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Can You Grow Onion in Montana?
US · USDA Zone 4b · zones 3a, 3b, 4a, 4b, 5a, 5b
Onions grow well here — plant sets or transplants in early spring for a summer harvest.
Plant zones
Montana last frost
Montana first frost
Days to harvest
When to plant Onions in Montana
Start indoors
Transplant
Harvest
Dates are approximate, based on Montana'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 Montana
Montana has a semi-arid continental climate with cold winters and warm summers. Most of the state is Zone 4-5; protected valleys are Zone 5-6. Short but intense growing seasons.
Frequently asked questions
Can you grow Onion in Montana?
Onions grow well here — plant sets or transplants in early spring for a summer harvest.
What zone is Montana?
Montana spans USDA Zone 4b (3a, 3b, 4a, 4b, 5a, 5b).
When do you plant Onions in Montana?
Plant Onions around mid-April (start indoors Feb 17), harvest Jul 14 – Aug 13.