Can You Grow Bok Choy in Canadian Zone 4?
Quick Answer:
✅ Yes — Bok choy grows reliably in your zone — it loves cool weather and handles light frosts.
✅ Yes
Bok Choy grows well in Canadian Zone 4
Bok choy grows reliably in your zone — it loves cool weather and handles light frosts.
📅 When to Plant in Canadian Zone 4
Start Indoors
Apr 3
Transplant Out
May 1
Last Sow Date
Aug 2
🌾 Harvest
Jun 15 – Jun 30
Based on Canadian Zone 4's average last frost of early May and first frost of early October.
🌱 Growing Bok Choy in Canadian Zone 4
Start indoors 4-6 weeks before last frost or direct sow in fall. Harvest outer leaves continuously or cut the whole head at 2 inches above soil for regrowth. Keep moist — dry conditions trigger bolting.
🪴 Container: 5+ gal pot🏠 Indoor Viable💧 Hydroponic OK❄️ Frost Tolerant
🗺️ Canadian Plant Hardiness Zones
Zone 4 is shown in
this colour
on the map below
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
- Bok Choy Zone Range
- 4a – 9b
- Days to Harvest
- 45–60 days
Frequently Asked Questions
Bok choy grows reliably in your zone — it loves cool weather and handles light frosts.
Canadian Zone 4 is in USDA Hardiness Zone 4 with approximately 152 frost-free days per year.
Bok Choy grows in USDA Zones 4a–9b.
Bok Choy is beginner-friendly and one of the easier crops to grow.