Growing Onions in Zone 10B

Onions are a garden staple. Choose the right day-length variety for your latitude for best results.

Zone 10B has a very long growing season with mild winters. Many crops can be grown nearly year-round with successive plantings.

Top Growing Tips

• Short-day varieties for zones 7+ (south), long-day for zones 6 and north
• Start from sets (small bulbs) for easiest results
• Stop watering when tops start to fall over
• Cure in a warm, dry spot for 2-3 weeks before storing
• Day-neutral varieties work in any zone

Companion Planting

Good companions: beets, carrots, lettuce, tomatoes, chamomile

Avoid planting near: beans, peas

Harvest Timeline

90-120 days from sets, 100-175 days from seed

About Zone 10B

USDA Hardiness Zone 10B has an average last spring frost around Jan 15 and first fall frost around Dec 31. All planting dates above are calculated from these frost dates. Your specific location may vary — check with your local extension office for the most accurate dates.