Plevna, MT 59344 Frost Dates
Frost dates for Plevna, MT, ZIP 59344
The last spring frost here typically falls around 05/21, about 266 days from today. The first fall frost typically arrives around 09/20, about 121 frost-free days later.
Zone 4a (-30 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 Plevna, not a forecast for this year.
What to do before the first frost
Zone 4a around Plevna 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.
The actual range around Plevna's last frost
05/21 is the middle of 30 years of NOAA records, not a promise. Plant by 05/09 and you're betting against frost in roughly 9 years out of 10. 06/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Plevna compares
At roughly 121 frost-free days, Plevna places 39,056 of 40,283 ZIP codes in this dataset. Within MT, it ranks 212 of 392.
Learn more
the frost range explains how to read the range around Plevna's dates instead of trusting one, and local microclimates explains what one yard in Plevna can differ from the 59344 normal.