DibbleWhen to plant marigolds 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 marigolds in Zone 9
| Task | Window |
|---|---|
| Start seeds indoors | Jan 18 to Feb 1 |
| Transplant | Mar 1 to Mar 15 |
| Estimated harvest | Apr 20 to Jul 19 |
The harvest estimate counts 50 days to maturity, then a picking window of about 90 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.
Marigold in a Zone 9 season
Zone 9 gives about 275 frost-free days. Marigold needs roughly 50 days from transplant. That leaves about 225 days of slack, so there is room for a late start or a second planting.
How to grow marigolds
Start indoors 6 weeks before last frost and transplant around frost date. A classic companion that deters many pests.
Companion plants
Good neighbors for Marigold:
Marigold in other zones
Not in Zone 9? Pick your zone for the same dated windows.
Keep exploring
Marigold: 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.