Sanibel, FL 33957 Frost Dates
Sanibel, FL: when does the frost end?
Around 01/16 is the usual last spring frost, about 141 days away. Fall's first freeze usually shows up around 01/13, roughly 365 days after the last spring frost.
Zone 10b (35 to 40°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 Sanibel, not a forecast for this year.
Stretching the season past the first frost
With roughly 20 weeks until Sanibel's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
01/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 02/02 and only about 1 year in 10 sees frost after that.
Sanibel against the rest of the dataset
At roughly 365 frost-free days, Sanibel places 1,853 of 40,283 ZIP codes in this dataset. Within FL, it ranks 801 of 1,609.
Learn more
Before leaning on 33957's figures: local microclimates explains what one yard in Sanibel can differ from the 33957 normal, while zone vs. frost date explains why Zone 10b and Sanibel's frost date answer different questions.