Farmer’s Almanac Predicts Montana’s First Frost for Fall 2025

As summer begins to wind down in Montana, there's a certain urgency in the air. It's a final call to soak up the sunshine, mountain views, and long warm days before the first cold snap rolls in. Now is the perfect time to squeeze in those last lake days, hiking adventures, patio dinners, and weekend road trips.

In Montana, when the seasons change, they don’t ease in gently. Winter comes fast, and it stays. While some places throughout the state experienced scorching summer temperatures, much of Montana has not yet hit the triple digits.

The milder temperatures have been pleasant, but the days are getting shorter, and soon, we'll be lacing up our snow boots and bundling up in our warm winter jackets.

When to Expect the First Frost in Montana

Depending on where you live, whether it’s high up in the mountains or down in the valleys, the frost might arrive as early as late August or hold off until late September. Either way, that first icy morning is Montana’s gentle but firm reminder that winter waits for no one.

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The Old Farmer's Almanac used historical weather data from the National Oceanic and Atmospheric Administration for first and last frost dates from 1991 to 2020.

The dates are 30% probability, which means there's about a 3 in 10 chance frost will occur before or after the given date. Using data provided by NOAA, here are the dates that the first frost is expected in several cities and towns in Montana.

If you'd like to find first frost dates or information about a certain area or city, you can find it HERE.