Froid, MT 59226 Frost Dates
Froid, MT: when does the frost end?
Typically, the last spring freeze lands around 05/16, roughly 261 days out. Fall's first freeze usually shows up around 09/18, roughly 125 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Froid in Zone 4a (-30 to -25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 3 weeks until Froid's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Froid's last frost
05/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/30 and only about 1 year in 10 sees frost after that.
Froid against the rest of the dataset
Froid's growing season runs about 125 days, ranking 38,817 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 178 of 392.
Learn more
Before leaning on 59226's figures: the frost range explains how to read the range around Froid's dates instead of trusting one, while local microclimates explains what one yard in Froid can differ from the 59226 normal.