When can I plant Dahlias in Zone 11a

One of the best tools that we have as gardeners to help us determine our gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

The first chance to plant dahlias in Zone 11a should be estimated by checking out the USDA zone info.


Planting Calendar for Dahlias

Frost tolerance for dahlias: Not tolerant of frost.
When you should plant them: After all chance of frost has passed.

Dahlias require warm weather which means that it's important to wait until it warms up after the last frost before you can plant them.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant dahlias
Possibly ok, but a risky time to plant dahlias
Probably not a good time to plant dahlias

The earliest that you can plant dahlias in Zone 11a is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant dahlias and expect a good harvest is probably November. Any later than that and your dahlias may not have a chance to grow to maturity. If you are starting your dahlias indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

In Zone 11a it never frosts. In the coldest months of winter we can expect an average low temperature of 40°F.

Remember that our actual date of last frost is not always accurate because it is based on the USDA zone info for Zone 11a and it will vary from year to year. Since it never frosts in Zone 11a you do not have to be ready to protect your dahlias if we have one of those late frosts.

USDA Zone Info for Zone 11a

Here is the info for USDA Zone 11a.

Average Date of Last Frost (spring)Never
Average Date of First Frost (fall)Never
Lowest Expected Low40°F
Highest Expected Low45°F

This means that on a really cold year, the coldest it will get is 40°F. On most years you should be prepared to experience lows near 45°F.

Plants to Grow in Zone 11a

You may be interested in our other planting guides for Zone 11a.