AgricultureID

State · US-IA

Iowa

Iowa lies almost entirely in the hot-summer humid continental (Dfa) zone, with warm, humid summers, cold winters, and precipitation concentrated in the growing season — a classic Corn Belt climate. Killing frosts bound a field season running from roughly late April to mid-October.

Major crop systems

  • Rainfed maize–soybean two-year rotation
  • Maize for grain, livestock feed, and ethanol
  • Alfalfa and hay for forage

Major livestock systems

  • Confined hog (swine) finishing — the largest concentration in the United States
  • Cattle feeding and cow–calf operations
  • Egg-layer poultry

Agricultural land: Iowa is among the most intensively farmed states in the country; deep, fertile prairie-derived Mollisols across the Des Moines Lobe and the loess-mantled uplands support near-continuous row-crop cultivation over most of the state. Irrigation: Production is overwhelmingly rainfed; irrigation is minor and largely confined to sandy soils and a few specialty crops.

Agroecological zones: Dfa (Hot-summer humid continental)

Documented crops & livestock

Official institutions

  • Iowa Department of Agriculture and Land Stewardship — State department for agriculture, soil conservation, and agricultural programs.
  • Iowa State University Extension and Outreach — Land-grant research and extension for crops, livestock, and farm management.
  • USDA National Agricultural Statistics Service (NASS) — Official state-level crop, livestock, and Census of Agriculture statistics, published through its regional field office network.

Data coverage & limitations

Descriptive profile; subnational statistics for Iowa are published by USDA NASS and the Iowa Department of Agriculture and Land Stewardship and are not reproduced numerically here.

  • Boundaries and administrative classification follow the ISO 3166-2 subdivision system and USDA/state reporting units.
  • No subnational statistics are reproduced here; any official figures are dated, versioned, and periodically revised — read them with their year and source.
  • A statewide profile conceals differences between the intensively cropped central and northern plains and the more dissected, mixed land use of the loess-hill margins.

Sources

This article draws on the following authoritative sources. See our sources & methodology for how they are selected.

  1. [1]USDA NASS — National Agricultural Statistics Service (opens in a new tab)

    USDA National Agricultural Statistics Service (NASS)

    Authoritative

    Cited for: Official state agricultural statistics

    Type:
    Government agency
    Jurisdiction:
    United States
    Accessed:
    2026-07-12
  2. [2]USDA — U.S. Department of Agriculture (opens in a new tab)

    United States Department of Agriculture (USDA)

    Authoritative

    Cited for: Federal agricultural context

    Type:
    Government agency
    Jurisdiction:
    United States
    Accessed:
    2026-07-12
  3. [3]Iowa State University Extension and Outreach (opens in a new tab)

    Iowa State University Extension and Outreach

    High

    Cited for: Iowa crop and livestock production context

    Type:
    University extension service
    Jurisdiction:
    United States (Iowa)
    Accessed:
    2026-07-12