Laurel, MT 59057 Frost Dates
Frost dates for Laurel, MT, ZIP 59057
Typically, the last spring freeze lands around 05/24, roughly 269 days out. The first fall frost typically arrives around 09/21, about 116 frost-free days later.
The USDA Plant Hardiness Zone Map puts Laurel in Zone 4b (-25 to -20°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 4b around Laurel has about 3 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 05/24 isn't a guarantee
05/24 is the middle of 30 years of NOAA records, not a promise. Plant by 05/11 and you're betting against frost in roughly 9 years out of 10. 06/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Laurel compares
About 116 days separate Laurel's last and first frost, putting it 39,279 of 40,283 ZIP codes nationally. Within MT, it ranks 241 of 392.
Learn more
zone vs. frost date explains why Zone 4b and Laurel's frost date answer different questions, and the frost range explains how to read the range around Laurel's dates instead of trusting one.