Hass  is the second leading variety from California, with production averaging about 50 percent of the Fuerte total. The Hass is of the Guatemalan race but a seedling of California origin. It was introduced by R.G. Hass of LaHabra Heights. The fruit runs from 6 to 12 oz., has a leathery and somewhat rough skin of medium thickness, is green at maturity but gradually turns black.  Hass avocados will turn a dark green or black when ripe, but other varieties such as Fuerte, will stay green even when ripe.