St. Petersburg, FL 33701 Frost Dates
33701, near St. Petersburg, FL: the frost window
Around 01/17 is the usual last spring frost, about 142 days away. Fall's first freeze usually shows up around 01/15, roughly 365 days after the last spring frost.
St. Petersburg 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.
Stretching the season past the first frost
St. Petersburg's growing season runs out in roughly 20 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/17 isn't a guarantee
01/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/31 and only about 1 year in 10 sees frost after that.
St. Petersburg against the rest of the dataset
At roughly 365 frost-free days, St. Petersburg places 310 of 40,283 ZIP codes in this dataset. Within FL, it ranks 69 of 1,609.
Learn more
Two guides worth reading on 33701: local microclimates, on what one yard in St. Petersburg can differ from the 33701 normal, and zone vs. frost date, on why Zone 10b and St. Petersburg's frost date answer different questions.