When to Plant Microgreens in USDA Zone 12a
Microgreens are young seedlings of vegetables and herbs harvested at the cotyledon or first true leaf stage. They pack concentrated flavors and nutrients in a tiny package.
In Zone 12a, the average last spring frost is around January 1 and the first fall frost is around December 31, giving you a growing season of approximately 364 days.
Microgreens Planting Timeline — Zone 12a
Where Is USDA Zone 12a?
The map below highlights the states that contain Zone 12a. Click any state to see the Microgreens planting schedule for that location.
Microgreens Planting Calendar — Zone 12a
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 4 | Dec 4 – Dec 18 |
| Transplant Outdoors | January 1 | Jan 1 – Jan 15 |
| Direct Sow | December 11 | Dec 11 – Jan 1 |
| Harvest | January 8 | Jan 8 – Feb 5 |
| Fall Sowing | November 5 | Nov 5 – Nov 19 |
Plant 0.5" deep · 2" apart · Rows 6" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Transplant Outdoors Direct Sow Harvest |
| February | Harvest |
| March | — |
| April | — |
| May | — |
| June | — |
| July | — |
| August | — |
| September | — |
| October | — |
| November | Fall Sowing |
| December | Start Indoors Direct Sow |
Free Zone 12a Planting Calendar PDF
Know exactly when to plant every crop in your zone. Get a printable month-by-month calendar customized for Zone 12a with start dates, transplant windows, and harvest times.
Growing Conditions
Sun
Partial Shade (3-6 hours)
💧 Water
Moderate — regular watering
Days to Maturity
7–21 days
Soil pH
6 – 7
Zone Temperature Range
50°F to 55°F average annual minimum
Growing Season
364 days (Zone 12a average)
Planting Specifications
| Planting Depth | 0.5 inches |
| Plant Spacing | 2 inches apart |
| Row Spacing | 6 inches between rows |
Succession Planting Microgreens in Zone 12a
Sow every 0.7 weeks for continuous harvest throughout the season.
Growing Tips for Microgreens in Zone 12a
Zone 12a offers a long growing season (~364 days). You can plant Microgreens earlier and may get multiple harvests.
Sow seeds densely on shallow trays of moist growing medium. Cover until germination, then provide light. Harvest with scissors when 1-3 inches tall. Grow year-round indoors.
Saving Microgreens Seeds
Recommended for Your Garden
Reduce heat stress and sun scorch in hot climates with UV-stabilized shade cloth.
Start seeds indoors with reusable cell trays and humidity domes.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Microgreens in Other Zones
Microgreens by State
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Frequently Asked Questions
When should I plant Microgreens in Zone 12a?
In Zone 12a, plan your Microgreens planting around the average last frost date of January 1. Start seeds indoors around December 4. Direct sow outdoors around December 11. Transplant seedlings around January 1.
Can Microgreens grow in Zone 12a?
Yes, Microgreens can grow well in Zone 12a, hardy in USDA zones 1a through 13b. Zone 12a has a growing season of approximately 364 days, which is sufficient for Microgreens (7-21 days to maturity).
When can I harvest Microgreens in Zone 12a?
In Zone 12a, expect to harvest Microgreens from January 8 – February 5. Microgreens takes 7-21 days from planting to harvest.
What is the last frost date for Zone 12a?
The average last spring frost in Zone 12a is around January 1, and the first fall frost is around December 31. This gives a growing season of approximately 364 days. These are 50% probability dates — actual frost dates vary year to year.
Plan Your Garden with Confidence
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