Union, MS 39337 Frost Dates
Frost dates for Union, MS, ZIP 39337
Typically, the last spring freeze lands around 03/24, roughly 208 days out. The first fall frost typically arrives around 11/05, about 228 frost-free days later.
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.
What to do before the first frost
Zone 8b around Union has about 10 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
03/24 is the middle of 30 years of NOAA records, not a promise. Plant by 03/01 and you're betting against frost in roughly 9 years out of 10. 04/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Union compares
About 228 days separate Union's last and first frost, putting it 10,853 of 40,283 ZIP codes nationally. Within MS, it ranks 389 of 523.
Learn more
local microclimates explains what one yard in Union can differ from the 39337 normal, and zone vs. frost date explains why Zone 8b and Union's frost date answer different questions.