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🌻 Growing Sunflower in Zone 1a
Zone 1a has harsh winters and a short growing season. Start Sunflower early indoors to maximize your harvest window. Last frost: May 25. First frost: Aug 28.
Planting Calendar
Season: May 25 – Aug 28 (95 days)
When to Plant Sunflower in Zone 1a
Start Seeds Indoors: May 4
Start Sunflower seeds indoors around May 4 (3 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.
Transplant Outdoors: Jun 1
Transplant Sunflower seedlings outdoors after Jun 1. Wait until soil temperature reaches 55°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.
Harvest: Aug 5
First harvest approximately Aug 5 (~65 days from transplant). Continue harvesting until first frost (Aug 28).
Companion Planting
Sunflower in Other Zones
1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13bFrequently Asked Questions
When should I plant Sunflower in Zone 1a?
Start Sunflower seeds indoors around May 4. Transplant outdoors after Jun 1. Expect first harvest around Aug 5.
What is the last frost date for Zone 1a?
The average last spring frost date for Zone 1a is May 25. The first fall frost averages Aug 28, giving a 95-day growing season.
Can I grow Sunflower in Zone 1a?
Yes. Sunflower needs 90 days to harvest. Zone 1a has a 95-day growing season, which is sufficient.
What is the best month to plant Sunflower in Zone 1a?
The best time to start Sunflower in Zone 1a is May. Begin seeds indoors around May 4, then transplant outdoors after the last frost date of May 25.
What companion plants grow well with Sunflower?
Good companion plants for Sunflower include Cucumbers, Squash, Corn, Beans. Avoid planting Sunflower near Potatoes.
How long does Sunflower take to harvest?
Sunflower takes approximately 90 days from planting to harvest. In Zone 1a, expect your first harvest around Aug 5.
Plan Your Sunflower Garden
Track Sunflower from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
Start Free Sunflower Growing Guide