Sweet potatoes planting calendar for USDA Zone 9b

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

Sweet potatoes 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 19 – March 12

Expected first harvest

June 6 – July 4

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: 12″
Row spacing: 42″
Seed depth: 4″
Soil temperature: 75–90°F
Frost tolerance: tender
Days to harvest: 100 days

Grower notes for Zone 9b

Set slips on 6–8 inch hills for better tuber shape. Cure at 85°F and 85% humidity for 7–10 days after harvest.

Plant near: beans, peas

Keep away from: squash

Other root crops 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.

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