When to plant Onion in Limestone County County,
Spring Onion in Limestone County County goes in March 22–April 12, once nighttime temps stop dipping near freezing. A second sowing from August 20 to September 3 extends the harvest into fall.
When to Plant Onion in Limestone County, AL
Limestone County, Alabama gardeners: here's your June plan
Your garden in Limestone County, Alabama is working on a schedule, even when you're not. Here's where you should be this June.
To set up a strong July, finish these tasks
- First harvests: onion
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.
Limestone County, Alabama is in USDA Zone 8a. The average last spring frost is April 5 and the first fall frost is October 29, giving you a growing season of approximately 207 days.
At an elevation of 200 feet, Limestone County receives approximately 54.7 inches of rainfall annually with predominantly clay loam soil. Summer highs average 93°F, providing good warmth for Onion during the growing season. 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.
Limestone County Soil Profile
Soil Type
Clay Loam
Soil pH
5.5-6.8
Drainage
Well Drained
Onion 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.
Soil Compatibility in Limestone County
How your county's soil matches Onion's growing requirements.
Soil pH
Your soil pH (5.5–6.8) overlaps with Onion's range (6.0–7.0), though not a perfect match.
Soil Texture
The clay loam soil in Limestone County is excellent for Onion — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.5%). Annual compost additions will help Onion.
How to Plant Onion
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Onion Water Budget
Monthly Watering Guide for Onion
Onion needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Onion Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 4.4" | 0" | ❄️ Dormant |
| Feb | — | 4.6" | 0" | ❄️ Dormant |
| Mar | — | 5.4" | 0" | ❄️ Dormant |
| Apr | 4.3" | 4.3" | 0" | ✅ Rainfall sufficient |
| May | 4.3" | 4.6" | 0" | ✅ Rainfall sufficient |
| Jun | 4.3" | 5.2" | 0" | ✅ Rainfall sufficient |
| Jul | 4.3" | 5.8" | 0" | ✅ Rainfall sufficient |
| Aug | 4.3" | 5.4" | 0" | ✅ Rainfall sufficient |
| Sep | 4.3" | 3.6" | 0.7" | 💧 Light watering |
| Oct | 4.3" | 3.4" | 0.9" | 💧 Light watering |
| Nov | — | 4.5" | 0" | ❄️ Dormant |
| Dec | — | 3.7" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Limestone County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Onion Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Onion Planting Timeline — Limestone County, AL
Onion Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 1 | Mar 1 – Mar 15 |
| Transplant Outdoors | April 5 | Apr 5 – Apr 19 |
| Direct Sow | March 22 | Mar 22 – Apr 12 |
| Harvest | July 5 | Jul 5 – Aug 23 |
| Fall Sowing | August 20 | Aug 20 – Sep 3 |
Plant 1" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors Direct Sow |
| April | Transplant Outdoors Direct Sow |
| May | — |
| June | — |
| July | Harvest |
| August | Fall Sowing Harvest |
| September | Fall Sowing |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · Natural rainfall sufficient
📅 Days to Maturity
90–120 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 8a
📆 Growing Season
207 days in Limestone County
Growing Tips for Onion in Limestone County
Direct sow Onion outdoors after April 05 in Limestone County when soil has warmed and frost danger has passed.
With Limestone County's clay soil (32% clay), work in 3-4 inches of compost before planting Onion. Avoid tilling when soil is wet to prevent compaction.
Common pests for Onion in this region include onion maggots and thrips. Use row covers early in the season and inspect plants weekly.
General growing tips
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 Limestone County, AL?
Limestone County is in Zone 8a with an average last frost of April 5. Plan your Onion planting based on this frost date — see the calendar above for exact timing.
What planting zone is Limestone County, AL?
Limestone County, Alabama is in USDA Hardiness Zone 8a. The average last spring frost is April 5 and first fall frost is October 29.
When should I plant Onion in Limestone County, ?
In Limestone County, , plant Onion after the last frost (around April 5) and before the first frost (around October 29). Best results when soil holds above 50°F.
What growing zone is Limestone County, for Onion?
Limestone County sits in USDA Zone 8a. Onion grows reliably in zones 3a through 10b, so it's a good fit here.
Can Onion grow in Limestone County's climate?
Yes — Onion grows well in Limestone County's temperate climate. Limestone County averages a 207-day frost-free season, with last frost around April 5 and first frost around October 29.
Your Limestone County Garden Planner — Free
A 22-page printable planner built for Limestone County (Zone 8a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.