Port Gibson, MS 39144 Frost Dates
Port Gibson, MS: when does the frost end?
The last spring frost here typically falls around 03/17, about 201 days from today. Fall's first freeze usually shows up around 11/12, roughly 241 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Port Gibson 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
With roughly 11 weeks until Port Gibson's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/17 isn't a guarantee
03/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/07 and only about 1 year in 10 sees frost after that.
Port Gibson against the rest of the dataset
Port Gibson's growing season runs about 241 days, ranking 8,590 of 40,283 US ZIP codes measured here, longest to shortest. Within MS, it ranks 253 of 523.
Learn more
Before leaning on 39144's figures: the frost range explains how to read the range around Port Gibson's dates instead of trusting one, while local microclimates explains what one yard in Port Gibson can differ from the 39144 normal.