When to Plant Onion in Anne Arundel County, MD
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.
Anne Arundel County, Maryland is in USDA Zone 7a. The average last spring frost is April 3 and the first fall frost is November 3, giving you a growing season of approximately 214 days.
At an elevation of 435 feet, Anne Arundel County receives approximately 41 inches of rainfall annually with predominantly silt loam soil. Summer highs average 93°F, providing good warmth for Onion during the growing season.
Anne Arundel County Soil Profile
Soil Type
Silt Loam
Soil pH
5.7-6.5
Drainage
Well Drained
Onion Planting Timeline — Anne Arundel County, MD
Onion Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 27 | Feb 27 – Mar 13 |
| Transplant Outdoors | April 3 | Apr 3 – Apr 17 |
| Direct Sow | March 20 | Mar 20 – Apr 10 |
| Fall Sowing | August 25 | Aug 25 – Sep 8 |
| Harvest | July 3 | Jul 3 – Aug 21 |
Plant 1" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors |
| 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
Moderate — regular watering
Days to Maturity
90–120 days
Soil pH
6 – 7
USDA Zone
Zone 7a
Growing Season
214 days
Growing Tips for Anne Arundel 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 Anne Arundel County, MD?
Anne Arundel County is in Zone 7a with an average last frost of April 3. Plan your Onion planting based on this frost date — see the calendar above for exact timing.
What planting zone is Anne Arundel County, MD?
Anne Arundel County, Maryland is in USDA Hardiness Zone 7a. The average last spring frost is April 3 and first fall frost is November 3.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Anne Arundel County gardeners in Zone 7a organize planting dates, track what's growing, and never miss a planting window.
Get Your Free Garden Planner →Free download. Plan your entire garden season in minutes.