Here is some general info for USDA zone 9a to help you get started.
Average Date of Last Frost (spring) | February 15 |
Average Date of First Frost (fall) | December 15 |
Lowest Expected Low | 20°F |
Highest Expected Low | 25°F |
This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.
Below is a list of planting guides for Zone 9a.
Vegetables
Herbs
Flowers