Can You Grow Onion in Canadian Zone 4?
Onion grows well in Canadian Zone 4
Onions grow well here — plant sets or transplants in early spring for a summer harvest.
📅 When to Plant in Canadian Zone 4
Based on Canadian Zone 4's average last frost of early May and first frost of early October — frost can arrive earlier or later in any given year, so check your local forecast before you transplant.
🌱 Growing Onion in Canadian Zone 4
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.
🗺️ Canadian Plant Hardiness Zones
Canadian Plant Hardiness Zone Map (2014) — Agriculture & Agri-Food Canada / Canadian Forest Service
Canadian zones run 0–9 (coldest to warmest) — a separate system from USDA zones. Browse all Canadian zones →
Technical climate details for Canadian Zone 4
- USDA Zone
- 4
- Last Frost
- early May
- First Frost
- early October
- Frost-Free Days
- 152
- Onion Zone Range
- 2a – 9b
- Days to Harvest
- 90–120 days