Hattiesburg, MS 39403 Frost Dates
39403, near Hattiesburg, MS: the frost window
The last spring frost here typically falls around 03/07, about 191 days from today. Fall's first freeze usually shows up around 11/23, roughly 261 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hattiesburg in Zone 8b (15 to 20°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
Hattiesburg'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 Hattiesburg's last frost
03/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/26 and only about 1 year in 10 sees frost after that.
Hattiesburg against the rest of the dataset
Hattiesburg's growing season runs about 261 days, ranking 6,270 of 40,283 US ZIP codes measured here, longest to shortest. Within MS, it ranks 51 of 523.
Learn more
Two guides worth reading on 39403: zone vs. frost date, on why Zone 8b and Hattiesburg's frost date answer different questions, and the frost range, on how to read the range around Hattiesburg's dates instead of trusting one.