Can You Grow Bok Choy in Zone 4b?
Quick Answer:
✅ Yes — Bok choy grows reliably in your zone — it loves cool weather and handles light frosts.
✅ Yes
Bok Choy grows well in Zone 4b
Bok choy grows reliably in your zone — it loves cool weather and handles light frosts.
📅 When to Plant in Zone 4b
Start Indoors
Mar 18
Transplant Out
Apr 15
Last Sow Date
Aug 16
🌾 Harvest
May 30 – Jun 14
Based on Zone 4b's average last frost of mid-April and first frost of mid-October.
🌱 Growing Bok Choy in Zone 4b
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
🗺️ USDA Plant Hardiness Zones
Zone 4 is shown in
this colour
on the map below
2023 USDA Plant Hardiness Zone Map — public domain. USDA Agricultural Research Service
USDA zones run 1a–13b (26 half-zones). Each full zone above covers both the a and b half-zones. Browse all US zones →
Technical climate details for Zone 4b
- USDA Zone
- 4b
- Last Frost
- mid-April
- First Frost
- mid-October
- Frost-Free Days
- 183
- 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.
Zone 4b is in USDA Hardiness Zone 4b with approximately 183 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.