Walkerville, MT 59701 Frost Dates
59701, near Walkerville, MT: the frost window
Typically, the last spring freeze lands around 06/13, roughly 289 days out. Fall's first freeze usually shows up around 09/05, roughly 83 days after the last spring frost.
Walkerville sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Walkerville's growing season runs out in roughly 1 week — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 06/13 isn't a guarantee
06/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/01 and only about 1 year in 10 sees frost after that.
Walkerville against the rest of the dataset
At roughly 83 frost-free days, Walkerville places 40,028 of 40,283 ZIP codes in this dataset. Within MT, it ranks 357 of 392.
Learn more
Two guides worth reading on 59701: local microclimates, on what one yard in Walkerville can differ from the 59701 normal, and zone vs. frost date, on why Zone 5a and Walkerville's frost date answer different questions.