Can You Grow Florence Fennel in Zone 4a?
Florence Fennel grows well in Zone 4a
Florence fennel grows well here — it likes warm days and cool nights for bulb development.
📅 When to Plant in Zone 4a
Based on Zone 4a's average last frost of late April 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 Florence Fennel in Zone 4a
Direct sow after last frost — fennel dislikes transplanting. Sow 1/4 inch deep, thin to 12 inches. Keep soil consistently moist while bulbing. Harvest when bulbs are 3 inches wide. Do NOT plant near tomatoes or peppers.
🗺️ USDA Plant Hardiness Zones
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 4a
- USDA Zone
- 4a
- Last Frost
- late April
- First Frost
- early October
- Frost-Free Days
- 163
- Florence Fennel Zone Range
- 4a – 9b
- Days to Harvest
- 65–90 days