Virginia City, MT 59755 Frost Dates
Virginia City, MT: when does the frost end?
The last spring frost here typically falls around 06/04, about 280 days from today. Fall's first freeze usually shows up around 09/18, roughly 106 days after the last spring frost.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Virginia City, not a forecast for this year.
Stretching the season past the first frost
With roughly 3 weeks until Virginia City's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 06/04 isn't a guarantee
06/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/23 and only about 1 year in 10 sees frost after that.
Virginia City against the rest of the dataset
At roughly 106 frost-free days, Virginia City places 39,589 of 40,283 ZIP codes in this dataset. Within MT, it ranks 288 of 392.
Learn more
Before leaning on 59755's figures: local microclimates explains what one yard in Virginia City can differ from the 59755 normal, while zone vs. frost date explains why Zone 5a and Virginia City's frost date answer different questions.