Montana frost dates by county and ZIP code
Across 369 Montana ZIP codes the average last spring frost runs Apr 30 to Jun 18 and the average first fall frost Sep 2 to Oct 15 (50% odds, 32°F, NOAA 1991–2020 normals), with USDA hardiness zones. Download the table as CSV.
Counties
- Beaverhead
- Big Horn
- Blaine
- Broadwater
- Carbon
- Carter
- Cascade
- Chouteau
- Custer
- Daniels
- Dawson
- Deer Lodge
- Fallon
- Fergus
- Flathead
- Gallatin
- Garfield
- Glacier
- Golden Valley
- Granite
- Hill
- Jefferson
- Judith Basin
- Lake
- Lewis and Clark
- Liberty
- Lincoln
- Madison
- McCone
- Meagher
- Mineral
- Missoula
- Musselshell
- Park
- Petroleum
- Phillips
- Pondera
- Powder River
- Powell
- Prairie
- Ravalli
- Richland
- Roosevelt
- Rosebud
- Sanders
- Sheridan
- Silver Bow
- Stillwater
- Sweet Grass
- Teton
- Toole
- Treasure
- Valley
- Wheatland
- Wibaux
- Yellowstone
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