Sanibel, FL 33956 Frost Dates
Frost dates for Sanibel, FL, ZIP 33956
Around 01/16 is the usual last spring frost, about 141 days away. The first fall frost typically arrives around 01/13, about 365 frost-free days later.
Sanibel sits in USDA Zone 10b (35 to 40°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 10b around Sanibel 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.
How much risk comes with planting early here
01/16 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. 02/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sanibel compares
About 365 days separate Sanibel's last and first frost, putting it 1,852 of 40,283 ZIP codes nationally. Within FL, it ranks 800 of 1,609.
Learn more
local microclimates explains what one yard in Sanibel can differ from the 33956 normal, and zone vs. frost date explains why Zone 10b and Sanibel's frost date answer different questions.