When to Plant Onion in Thomas County, GA
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.
Thomas County, Georgia is in USDA Zone 8b. The average last spring frost is March 4 and the first fall frost is November 22, giving you a growing season of approximately 263 days.
At an elevation of 302 feet, Thomas County receives approximately 58.3 inches of rainfall annually with predominantly clay loam soil. Summer highs average 95°F, so Onion may need afternoon shade and extra watering during peak heat. Clay soil retains moisture well for Onion, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Onion root diseases.
Thomas County Soil Profile
Soil Type
Clay Loam
Soil pH
5.5-6.5
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
Onion Planting Timeline — Thomas County, GA
Onion Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 28 | Jan 28 – Feb 11 |
| Transplant Outdoors | March 4 | Mar 4 – Mar 18 |
| Direct Sow | February 18 | Feb 18 – Mar 11 |
| Fall Sowing | September 13 | Sep 13 – Sep 27 |
| Harvest | June 3 | Jun 3 – Jul 22 |
Plant 1" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Start Indoors Direct Sow |
| March | Transplant Outdoors Direct Sow |
| April | — |
| May | — |
| June | Harvest |
| July | Harvest |
| August | — |
| 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 8b
Growing Season
263 days
Growing Tips for Thomas 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 Thomas County, GA?
Thomas County is in Zone 8b with an average last frost of March 4. Plan your Onion planting based on this frost date — see the calendar above for exact timing.
What planting zone is Thomas County, GA?
Thomas County, Georgia is in USDA Hardiness Zone 8b. The average last spring frost is March 4 and first fall frost is November 22.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Thomas County gardeners in Zone 8b organize planting dates, track what's growing, and never miss a planting window.
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