Union, MS 39325 Frost Dates
Union, MS: when does the frost end?
Typically, the last spring freeze lands around 03/16, roughly 200 days out. Fall's first freeze usually shows up around 11/12, roughly 239 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Union 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 Union's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/16 isn't a guarantee
03/16 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 04/03 and only about 1 year in 10 sees frost after that.
Union against the rest of the dataset
Union's growing season runs about 239 days, ranking 8,836 of 40,283 US ZIP codes measured here, longest to shortest. Within MS, it ranks 263 of 523.
Learn more
Before leaning on 39325's figures: zone vs. frost date explains why Zone 8b and Union's frost date answer different questions, while the frost range explains how to read the range around Union's dates instead of trusting one.