Plants
If you’ve ever wondered when to plant onions in Georgia for a bountiful harvest, timing is the game-changer—especially in zones 7b-8b where mild winters and long summers create two perfect planting windows.
Skip the guesswork: fall and spring offer distinct advantages, but one season gives you a head start on flavorful bulbs while the other risks bolting or frost damage.
Georgia’s climate lets you grow 🧅 onions twice a year, but the key lies in aligning your planting with frost dates and variety types. Short-day onions (like ‘Texas Early White’) thrive when sown in late winter to early spring, while fall-planted sets (like ‘Candy’) overwinter for an early summer harvest.
Get this wrong, and you’ll end up with bitter greens instead of sweet bulbs.
I’ll break down the exact frost-free windows for each season, plus soil prep tips to ensure strong starts. Whether you’re a beginner or a seasoned gardener, these strategies will help you avoid common pitfalls—like overcrowding or uneven watering—and maximize your onion yield.
Ready to master the timing? Let’s dive into the best months to plant, how to extend your growing season, and which varieties perform best in Georgia’s heat and humidity. Your harvest starts with the right move.
Georgia’s onion planting calendar by variety type (short-day, intermediate-day, long-day)
Georgia’s USDA zones 7b-8b create perfect conditions for growing onions, but the key to a successful harvest lies in understanding your variety type and frost dates.
The state’s mild winters allow for both fall and spring planting, but each onion type has specific timing needs to prevent bolting or frost damage. Let’s break down the ideal planting windows for short-day, intermediate-day, and long-day onions.
First, know that short-day onions (like ‘Texas Early White’) thrive in Georgia’s climate because they mature before the heat of summer. These should be planted 4-6 weeks before your last frost date—typically late February to early March for spring harvests.
For fall planting, aim for late September to early October to allow bulbs to mature before winter sets in. Intermediate-day onions (e.g., ‘Candy’) need slightly cooler conditions, so plant them 6-8 weeks before last frost or in early September for fall.
Long-day onions (like ‘Sweet Sandwich’) are trickier in Georgia—they’re bred for northern climates and often bolt prematurely in our long days. If you’re determined to grow them, start seeds indoors 10-12 weeks before last frost and transplant as early as February. For fall, try mid-August plantings with protective mulch. Bolting risk increases if planted too late in spring or too early in fall.
Soil temperature is another critical factor. Onions need soil temps between 40-65°F to germinate. In Georgia, this usually aligns with late winter to early spring for spring plantings. For fall, wait until soil cools below 80°F (typically after mid-September) to avoid heat stress. Use a soil thermometer to check—planting too early in warm soil can stunt growth.
Here’s a quick reference for Georgia’s frost dates by region. North Georgia (e.g., Atlanta, USDA 7b) has an average last frost date of March 15, while South Georgia (e.g., Savannah, USDA 8a) can plant until March 22.
Adjust your planting window 1-2 weeks earlier if you’re in a cooler microclimate like the Blue Ridge Mountains.
Now, let’s dive into the exact planting windows for each onion type, including adjustments for Georgia’s fall and spring growing seasons. This comparison table will help you choose the best varieties and timing for your garden.