Broadus, MT 59332 Frost Dates
59332, near Broadus, MT: the frost window
The last spring frost here typically falls around 05/17, about 262 days from today. Fall's first freeze usually shows up around 09/22, roughly 127 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Broadus in Zone 4b (-25 to -20°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
Broadus's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Broadus's last frost
05/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Broadus against the rest of the dataset
At roughly 127 frost-free days, Broadus places 38,651 of 40,283 ZIP codes in this dataset. Within MT, it ranks 152 of 392.
Learn more
Two guides worth reading on 59332: local microclimates, on what one yard in Broadus can differ from the 59332 normal, and zone vs. frost date, on why Zone 4b and Broadus's frost date answer different questions.