Grand Isle, LA 70041 Frost Dates
70041, near Grand Isle, LA: the frost window
The last spring frost here typically falls around 01/25, about 150 days from today. Fall's first freeze usually shows up around 01/04, roughly 346 days after the last spring frost.
Zone 10a (30 to 35°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Grand Isle, not a forecast for this year.
Stretching the season past the first frost
Grand Isle's growing season runs out in roughly 18 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/25 isn't a guarantee
01/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/31 and only about 1 year in 10 sees frost after that.
Grand Isle against the rest of the dataset
Grand Isle's growing season runs about 346 days, ranking 2,451 of 40,283 US ZIP codes measured here, longest to shortest. Within LA, it ranks 11 of 710.
Learn more
Two guides worth reading on 70041: zone vs. frost date, on why Zone 10a and Grand Isle's frost date answer different questions, and the frost range, on how to read the range around Grand Isle's dates instead of trusting one.