Soil reaction is strongly acid or medium acid. Channer size rock fragments average from 0 to 35 percent above 40 inches. Below 40 inches the substratum is stratified loamy sand to very channery sand. These are the Larush , Samish and Wickersham soils in other families. Larush soils have a cambric horizon and an umbric epipedon.
Samish soils are in a fine-silty family.
Cokedale soils are on floodplains. Slopes are 0 to 3 percent. Elevation ranges from 120 to 1,200 feet. The average annual precipitation ranges from 45 to 80 inches. The frost-free season is 160 to 200 days.