The colours give a guide to the gradient of the slope and the difficulty of the run:
Green: very easy, corresponds to a beginner level and nursery slopes
Blue: Easy, the gradient has increased and can include a few bumps and rollers.
Red: Steep slopes, intermediate or above. Can be challenging in places
Black: technically difficult and steep. Advanced levels only.
Take a look at the
piste maps to plan your day on the mountain.