When can I plant Tree onions in Zone 12b

The USDA Zone info is a great tool for gardeners to help us estimate our gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

The USDA zone info for Zone 12b should be looked at to figure out when it's possible to plant tree onions.


Planting Calendar for Tree onions

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

Since tree onions are barely cold tolerant you can plant them just a tiny bit earlier in the year than other frost tender plants.

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

The earliest that you can plant tree onions in Zone 12b 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 tree onions and expect a good harvest is probably November. Any later than that and your tree onions may not have a chance to fully mature. You can get started a little bit earlier by starting your tree onions indoors.

Last Frost Date

In Zone 12b it never frosts. We should expect an average low temperature of 55°F in the coldest months of winter.

It's important to remember that USDA zone info for Zone 12b may not be accurate from year to year and our actual date of last frost will vary from year to year. Since it never frosts in Zone 12b you do not have to be ready to cover your tree onions in the event of one of those late frosts.

USDA Zone Info for Zone 12b

Here is the info for USDA Zone 12b.

Average Date of Last Frost (spring)Never
Average Date of First Frost (fall)Never
Lowest Expected Low55°F
Highest Expected Low60°F

This means that on a really cold year, the coldest it will get is 55°F. On most years you should be prepared to experience lows near 60°F.

Plants to Grow in Zone 12b

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