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 | Jan 18 to Feb 1 |
| Transplant | Mar 8 to Mar 22 |
| Estimated harvest | May 22 to Jul 21 |
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 6 weeks before your last frost. Harden off and transplant a week or two after frost danger passes, burying the stem deep for strong roots.
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
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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.