Can You Grow Onion in Idaho?
US · USDA Zone 6b · zones 3b, 4a, 4b, 5a, 5b, 6a, 6b
Onions grow well here — plant sets or transplants in early spring for a summer harvest.
Plant zones
Idaho last frost
Idaho first frost
Days to harvest
When to plant Onions in Idaho
Start indoors
Transplant
Harvest
Dates are approximate, based on Idaho'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 Idaho
Idaho has a semi-arid continental climate. Southern valleys are Zone 6-7 with hot dry summers; northern regions and mountains are colder. Excellent for root vegetables and cool crops.
Frequently asked questions
Can you grow Onion in Idaho?
Onions grow well here — plant sets or transplants in early spring for a summer harvest.
What zone is Idaho?
Idaho spans USDA Zone 6b (3b, 4a, 4b, 5a, 5b, 6a, 6b).
When do you plant Onions in Idaho?
Plant Onions around mid-March (start indoors Jan 17), harvest Jun 13 – Jul 13.