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Frost dates and growing zones in Montana

3 town pages so far. Zones from the 2023 USDA Plant Hardiness Zone Map, frost dates from NOAA 1991-2020 normals at the nearest weather station.

Towns covered so far in Montana fall in USDA zones 4b, 5a. Median dates mean frost comes later (spring) or earlier (fall) in half of years.

Towns

Town	Zone	Median last frost	Median first frost
Billings	5a	May 4	Oct 7
Bozeman	5a	May 26	Sep 22
Helena	4b	May 9	Sep 30