Port St. Lucie, FL 34986 Frost Dates
Frost dates for Port St. Lucie, FL, ZIP 34986
Typically, the last spring freeze lands around 01/24, roughly 149 days out. The first fall frost typically arrives around 01/14, about 365 frost-free days later.
Zone 10a (30 to 35°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Port St. Lucie, not a forecast for this year.
What to do before the first frost
Zone 10a around Port St. Lucie has about 20 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 01/24 isn't a guarantee
01/24 is the middle of 30 years of NOAA records, not a promise. Plant by 01/01 and you're betting against frost in roughly 9 years out of 10. 02/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Port St. Lucie compares
At roughly 365 frost-free days, Port St. Lucie places 319 of 40,283 ZIP codes in this dataset. Within FL, it ranks 78 of 1,609.
Learn more
zone vs. frost date explains why Zone 10a and Port St. Lucie's frost date answer different questions, and the frost range explains how to read the range around Port St. Lucie's dates instead of trusting one.