When to plant sunflower
Sunflower timing, counted from your average last spring frost and first fall frost.
| Season | warm-season, tender to frost |
|---|---|
| Sow outdoors | from 2 weeks after the last frost |
| Soil temperature to germinate | 50°F or warmer |
| Days to maturity | 70–100 days from seed |
| Spacing | 12–24 in apart, rows 30–36 in apart |
| Seed depth | 1.0 in |
Example dates
| Place | Dates |
|---|---|
| Austin, TX (78701) | Sow outdoors: Mar 10–24 |
| Atlanta, GA (30303) | Sow outdoors: Mar 24–Apr 7 |
| St. Louis, MO (63101) | Sow outdoors: Apr 1–15 |
| Chicago, IL (60614) | Sow outdoors: Apr 10–24 |
| Denver, CO (80202) | Sow outdoors: Apr 30–May 14 |
| Seattle, WA (98101) | Sow outdoors: Mar 13–27 |
Every ZIP page has its own dates. Find your ZIP.
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Sources
- University of Missouri Extension: G6201: Vegetable Planting Calendar
- K-State Research and Extension: MF315: Vegetable Garden Planting Guide
- University of Maryland Extension: When to Plant Vegetables
- NC State Extension: Central North Carolina Planting Calendar for Annual Vegetables, Fruits, and Herbs
- UF/IFAS Extension (EDIS): SP 103/VH021: Florida Vegetable Gardening Guide
- Clemson Cooperative Extension HGIC: Planning a Garden
Summarized in our own words from public extension publications.
All vegetables · Your ZIP's planting calendar
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