Plant Cucumbers in Zone 12b
Seed-starting, transplant & harvest dates for USDA Zone 12b
Zone 12b is effectively frost-free, so the Zone 12b calendar for cucumbers 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 cucumbers will finish but whether it will sit through the hottest stretch of the year. Cucumbers is a tender crop needing about 60 days from sowing to harvest.
Planting cucumbers 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 cucumbers here. Sow from about October 1 onward.
A second sowing in midsummer usually dodges the worst of the cucumber beetle and powdery mildew pressure that kills the spring planting.
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 cucumbers in Zone 12b
| Planting | Sow or start | In the ground | Harvest |
|---|---|---|---|
| Spring | Feb 1 | Feb 1 | Apr 2 |
| Fall | Oct onward | Oct onward | Winter |
Cucumbers in nearby zones
Further reading on cucumbers
- When to start seeds indoors by zone
Indoor start dates for cucumbers, counted back from your last frost.
- Hardening off seedlings: a schedule
A day by day plan for moving cucumbers seedlings outdoors.
- Best grow lights for seed starting
What light seedlings actually need, and which fixtures deliver it.
Other crops in Zone 12b
Frequently asked questions
When should I start cucumbers in Zone 12b?
Direct sow outdoors around Feb 1.
Can I direct sow cucumbers in Zone 12b?
Yes, direct sow around Feb 1.
Can I plant cucumbers 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 cucumbers here. Sow from about October 1 onward.
Will cucumbers survive frost in Zone 12b?
No. Cucumbers is a tender crop and a single light frost ends it, so every Zone 12b planting has to finish before the average first frost (Zone 12b rarely sees one).