Sweet Potato in Zone 10a & 10b
Ipomoea batatas
Yes, sweet potato grows in zones 10a and 10b. Start seeds indoors in Jan–Apr and plant out in Mar–Jun.
When to plant sweet potato in zone 10b
Zones 10a and 10b share the same average frost dates, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. It needs a head start most zones can't give it by direct-sowing alone.
| Window | Spring window |
|---|---|
| Start indoors | Jan–Apr |
| Direct sow / transplant outside | Mar–Jun |
| Estimated harvest | ~110 days after transplanting |
Spacing: about 4 square feet per plant (square-foot-gardening spacing). Mature height: 0.5-1 ft.
Zone 10b dates sourced from growinginthegarden.com.
Plant alongside it in zone 10b
These go outside within two weeks of sweet potato in zone 10b, so one planting day can cover them.
- Winter SquashMar
- Edamame (Soybean)Mar–Apr
- EggplantMar–Apr
- OkraMar–Jun
- PeanutMar–Apr
- PumpkinMar
Sweet potato isn't related to the regular potato at all. It's grown from slips, which are rooted sprouts started from a mature sweet potato, rather than from seed or a cut tuber. It also wants more heat and a longer season than most gardeners expect, which is why an early indoor start matters even though the plant itself is a vigorous, sprawling vine once it's established.
How sweet potato fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Sweet potato needs about 110 days from transplant to first harvest.
Sweet Potato planting windows in every zone
Zone 10b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 6a & 6b | Feb 28–Mar 7 | May 16–May 23 | Sep 3–Sep 10 |
| 7a & 7b | Feb 13–Feb 20 | May 1–May 8 | Aug 19–Aug 26 |
| 8a & 8b | Jan 28–Feb 4 | Apr 15–Apr 22 | Aug 3–Aug 10 |
| 9a & 9b | Dec 21–Dec 28 | Mar 8–Mar 15 | Jun 26–Jul 3 |
| 10a & 10bSpring window (your zone) | Jan–Apr | Mar–Jun | ~110 days after transplanting |
| 11a & 11bFall window | Oct–Jul | Dec–Sep | ~110 days after transplanting |
Harvest dates are about 110 days after the sow or plant-out date, not after starting seeds indoors.
Good companions
- Bush Beans: Beans fix nitrogen that heavy-feeding sweet potato vines use.
Where to buy sweet potato seeds
None of the seed suppliers we list carries sweet potato seeds right now. A local garden center or a specialty seed house is the place to look.
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing sweet potato" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 10b calendar · Plan your beds in the Garden Designer →
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Growing Sweet Potato in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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