Denton, MT 59424 Frost Dates
Denton, MT: when does the frost end?
Typically, the last spring freeze lands around 06/01, roughly 277 days out. Fall's first freeze usually shows up around 09/11, roughly 101 days after the last spring frost.
Denton sits in USDA Zone 4b (-25 to -20°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
With roughly 2 weeks until Denton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Denton's last frost
06/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/26 and only about 1 year in 10 sees frost after that.
Denton against the rest of the dataset
At roughly 101 frost-free days, Denton places 39,690 of 40,283 ZIP codes in this dataset. Within MT, it ranks 298 of 392.
Learn more
Before leaning on 59424's figures: the frost range explains how to read the range around Denton's dates instead of trusting one, while local microclimates explains what one yard in Denton can differ from the 59424 normal.