Elberta, Envoy, the Haven series, Polly, Reliance and Redskin are suggestions to try in Colorado. There are three main types of plum- Japanese, European, and American. They may be free stone or cling. Japanese are the least cold hardy and flower early. Their blooms are often frost damaged.
European plums are of a higher quality than Native American plums, which are useful for preserves.
European plums are most recommended for Colorado growers. Suggestions include Stanley, Green Gage, Blue Damson, Waneta, President, and Sapalta. There are two main types- tart or sour cherries, and sweet cherries. Tart cherries are the most dependable for Colorado. Sweet cherries are not as winter hardy.