Key Biscayne, FL 00939 Frost Dates
00939, near Key Biscayne, FL: the frost window
The NOAA station nearest to 00939 does not report a usable frost-date normal for either event, so no last-frost or first-frost figure is shown here. The USDA hardiness zone below is still real: Zone 13a (60 to 65°F average annual minimum).
Key Biscayne against the rest of the dataset
About 365 days separate Key Biscayne's last and first frost, putting it 1,597 of 40,283 ZIP codes nationally. Within FL, it ranks 638 of 1,609.
Learn more
Two guides worth reading on 00939: the methodology, on exactly which NOAA and USDA figures feed 00939's numbers, and zone vs. frost date, on why Zone 13a and Key Biscayne's frost date answer different questions.