When to plant zinnias 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 zinnias in Zone 9

The harvest estimate counts 60 days to maturity, then a picking window of about 70 days. These windows use typical frost dates for Zone 9; Dibble pins them to your exact ZIP code.

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Zinnia in a Zone 9 season

Zone 9 gives about 275 frost-free days. Zinnia needs roughly 60 days from sowing. That leaves about 215 days of slack, so there is room for a late start or a second planting.

Sowing every 21 days, Zone 9 has room for about 11 plantings.

How to grow zinnias

Sow zinnias once the soil is warm and nights stay mild. Cut often: the more you pick, the more they bloom. Space them for good air flow, which keeps mildew away in humid weather.

Companion plants

Good neighbors for Zinnia:

Zinnia in other zones

Not in Zone 9? Pick your zone for the same dated windows.

Keep exploring

Zinnia: 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.