Anaconda-Deer Lodge County, MT 59711 Frost Dates
Anaconda-Deer Lodge County, 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 09/14, roughly 105 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Anaconda-Deer Lodge County in Zone 5a (-20 to -15°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 2 weeks until Anaconda-Deer Lodge County's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Anaconda-Deer Lodge County's last frost
06/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/25 and only about 1 year in 10 sees frost after that.
Anaconda-Deer Lodge County against the rest of the dataset
Anaconda-Deer Lodge County's growing season runs about 105 days, ranking 39,597 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 292 of 392.
Learn more
Before leaning on 59711's figures: the frost range explains how to read the range around Anaconda-Deer Lodge County's dates instead of trusting one, while local microclimates explains what one yard in Anaconda-Deer Lodge County can differ from the 59711 normal.