When to Plant Sunflower in Boyd County, KY
Sunflowers are tall, cheerful annuals grown for their edible seeds and as pollinator magnets. They come in sizes from 2-foot dwarfs to 12-foot giants.
Boyd County, Kentucky is in USDA Zone 6b. The average last spring frost is April 20 and the first fall frost is October 23, giving you a growing season of approximately 186 days.
At an elevation of 2,124 feet, Boyd County receives approximately 46.2 inches of rainfall annually with predominantly silt loam soil. Summer highs average 91°F, providing good warmth for Sunflower during the growing season.
Boyd County Soil Profile
Soil Type
Silt Loam
Soil pH
5.3-6.5
Drainage
Well Drained
Plant Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Plant Water Budget
Sunflower Planting Timeline — Boyd County, KY
Sunflower Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 23 | Feb 23 – Mar 9 |
| Transplant Outdoors | May 4 | May 4 – May 18 |
| Direct Sow | April 27 | Apr 27 – May 18 |
| Harvest | July 13 | Jul 13 – Aug 31 |
Plant 1" deep · 18" apart · Rows 30" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors |
| March | Start Indoors |
| April | Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | — |
| July | Harvest |
| August | Harvest |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Low — drought tolerant
Days to Maturity
70–100 days
Soil pH
6 – 7.5
USDA Zone
Zone 6b
Growing Season
186 days
Growing Tips for Boyd County
Direct sow after last frost. Stake tall varieties in windy areas. Harvest seed heads when the back turns brown and seeds are plump. Dry heads upside down.
Companion Planting
Good Companions
Avoid Planting Near
Level Up Your Garden
Sunflower in Other Locations
Frequently Asked Questions
When should I plant Sunflower in Boyd County, KY?
Boyd County is in Zone 6b with an average last frost of April 20. Plan your Sunflower planting based on this frost date — see the calendar above for exact timing.
What planting zone is Boyd County, KY?
Boyd County, Kentucky is in USDA Hardiness Zone 6b. The average last spring frost is April 20 and first fall frost is October 23.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Boyd County gardeners in Zone 6b organize planting dates, track what's growing, and never miss a planting window.
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