieties in zone 10. Plant in fall for late spring harvest. Needs consistent water.
When to plant Bulb Onions in San Diego?
Transplant bulb onions outdoors between Oct – Jan for best results in San Diego.
Do Bulb Onions need shade in San Diego?
Bulb Onions generally handle San Diego's climate well without shade cloth, though afternoon shade can help during heat waves.
More Growing Guides
Full Bulb Onions growing guide · Zone 10 planting dates · All plants for San Diego