When to plant cauliflower in USDA Zone 9a

Plan your cauliflower planting around local frost risk and soil temperature, then work backward from the harvest week your buyers need. The calendar below is a starting point, not a field-level weather forecast.

Gainesville FL, Houston, New Orleans, southern GA coast. Average last spring frost February 25, first fall frost December 1 — a 279-day frost-free season.

Zone fit: good
Cool-season crops bolt fast under Zone 9a heat. Prioritize the fall planting window and use shade cloth for any spring succession.

Key dates

Start seeds indoors
January 7 – January 21
Transplant outdoors
January 28 – February 18
Expected first harvest
April 15 – May 13
Fall planting window
September 1 – September 22
Fall harvest window
November 17 – December 15

Windows are calculated from your zone's average frost dates. Adjust ±1 week for microclimates, elevation, and your own frost records.

Spacing and soil

Plant spacing
18″
Row spacing
30″
Seed depth
0.25″
Soil temperature
55–75°F
Frost tolerance
half-hardy
Days to harvest
70 days

Grower notes for Zone 9a

Blanch heads by folding outer leaves over developing curds when they reach 2 inches, unless growing a self-blanching variety.

Plant near: celery, onions

Keep away from: tomatoes, strawberries

Other brassicas for Zone 9a

Same crop, other zones

Track your own plantings

BAU Farm Intelligence turns these windows into per-field tasks — indoor seed-start reminders, transplant dates, harvest projections — using your farm's actual frost history.