Grand Isle, LA 70358 Frost Dates
Frost dates for Grand Isle, LA, ZIP 70358
Typically, the last spring freeze lands around 02/08, roughly 164 days out. The first fall frost typically arrives around 12/19, about 311 frost-free days later.
The USDA Plant Hardiness Zone Map puts Grand Isle in Zone 10a (30 to 35°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 10a around Grand Isle has about 16 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.
The actual range around Grand Isle's last frost
02/08 is the middle of 30 years of NOAA records, not a promise. Plant by 01/11 and you're betting against frost in roughly 9 years out of 10. 03/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Grand Isle compares
About 311 days separate Grand Isle's last and first frost, putting it 3,543 of 40,283 ZIP codes nationally. Within LA, it ranks 86 of 710.
Learn more
zone vs. frost date explains why Zone 10a and Grand Isle's frost date answer different questions, and the frost range explains how to read the range around Grand Isle's dates instead of trusting one.