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Can You Grow Onion in Washington?
US · USDA Zone 8b · zones 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
Onions grow well here — plant sets or transplants in early spring for a summer harvest.
Plant zones
Washington last frost
Washington first frost
Days to harvest
When to plant Onions in Washington
Start indoors
Transplant
Harvest
Dates are approximate, based on Washington'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.
Gardening in Washington
Washington has dramatically different climates. The wet maritime west (Zone 8a-8b) is mild and productive year-round. Eastern Washington is semi-arid and colder (Zone 5-6) with hot dry summers.
Frequently asked questions
Can you grow Onion in Washington?
Onions grow well here — plant sets or transplants in early spring for a summer harvest.
What zone is Washington?
Washington spans USDA Zone 8b (4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b).
When do you plant Onions in Washington?
Plant Onions around late January (start indoors Jan 1), harvest Apr 30 – May 30.