When can I plant Alstromeria in Zone 10b

One of the first steps we take when we are determining our gardening schedule is find our USDA Zone info. 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 10b should be reffered to in order to determine when it's possible to plant alstromeria.


Planting Calendar for Alstromeria

Frost tolerance for alstromeria: Tolerant of some frost.
When you should plant them: Up to 5 weeks before last frost.

You can plant alstromeria a little bit earlier in the year because they are one of those plants that can tolerate a little bit of cold weather.

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

The earliest that you can plant alstromeria in Zone 10b 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 alstromeria and expect a good harvest is probably October. Any later than that and your alstromeria may not have a chance to really do well. If you are starting your alstromeria indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

In Zone 10b the average date of last frost happens on January 31. We can expect an average low temperature of 35°F in the coldest months of winter.

Since the USDA zone info for Zone 10b is just an average our actual date of last frost can change quite a bit from year to year. Since half of the time in Zone 10b last frost occurs after January 31 be ready to protect your alstromeria if we have a surprise late frost.

USDA Zone Info for Zone 10b

Here is the info for USDA Zone 10b.

Average Date of Last Frost (spring)January 31
Average Date of First Frost (fall)December 15
Lowest Expected Low35°F
Highest Expected Low40°F

This means that on a really cold year, the coldest it will get is 35°F. On most years you should be prepared to experience lows near 40°F.

Plants to Grow in Zone 10b

You may be interested in our other planting guides for Zone 10b.