Agriculture in Idaho
ZIP codes in our Idaho data
USDA hardiness zones present
Agriculture is one of Idaho's foundational industries, shaping the economy and landscape of much of the state. From the irrigated fields of the Snake River Plain to the dryland wheat country of the north, farming and ranching support rural communities and supply food across the country. Understanding what grows well here helps both commercial producers and home gardeners plan for success.
Farming in Idaho
Idaho is best known as the leading potato-producing state in the nation, and potatoes remain a signature crop tied closely to the state's identity. Beyond potatoes, growers raise wheat, barley, sugar beets, hay and alfalfa, onions, dry beans, lentils, peas, hops, and mint. Livestock is equally important: Idaho is a major dairy state, producing large quantities of milk and cheese, and it also supports substantial beef cattle operations. The state is a national leader in farmed trout, raised in the cold spring-fed waters of the Magic Valley.
Climate and growing conditions
Idaho has a generally semi-arid, continental climate, with hot dry summers and cold winters, so much of the state's crop production depends on irrigation drawn from the Snake River and mountain snowmelt. The growing season varies sharply with elevation, running long and mild in lower valleys like the Treasure Valley and short in the high mountain basins. USDA hardiness zones range from about 3 in the coldest mountain valleys to roughly 7 in the warmer lower elevations near Lewiston and parts of southwestern Idaho.
Major agricultural products
- Potatoes
- Milk and dairy products
- Beef cattle
- Wheat
- Barley
- Sugar beets
- Hay and alfalfa
- Farmed trout
Hardiness zones in Idaho
Growers in Idaho fall across these USDA plant hardiness zones (by number of ZIP codes in our data):
Local weather & frost dates in Idaho
Open any location for its live forecast, frost dates, and planting calendar:
Counties in Idaho
Browse local growing conditions, hardiness zones, and weather by county (48 counties):
Market prices & data for Idaho
State overviews combine hardiness-zone data from our ZIP database with public USDA market reports and NOAA climate normals. For farm-level decisions, consult your state's Cooperative Extension service. Page updated Aug 4, 2026.