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Can You Grow Onion in Arizona?

US · USDA Zone 9a · zones 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a

Grows well here

Onions grow well here — plant sets or transplants in early spring for a summer harvest.

Plant zones

2a–9b

Arizona last frost

late January

Arizona first frost

late December

Days to harvest

90–120 days

When to plant Onions in Arizona

Start indoors

Jan 1

Transplant

Jan 20

Harvest

Apr 20 – May 20

Dates are approximate, based on Arizona's average frost dates. Your exact yard may vary by microclimate.

About Onion

Onions are a staple crop that stores well and can be grown as sets transplants or from seed.

Growing from sets is easiest for beginners. Plant in early spring — onions are frost-tolerant. Day-length sensitive — choose short-day long-day or day-neutral varieties based on your latitude.

Full onion growing guide →

Gardening in Arizona

Arizona spans dramatic climate zones from cool mountain forests to hot desert. Low-elevation cities like Phoenix grow year-round; high-elevation areas are Zone 5-6.

See what grows well in Arizona →

Frequently asked questions

Can you grow Onion in Arizona?

Onions grow well here — plant sets or transplants in early spring for a summer harvest.

What zone is Arizona?

Arizona spans USDA Zone 9a (4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a).

When do you plant Onions in Arizona?

Plant Onions around late January (start indoors Jan 1), harvest Apr 20 – May 20.