Crystal River, FL 34423 Frost Dates
34423, near Crystal River, FL: the frost window
The last spring frost here typically falls around 02/03, about 159 days from today. Fall's first freeze usually shows up around 01/03, roughly 329 days after the last spring frost.
Zone 9b (25 to 30°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 Crystal River, not a forecast for this year.
Stretching the season past the first frost
Crystal River's growing season runs out in roughly 18 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 02/03 isn't a guarantee
02/03 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 03/03 and only about 1 year in 10 sees frost after that.
Crystal River against the rest of the dataset
About 329 days separate Crystal River's last and first frost, putting it 3,108 of 40,283 ZIP codes nationally. Within FL, it ranks 1,191 of 1,609.
Learn more
Two guides worth reading on 34423: the frost range, on how to read the range around Crystal River's dates instead of trusting one, and local microclimates, on what one yard in Crystal River can differ from the 34423 normal.