Pistachios grow best in hot, dry regions with long summers and low humidity, and today the major producers are the United States (mainly California), Iran, and Turkey, with additional orchards in countries like Syria, Afghanistan, Italy, Greece, and Spain.

Main growing regions

  • United States (California) : Over 99% of U.S. pistachios come from California’s Central Valley, especially counties like Kern, Fresno, Kings, Madera, and Tulare, with smaller areas in Arizona and New Mexico.
  • Middle East and Central Asia : Iran, Turkey, Syria, and Afghanistan have long traditions of pistachio cultivation and remain leading global producers, especially in arid inland areas.
  • Mediterranean Europe and beyond : Commercial pistachio orchards also exist in Italy, Greece, Spain, and limited areas in Chile and Central Asia, where climates resemble the semi‑desert conditions of the crop’s native range.

Climate and conditions they need

  • Pistachio trees thrive in arid or semi‑arid climates with long, hot summers and cool (but not severely wet or humid) winters, and they tolerate both drought and relatively saline soils.
  • They prefer full sun and well‑drained soil, struggle in high humidity or waterlogged ground, and are often planted with wide spacing in orchards, taking about 7–10 years to reach strong nut production.

Information gathered from public forums or data available on the internet and portrayed here.