When to Plant Onion in McCracken 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.
McCracken County, Kentucky is in USDA Zone 6b. The average last spring frost is March 30 and the first fall frost is October 30, giving you a growing season of approximately 214 days.
At an elevation of 1,445 feet, McCracken County receives approximately 48 inches of rainfall annually with predominantly silt loam soil. Summer highs average 86°F, providing good warmth for Onion during the growing season.
McCracken County Soil Profile
Soil Type
Silt Loam
Soil pH
5.3-6.6
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
Onion Planting Timeline — McCracken County, KY
Onion Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 23 | Feb 23 – Mar 9 |
| Transplant Outdoors | March 30 | Mar 30 – Apr 13 |
| Direct Sow | March 16 | Mar 16 – Apr 6 |
| Fall Sowing | August 21 | Aug 21 – Sep 4 |
| Harvest | June 29 | Jun 29 – Aug 17 |
Plant 1" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors |
| March | Start Indoors Transplant Outdoors Direct Sow |
| April | Transplant Outdoors Direct Sow |
| May | — |
| June | Harvest |
| July | Harvest |
| August | Fall Sowing Harvest |
| September | Fall Sowing |
| October | — |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Moderate — regular watering
Days to Maturity
90–120 days
Soil pH
6 – 7
USDA Zone
Zone 6b
Growing Season
214 days
Growing Tips for McCracken 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
Level Up Your Garden
Onion in Other Locations
Frequently Asked Questions
When should I plant Onion in McCracken County, KY?
McCracken County is in Zone 6b with an average last frost of March 30. Plan your Onion planting based on this frost date — see the calendar above for exact timing.
What planting zone is McCracken County, KY?
McCracken County, Kentucky is in USDA Hardiness Zone 6b. The average last spring frost is March 30 and first fall frost is October 30.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help McCracken County gardeners in Zone 6b organize planting dates, track what's growing, and never miss a planting window.
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