DibbleWhen to plant tomatoes in Zone 10
In Zone 10, the last spring frost usually passes around January 31 and the first fall frost arrives around December 15, leaving about 318 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Nearly frost-free. Grow cool crops in winter; summers are too hot for many vegetables.
Planting windows for tomatoes in Zone 10
| Task | Window |
|---|---|
| Start seeds indoors | Dec 20 to Jan 3 |
| Transplant | Feb 7 to Feb 21 |
| Estimated harvest | Apr 23 to Jun 22 |
The harvest estimate counts 75 days to maturity, then a picking window of about 60 days. These windows use typical frost dates for Zone 10; Dibble pins them to your exact ZIP code.
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Tomato in a Zone 10 season
Zone 10 gives about 318 frost-free days. Tomato needs roughly 75 days from transplant. That leaves about 243 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 10? Pick your zone for the same dated windows.
Keep exploring
Tomato: the full growing guide · The Zone 10 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.