Outlook, MT 59252 Frost Dates
Outlook, MT: when does the frost end?
Around 05/28 is the usual last spring frost, about 273 days away. Fall's first freeze usually shows up around 09/07, roughly 101 days after the last spring frost.
Zone 3b (-35 to -30°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 Outlook, not a forecast for this year.
Stretching the season past the first frost
With roughly 1 week until Outlook's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/28 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 06/13 and only about 1 year in 10 sees frost after that.
Outlook against the rest of the dataset
About 101 days separate Outlook's last and first frost, putting it 39,698 of 40,283 ZIP codes nationally. Within MT, it ranks 300 of 392.
Learn more
Before leaning on 59252's figures: zone vs. frost date explains why Zone 3b and Outlook's frost date answer different questions, while the frost range explains how to read the range around Outlook's dates instead of trusting one.