North American Trail Ratings

Green Circle (Slope angles ranging from 6% to 25%)

The green circles indicate the easier trails at a mountain which are generally wide, groomed, and with an amiable slope. Green Circle trails are popular with beginners.

Blue square (Slope angles ranging from 25% to 40%)

Intermediate difficulty, skiing trails that are more steep than beginner skiing trails yet easy enough for intermediate skiers to ski on. Blue Square trails arenít extremely raised. They are accepted and well-known trails at most resorts because they provide skiing thatís fun but not scary. Generally groomed, some Blue Square trails have easy moguls or extremely easy glades.

Black diamond (Slope angles ranging from 40% and up)

Difficult trails that are for advanced skiers. Black Diamond trails can be cramped and steep. Other challenges, such as icy conditions, may cause a trail to be marked as a Black Diamond. Most glades and mogul trails are Black Diamonds.

Double Black Diamond

Due to exceptionally steep slopes. Extremely difficult trails that are reserved only for expert skiers. Because of hazards such as an extremely steep slope, difficult moguls, glades, or drop offs, Double Black Diamonds should be approached with caution and only be skied on if one is sure they are advanced and experienced enough to handle the challenge.


Variations such as doubling a symbol to designate increased difficulty, or combining two different symbols to indicate an intermediate difficulty are occasionally used.

Terrain Parks

While not used at all ski resorts, the trails are represented by an orange horizontal oval-like shape. However, most ski resorts add an official rating, so youíll know how challenging the terrain park is.