When to plant sweet potato in zone 9b — planting calendar

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Showing USDA Zone 9B

Growing SeasonZone 9b

Last frost ~Feb 15First frost ~Dec 10Today

Start indoorsTransplant / sowHarvestFrost risk

FEBMARAPRMAYJUNJUL

Transplant Mar 8 · First harvest Jun 6 · Wrap by Jun 27

Last spring frostFeb 15

Transplant outMar 8

First harvestJun 6

Last harvestJun 27

First fall frostDec 10

Why these dates work in zone 9b

Zone 9b's last spring frost averages Feb 15 and first fall frost Dec 10 — about 298 frost-free days. Sweet Potato is frost-sensitive, so the 3w after frost timing builds in a safety margin against a late cold snap — setting plants out too early risks losing them to frost.

Common questions

How long does sweet potato take to grow in zone 9b?

Sweet Potato matures in about 90–120 days from transplanting. In zone 9b that means setting plants out around Mar 8 and first picking around Jun 6.

Will sweet potato survive frost in zone 9b?

No — sweet potato is frost-sensitive. In zone 9b, wait until after the last frost (around Feb 15) to plant, and harvest before the first fall frost (around Dec 10).

For soil, spacing, pests and companion planting, see the full sweet potato growing guide →