Diamondhead, MS 39522 Frost Dates
39522, near Diamondhead, MS: the frost window
Typically, the last spring freeze lands around 03/06, roughly 190 days out. Fall's first freeze usually shows up around 11/19, roughly 262 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Diamondhead in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Diamondhead's growing season runs out in roughly 12 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 Diamondhead's last frost
03/06 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 03/27 and only about 1 year in 10 sees frost after that.
Diamondhead against the rest of the dataset
Diamondhead's growing season runs about 262 days, ranking 6,227 of 40,283 US ZIP codes measured here, longest to shortest. Within MS, it ranks 46 of 523.
Learn more
Two guides worth reading on 39522: zone vs. frost date, on why Zone 9a and Diamondhead's frost date answer different questions, and the frost range, on how to read the range around Diamondhead's dates instead of trusting one.