Lodge Grass, MT 59035 Frost Dates
59035, near Lodge Grass, MT: the frost window
The last spring frost here typically falls around 05/07, about 252 days from today. Fall's first freeze usually shows up around 10/05, roughly 151 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 Lodge Grass, not a forecast for this year.
Stretching the season past the first frost
Lodge Grass's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/24 and only about 1 year in 10 sees frost after that.
Lodge Grass against the rest of the dataset
Lodge Grass's growing season runs about 151 days, ranking 35,144 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 18 of 392.
Learn more
Two guides worth reading on 59035: local microclimates, on what one yard in Lodge Grass can differ from the 59035 normal, and zone vs. frost date, on why Zone 5a and Lodge Grass's frost date answer different questions.