Harahan, LA 70070 Frost Dates
When can you plant in Harahan, LA?
Around 01/30 is the usual last spring frost, about 155 days away. The first fall frost typically arrives around 12/31, about 333 frost-free days later.
The USDA Plant Hardiness Zone Map puts Harahan in Zone 9b (25 to 30°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 18 weeks of growing season left in Harahan before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 01/30 isn't a guarantee
01/30 is the middle of 30 years of NOAA records, not a promise. Plant by 02/27 and you're betting against frost in roughly 9 years out of 10. 12/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Harahan compares
Harahan's growing season runs about 333 days, ranking 2,844 of 40,283 US ZIP codes measured here, longest to shortest. Within LA, it ranks 41 of 710.
Learn more
zone vs. frost date covers why Zone 9b and Harahan's frost date answer different questions. the frost range covers how to read the range around Harahan's dates instead of trusting one.