According to the USDA Islamorada is in USDA Zone 11a. Here is some general info for USDA Zone 11a to help you get started.
Average Date of Last Frost (spring) | Never |
Average Date of First Frost (fall) | Never |
Lowest Expected Low | 40°F |
Highest Expected Low | 45°F |
This means that on a really cold year, the coldest it will get is 40°F. On most years you should be prepared to experience lows near 45°F.
You can view the USDA Zone map for Florida here:
Below is a list of planting guides for Islamorada, FL. These guides are based on data from Zone 11a.
Vegetables
Herbs
Flowers