When to Plant Onions in Alabama
The backbone of the kitchen garden. Choose short-day, intermediate, or long-day varieties based on your latitude.
The Short Answer
Alabama Frost Dates
Your planting dates depend on which part of Alabama you're in. Here are the frost date ranges by region:
| Region | Zones | Last Frost (Spring) | First Frost (Fall) |
|---|---|---|---|
| Northern Alabama | 7a, 7b | Mar 25 - Apr 10 | Oct 20 - Nov 5 |
| Central Alabama | 7b, 8a | Mar 15 - Apr 1 | Nov 1 - Nov 15 |
| Southern Alabama | 8a, 8b | Feb 28 - Mar 15 | Nov 10 - Nov 25 |
Onions Planting Schedule for Alabama
Northern Alabama (Zones 7a, 7b)
Average last frost: Mar 25 - Apr 10 · Average first frost: Oct 20 - Nov 5
Central Alabama (Zones 7b, 8a)
Average last frost: Mar 15 - Apr 1 · Average first frost: Nov 1 - Nov 15
Southern Alabama (Zones 8a, 8b)
Average last frost: Feb 28 - Mar 15 · Average first frost: Nov 10 - Nov 25
Growing Onions in Alabama
Onions in Alabama's Climate
You straddle the day-length divide. Southern areas need short-day varieties (plant in fall for spring harvest), northern areas can use intermediate-day types. The single most important decision for onion success in your zone is choosing the right day-length type — the wrong one produces scallions instead of bulbs regardless of how well you grow them.
Soil Considerations for Alabama
Red clay soils in north, sandy loam in south. Amend with compost for drainage in clay areas. Loose, well-drained soil is especially important for onions since the edible portion grows underground. If your soil is heavy clay, consider raised beds.
Alabama Climate & Growing Season
Long growing season. Hot, humid summers. Mild winters allow for fall and winter gardening in southern regions. Onions can handle frost well, which is an advantage in Alabama's climate. You can push planting dates earlier in spring and extend into fall.
Growing season length varies across Alabama: Northern Alabama (7a, 7b) has a last frost around Mar 25 - Apr 10, while Southern Alabama (8a, 8b) sees frost end around Feb 28 - Mar 15. This difference matters for onions — but onions handle frost well, so the timing difference is less critical.
Growing Tips
Day length triggers bulbing. Northern gardeners need long-day varieties. Southern gardeners need short-day varieties.
Companion Planting
Plant onions alongside these companions for better growth:
Keep onions away from:
The Bottom Line
Last reviewed: March 29, 2026