Growing Sunflowers in Zone 1
When to plant and harvest sunflowers in Zone 1— based on your zone's frost dates.
Zone 1 sits just outside sunflowers' ideal range (Zones 2–11), but a good harvest is achievable with careful timing and a little season extension.
Sunflowers planting calendar for Zone 1
These months are derived from Zone 1's frost dates — last frost around Late May – mid June, first frost around Late July – mid August.
Start indoors
—
Sow outdoors
June
Transplant
—
Harvest
—
Sunflowers care at a glance
- Sunlight
- Full sun (6+ hours)
- Water
- Moderate; deep but infrequent once established
- Spacing
- 6–18 in apart by variety
- Days to maturity
- 70–100 days
- Best zones
- 2–11
Growing sunflowers in Zone 1: FAQs
Can you grow sunflowers in Zone 1?＋
Zone 1 sits just outside sunflowers' ideal range (Zones 2–11), but a good harvest is achievable with careful timing and a little season extension.
When should I plant sunflowers in Zone 1?＋
In Zone 1, sow outdoors around June. Zone 1's last spring frost is typically Late May – mid June and its first fall frost around Late July – mid August, which sets the planting window.
When to harvest sunflowers in Zone 1?＋
Harvest timing depends on your planting date and variety — sunflowers typically matures in 70–100 days. See the full guide for harvest cues.
Full Sunflowers guide →
Complete care, problems, companions, and harvest tips.
Zone 1 overview →
Frost dates, climate, and everything to grow here.
June in Zone 1 →
What to sow, transplant, and harvest this month.