Conrad, MT 59425 Frost Dates
59425, near Conrad, MT: the frost window
The last spring frost here typically falls around 05/20, about 265 days from today. Fall's first freeze usually shows up around 09/19, roughly 119 days after the last spring frost.
Zone 4a (-30 to -25°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 Conrad, not a forecast for this year.
Stretching the season past the first frost
Conrad's growing season runs out in roughly 3 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Conrad's last frost
05/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/03 and only about 1 year in 10 sees frost after that.
Conrad against the rest of the dataset
About 119 days separate Conrad's last and first frost, putting it 39,146 of 40,283 ZIP codes nationally. Within MT, it ranks 221 of 392.
Learn more
Two guides worth reading on 59425: the frost range, on how to read the range around Conrad's dates instead of trusting one, and local microclimates, on what one yard in Conrad can differ from the 59425 normal.