When can I plant Delphinium in Zone 12a

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.

It's a good idea to estimate when it's possible to plant delphinium by using the USDA zone info for Zone 12a.


Planting Calendar for Delphinium

Frost tolerance for delphinium: Tolerant of a very small amount of frost.
When you should plant them: Up to 3 weeks before last frost.

You can plant delphinium a bit earlier in the year because they do ok in moderate cold.

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

The earliest that you can plant delphinium in Zone 12a 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 delphinium and expect a good harvest is probably November. If you wait any later than that and your delphinium may not have a chance to grow to maturity. Starting your delphinium indoors is a great way to get them started a little bit earlier.

Last Frost Date

In Zone 12a it never frosts. It might get as low as 50°F during the coldest months of winter.

Since the USDA zone info for Zone 12a is an average our actual date of last frost will vary from year to year. Since it never frosts in Zone 12a you do not have to be ready to cover your delphinium if we have a surprise late frost.

USDA Zone Info for Zone 12a

Here is the info for USDA Zone 12a.

Average Date of Last Frost (spring)Never
Average Date of First Frost (fall)Never
Lowest Expected Low50°F
Highest Expected Low55°F

This means that on a really cold year, the coldest it will get is 50°F. On most years you should be prepared to experience lows near 55°F.

Plants to Grow in Zone 12a

You may be interested in our other planting guides for Zone 12a.