When to plant Onion in Grant County, KY
Grant County's climate puts the Onion spring window between April 1 and April 22. time plantings around the expected last-frost window for best survival. A second sowing from August 17 to August 31 extends the harvest into fall.
When to Plant Onion in Grant County, KY
Onions are a fundamental kitchen staple available in yellow, white, and red varieties. Choose long-day, short-day, or intermediate types based on your latitude.
Grant County, Kentucky is in USDA Zone 6b. The average last spring frost is April 15 and the first fall frost is October 26, giving you a growing season of approximately 194 days.
At an elevation of 2,483 feet, Grant County receives approximately 46.6 inches of rainfall annually with predominantly silt loam soil. Summer highs average 86°F, providing good warmth for Onion during the growing season.
Grant County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Onion Planting Timeline — Grant County, KY
Onion Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 11 | Mar 11 – Mar 25 |
| Transplant Outdoors | April 15 | Apr 15 – Apr 29 |
| Direct Sow | April 1 | Apr 1 – Apr 22 |
| Harvest | July 15 | Jul 15 – Sep 2 |
| Fall Sowing | August 17 | Aug 17 – Aug 31 |
Plant 1" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Transplant Outdoors Direct Sow |
| May | — |
| June | — |
| July | Harvest |
| August | Fall Sowing Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
90–120 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 6b
📆 Growing Season
194 days in Grant County
Growing Tips for Grant County
Start seeds indoors 8-10 weeks before transplanting. Match day-length type to your latitude. Stop watering when tops begin to fall over and cure bulbs for 2-3 weeks before storage.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Onion in Other Locations
Frequently Asked Questions
When should I plant Onion in Grant County, KY?
Grant County is in Zone 6b with an average last frost of April 15. Plan your Onion planting based on this frost date — see the calendar above for exact timing.
What planting zone is Grant County, KY?
Grant County, Kentucky is in USDA Hardiness Zone 6b. The average last spring frost is April 15 and first fall frost is October 26.
When should I plant Onion in Grant County, KY?
In Grant County, KY, plant Onion after the last frost (around April 15) and before the first frost (around October 26). Best results when soil holds above 50°F.
What growing zone is Grant County, KY for Onion?
Grant County sits in USDA Zone 6b. Onion grows reliably in zones 3a through 10b, so it's a good fit here.
Can Onion grow in Grant County's climate?
Yes — Onion grows well in Grant County's temperate climate. Grant County averages a 194-day frost-free season, with last frost around April 15 and first frost around October 26.
Your Grant County Garden Planner — Free
A 22-page printable planner built for Grant County (Zone 6b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.