Mermentau, LA 70556 Frost Dates
When can you plant in Mermentau, LA?
The last spring frost here typically falls around 02/19, about 175 days from today. The first fall frost typically arrives around 12/04, about 292 frost-free days later.
The USDA Plant Hardiness Zone Map puts Mermentau 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
About 14 weeks of growing season left in Mermentau before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 02/19 isn't a guarantee
02/19 is the middle of 30 years of NOAA records, not a promise. Plant by 01/21 and you're betting against frost in roughly 9 years out of 10. 03/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mermentau compares
At roughly 292 frost-free days, Mermentau places 4,386 of 40,283 ZIP codes in this dataset. Within LA, it ranks 222 of 710.
Learn more
the frost range covers how to read the range around Mermentau's dates instead of trusting one. local microclimates covers what one yard in Mermentau can differ from the 70556 normal.