When to plant tomatoes in USDA Zone 9a

Plan your tomatoes 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: excellent
Tomatoes is well suited to Zone 9a. Standard planting dates work with minor adjustments for microclimates.

Key dates

Start seeds indoors
January 7 – January 21
Transplant outdoors
March 4 – March 25
Expected first harvest
May 25 – June 22
Fall planting window
August 18 – September 8
Fall harvest window
November 8 – December 6

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
24″
Row spacing
48″
Seed depth
0.25″
Soil temperature
70–85°F
Frost tolerance
tender
Days to harvest
75 days

Grower notes for Zone 9a

Set transplants deep — bury two-thirds of the stem to encourage adventitious roots. Stake or cage before fruit set.

Plant near: basil, carrots, onions

Keep away from: brassicas, corn, fennel

Other nightshades 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.