The JA Ranch is a historic cattle ranch in the Palo Duro Canyon in Armstrong County, Texas. Founded in 1876 by Charles Goodnight and John George Adair, it is the oldest cattle ranching operation in the Texas Panhandle. Its headquarters area was designated a National Historic Landmark in 1960 for its association with Goodnight, one of the most …The JA Ranch is a historic cattle ranch in the Palo Duro Canyon in Armstrong County, Texas. Founded in 1876 by Charles Goodnight and John George Adair, it is the oldest cattle ranching operation in the Texas Panhandle. Its headquarters area was designated a National Historic Landmark in 1960 for its association with Goodnight, one of the most influential cattle barons of the late 19th century. The ranch is an ongoing business, operated by Adair's descendants.