McNary, LA 71438 Frost Dates
Frost dates for McNary, LA, ZIP 71438
The last spring frost here typically falls around 03/01, about 185 days from today. The first fall frost typically arrives around 11/23, about 268 frost-free days later.
The USDA Plant Hardiness Zone Map puts McNary 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 McNary 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.
How much risk comes with planting early here
03/01 is the middle of 30 years of NOAA records, not a promise. Plant by 01/31 and you're betting against frost in roughly 9 years out of 10. 03/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How McNary compares
McNary's growing season runs about 268 days, ranking 5,826 of 40,283 US ZIP codes measured here, longest to shortest. Within LA, it ranks 424 of 710.
Learn more
zone vs. frost date explains why Zone 9a and McNary's frost date answer different questions, and the frost range explains how to read the range around McNary's dates instead of trusting one.