Plant Potatoes in Zone 12b
Seed-starting, transplant & harvest dates for USDA Zone 12b
Zone 12b is effectively frost-free, so the Zone 12b calendar for potatoes is set by heat, not cold. There is no last frost to count backward from and no first frost to beat, which means the question is not whether potatoes will finish but whether it will sit through the hottest stretch of the year. Potatoes is a half-hardy crop needing about 90 days from sowing to harvest.
Planting potatoes for a fall harvest in Zone 12b
Zone 12b has no meaningful frost, so the fall and winter months are the easiest time of year to grow potatoes here. Sow from about October 1 onward.
A fall potato crop works in zone 8 and warmer, planted in late summer from certified seed pieces that have broken dormancy.
Fall dates are counted backward from the Zone 12b average first frost, not forward from a sowing date. See the fall planting calendar by zone for the full method.
Spring vs fall potatoes in Zone 12b
| Planting | Sow or start | In the ground | Harvest |
|---|---|---|---|
| Spring | Feb 1 | Feb 1 | May 2 |
| Fall | Oct onward | Oct onward | Winter |
Potatoes in nearby zones
Further reading on potatoes
- Last frost date and what to plant before it
Why potatoes can go out before your last frost, and how far before.
- Best raised garden beds for beginners
Loose, deep soil is most of what root crops need.
- Row covers vs frost blankets
Which cover buys potatoes the extra degrees on a frosty night.
Other crops in Zone 12b
Frequently asked questions
When should I start potatoes in Zone 12b?
Direct sow outdoors around Feb 1.
Can I direct sow potatoes in Zone 12b?
Yes, direct sow around Feb 1.
Can I plant potatoes in the fall in Zone 12b?
Zone 12b has no meaningful frost, so the fall and winter months are the easiest time of year to grow potatoes here. Sow from about October 1 onward.
Will potatoes survive frost in Zone 12b?
Potatoes is a half-hardy crop and keeps going roughly 10 days past the first light frost in Zone 12b. A row cover or a straw mulch buys more.