According to the USDA La Palma is in USDA Zone 10b. Here is some general info for USDA Zone 10b to help you get started.
Average Date of Last Frost (spring) | January 31 |
Average Date of First Frost (fall) | December 15 |
Lowest Expected Low | 35°F |
Highest Expected Low | 40°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.
You can view the USDA Zone map for California here:
Below is a list of planting guides for La Palma, CA. These guides are based on data from Zone 10b.
Vegetables
Herbs
Flowers