Denham Springs, LA 70821 Frost Dates
70821, near Denham Springs, LA: the frost window
Typically, the last spring freeze lands around 02/25, roughly 181 days out. Fall's first freeze usually shows up around 11/26, roughly 276 days after the last spring frost.
Zone 9a (20 to 25°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 Denham Springs, not a forecast for this year.
Stretching the season past the first frost
Denham Springs's growing season runs out in roughly 13 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Denham Springs's last frost
02/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/19 and only about 1 year in 10 sees frost after that.
Denham Springs against the rest of the dataset
About 276 days separate Denham Springs's last and first frost, putting it 5,085 of 40,283 ZIP codes nationally. Within LA, it ranks 291 of 710.
Learn more
Two guides worth reading on 70821: local microclimates, on what one yard in Denham Springs can differ from the 70821 normal, and zone vs. frost date, on why Zone 9a and Denham Springs's frost date answer different questions.