DibbleWhen to plant tomatoes 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 tomatoes in Zone 9
| Task | Window |
|---|---|
| Start seeds indoors | Feb 1 to Feb 15 |
| Transplant | Mar 22 to Apr 5 |
| Estimated harvest | Jun 5 to Aug 4 |
The harvest estimate counts 75 days to maturity, then a picking window of about 60 days. These windows use typical frost dates for Zone 9; Dibble pins them to your exact ZIP code.
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Tomato in a Zone 9 season
Zone 9 gives about 275 frost-free days. Tomato needs roughly 75 days from transplant. That leaves about 200 days of slack, so there is room for a late start or a second planting.
How to grow tomatoes
Start seeds indoors about 7 weeks before you plan to plant out. Harden the seedlings off and transplant once nights stay warm, burying the stem deep for strong roots. In hot, humid climates choose the drier, cooler months, because flowers drop in sticky heat.
Companion plants
Good neighbors for Tomato:
Better kept apart:
Tomato in other zones
Not in Zone 9? Pick your zone for the same dated windows.
Keep exploring
Tomato: 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.