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Frost dates across Montana

Typical last spring frost, first fall frost, and USDA zone for 4 Montana cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.

Last spring frost, first fall frost, season length, and USDA zone by city in Montana
CityLast spring frostFirst fall frostSeason lengthZone
BillingsMay 10Oct 1about 144 days5a
MissoulaMay 10Oct 1about 144 days5b
Great FallsMay 6Oct 1about 148 days4b
BozemanMay 26Sep 22about 119 days5a

Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.

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