Can You Grow Sunflower in Zone 6b?
Quick Answer:
✅ Yes — Sunflowers grow brilliantly here — they love the warm season and produce quickly.
✅ Yes
Sunflower grows well in Zone 6b
Sunflowers grow brilliantly here — they love the warm season and produce quickly.
📅 When to Plant in Zone 6b
Direct Sow
Mar 15
Last Sow Date
Aug 27
🌾 Harvest
May 14 – Jun 3
Based on Zone 6b's average last frost of mid-March and first frost of mid-November.
🌱 Growing Sunflower in Zone 6b
Direct sow after last frost in the sunniest spot available. No transplanting needed. Giant varieties need staking. Harvest seed heads when the back turns brown and seeds are firm.
🪴 Container: 5+ gal pot
🗺️ USDA Plant Hardiness Zones
Zone 6 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 6b
- USDA Zone
- 6b
- Last Frost
- mid-March
- First Frost
- mid-November
- Frost-Free Days
- 244
- Sunflower Zone Range
- 2a – 11b
- Days to Harvest
- 60–80 days
Frequently Asked Questions
Sunflowers grow brilliantly here — they love the warm season and produce quickly.
Zone 6b is in USDA Hardiness Zone 6b with approximately 244 frost-free days per year.
Sunflower grows in USDA Zones 2a–11b.
Sunflower is beginner-friendly and one of the easier crops to grow.