Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A way of figuring out when to plant calla lily is to consult the USDA zone info for San Bruno.

Planting Calendar for Calla Lily

Frost tolerance for calla lily:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since calla lily do not do well in cold weather it's necessary to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant calla lily in San Bruno is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant calla lily and expect a good harvest is probably September. Any later than that and your calla lily may not have a chance to fully mature. Starting your calla lily indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

In San Bruno the average date of last frost happens on January 31. It might get as low as 30°F during the coldest months of winter.

Since the USDA zone info for San Bruno is just an average the actual date of last frost can change quite a bit from year to year. Since half of the time in San Bruno last frost occurs after January 31 be ready to protect your calla lily in the event of a late frost.

USDA Zone Info for San Bruno

Here is the info for USDA Zone 10a.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	30°F
Highest Expected Low	35°F

This means that on a really cold year, the coldest it will get is 30°F. On most years you should be prepared to experience lows near 35°F.

Plants to Grow in San Bruno

You may be interested in your other planting guides for San Bruno.