Diamondhead, MS 39521 Frost Dates
Frost dates for Diamondhead, MS, ZIP 39521
The last spring frost here typically falls around 03/06, about 190 days from today. The first fall frost typically arrives around 11/19, about 262 frost-free days later.
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.
What to do before the first frost
Zone 9a around Diamondhead has about 12 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.
Why 03/06 isn't a guarantee
03/06 is the middle of 30 years of NOAA records, not a promise. Plant by 02/05 and you're betting against frost in roughly 9 years out of 10. 03/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Diamondhead compares
At roughly 262 frost-free days, Diamondhead places 6,226 of 40,283 ZIP codes in this dataset. Within MS, it ranks 45 of 523.
Learn more
the frost range explains how to read the range around Diamondhead's dates instead of trusting one, and local microclimates explains what one yard in Diamondhead can differ from the 39521 normal.