DibbleWhen to plant sweet potato 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 sweet potato in Zone 9
| Task | Window |
|---|---|
| Transplant | Mar 22 to Apr 5 |
| Estimated harvest | Jun 30 to Jul 14 |
The harvest estimate counts 100 days to maturity, then a picking window of about 14 days. These windows use typical frost dates for Zone 9; Dibble pins them to your exact ZIP code.
Get reminders for these exact dates
Dibble turns your ZIP code into a full planting calendar and reminds you on the right day. Free to start, no account needed.
How to grow sweet potato
Plant slips 3 weeks after last frost when soil is thoroughly warm. Harvest before the first fall frost nips the vines.
Companion plants
Good neighbors for Sweet Potato:
Better kept apart:
Sweet Potato in nearby zones
Keep exploring
Sweet Potato: the full growing guide · The Zone 9 planting calendar · Every crop and zone
Plant at the right time this season
Dibble builds your calendar in under a minute. Free to start, no account needed.
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.