When to plant tomatoes in USDA Zone 9b

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.

Orlando, Tampa, San Antonio, southern LA coast. Average last spring frost February 5, first fall frost December 15 — a 313-day frost-free season.

Zone fit: excellent
Tomatoes is well suited to Zone 9b. Standard planting dates work with minor adjustments for microclimates.

Key dates

Start seeds indoors
December 18 – January 1
Transplant outdoors
February 12 – March 5
Expected first harvest
May 5 – June 2
Fall planting window
September 1 – September 22
Fall harvest window
November 22 – December 20

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 9b

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 9b

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.