St. Marks, FL 32326 Frost Dates
Frost dates for St. Marks, FL, ZIP 32326
Typically, the last spring freeze lands around 03/14, roughly 198 days out. The first fall frost typically arrives around 11/23, about 255 frost-free days later.
The USDA Plant Hardiness Zone Map puts St. Marks in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 9a around St. Marks has about 12 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.
The actual range around St. Marks's last frost
03/14 is the middle of 30 years of NOAA records, not a promise. Plant by 02/20 and you're betting against frost in roughly 9 years out of 10. 04/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Marks compares
St. Marks's growing season runs about 255 days, ranking 6,970 of 40,283 US ZIP codes measured here, longest to shortest. Within FL, it ranks 1,581 of 1,609.
Learn more
zone vs. frost date explains why Zone 9a and St. Marks's frost date answer different questions, and the frost range explains how to read the range around St. Marks's dates instead of trusting one.