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Onion plant growing in a garden

Photo: Wikimedia Commons

Growing Onion

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

Quick Answer: Onion grows in Zones 2a–9b, taking 90–120 days to harvest.
🌡️ Zones 2a–9b ☀️ Full Sun 💧 Moderate Water 🔧 Intermediate 🪴 Container OK (5+ gal) 🏠 Indoor Viable ❄️ Frost Tolerant ⚠️ Toxic to Pets

Can You Grow Onion in Your Area?

Growing Tips

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.

Where Does Onion Grow?

Onion is suited to Zones 2a–9b. Here are some areas where it thrives:

✅ Zone 2a ✅ Zone 2b ✅ Zone 3a ✅ Zone 3b ✅ Zone 4a ✅ Zone 4b ✅ Zone 5a ✅ Zone 5b ✅ Zone 6a ✅ Zone 6b ✅ Zone 7a ✅ Zone 7b
Won't grow outdoors in: very cold zones (below Zone 2a) or very warm zones (above Zone 9b). Onions struggle in very short-season zones but can still produce green onions for harvest.

Frequently Asked Questions

Onion grows in USDA Zones 2a–9b.
Onion needs moderate care.
Yes — use a 5+ gallon pot.
Onion is TOXIC for dogs and TOXIC for cats.