When to Plant Onion in St. Francis County, AR
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.
St. Francis County, Arkansas is in USDA Zone 7b. The average last spring frost is March 20 and the first fall frost is November 9, giving you a growing season of approximately 234 days.
At an elevation of 1,429 feet, St. Francis County receives approximately 51.2 inches of rainfall annually with predominantly silt loam soil. Summer highs average 88°F, providing good warmth for Onion during the growing season. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Onion root diseases.
St. Francis County Soil Profile
Soil Type
Silt Loam
Soil pH
5.5-6.7
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 — St. Francis County, AR
Onion Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 13 | Feb 13 – Feb 27 |
| Transplant Outdoors | March 20 | Mar 20 – Apr 3 |
| Direct Sow | March 6 | Mar 6 – Mar 27 |
| Fall Sowing | August 31 | Aug 31 – Sep 14 |
| Harvest | June 19 | Jun 19 – Aug 7 |
Plant 1" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors |
| March | Transplant Outdoors Direct Sow |
| April | Transplant Outdoors |
| 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 7b
Growing Season
234 days
Growing Tips for St. Francis 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 St. Francis County, AR?
St. Francis County is in Zone 7b with an average last frost of March 20. Plan your Onion planting based on this frost date — see the calendar above for exact timing.
What planting zone is St. Francis County, AR?
St. Francis County, Arkansas is in USDA Hardiness Zone 7b. The average last spring frost is March 20 and first fall frost is November 9.
Plan Your Garden with Confidence
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