Green runs correspond fairly closely (although they are not found everywhere in Europe). Blue runs are similar, but American blues include some tougher intermediate runs that would be graded as red in the Alps. Single back diamond runs correspond to steeper European reds and the easier European blacks.

Therefore, it is always a good idea to start off on the "Easier" trails when visiting a new ski area; then, if you wish, progress to the "More Difficult" and "Most Difficult" as you get a feel for the area's general degree of difficulty. Snow conditions, visibility and the number of skiers can make a trail more difficult to ski than its rating may indicate.