Simpson, LA 71455 Frost Dates
Frost dates for Simpson, LA, ZIP 71455
The last spring frost here typically falls around 03/02, about 186 days from today. The first fall frost typically arrives around 11/27, about 271 frost-free days later.
Zone 9a (20 to 25°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 Simpson, not a forecast for this year.
What to do before the first frost
Zone 9a around Simpson has about 13 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 03/02 isn't a guarantee
03/02 is the middle of 30 years of NOAA records, not a promise. Plant by 02/01 and you're betting against frost in roughly 9 years out of 10. 03/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Simpson compares
About 271 days separate Simpson's last and first frost, putting it 5,467 of 40,283 ZIP codes nationally. Within LA, it ranks 343 of 710.
Learn more
zone vs. frost date explains why Zone 9a and Simpson's frost date answer different questions, and the frost range explains how to read the range around Simpson's dates instead of trusting one.