DibbleWhen to plant potatoes in Zone 9
In Zone 9, the last spring frost usually passes around March 1 and the first fall frost arrives around December 1, leaving about 275 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Very long season. Plant cool crops in fall and winter; manage summer heat.
Planting windows for potatoes in Zone 9
| Task | Window |
|---|---|
| Direct sow | Feb 15 to Mar 1 |
| Estimated harvest | May 16 to Jun 6 |
The harvest estimate counts 90 days to maturity, then a picking window of about 21 days. These windows use typical frost dates for Zone 9; Dibble pins them to your exact ZIP code.
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Potato in a Zone 9 season
Zone 9 gives about 275 frost-free days. Potato needs roughly 90 days from sowing. That leaves about 185 days of slack, so there is room for a late start or a second planting.
How to grow potatoes
Plant seed potato pieces, each with an eye, about a hand's width deep once the soil is workable and no longer cold and soggy. Hill soil up around the stems as the plants grow. Tubers stall in hot weather, so aim for the cooler part of the year.
Companion plants
Good neighbors for Potato:
Better kept apart:
Potato in other zones
Not in Zone 9? Pick your zone for the same dated windows.
Keep exploring
Potato: the full growing guide · The Zone 9 planting calendar · Every crop and zone
Plant at the right time this season
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Dates are estimates based on typical frost dates for the zone. Your yard has its own microclimate, so use them as a starting point and adjust as you learn your space.