4x4 Trail Info
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Rating Systems:

4x4TrailInfo
Arizona
Arizona Land Rover Rally
ASA4WDC
AZ Rockcrawler.com
AZVJC
BadAss
Black Hills 4 Wheelers
Black Hills Jeeps
C.O.R.E.
CA Parks
Californiajeeper.com
Colorado
DVO
Expeditions West
Extreme4x4
GLFWDA
Jeep Jamboree
JonFund
Massey/Wilson
Moab
Nevada
Northern4x4
ORN
Sedona
SITR
Tellico
TTORA - NorCal
USFS
Vermont
Wells
Yuma

Extreme4x4
Trail Rating System

System used by Extreme4x4.com.

Circle0-4CIRCLE - EASY: Stock four-wheel drive vehicles of any kind can travel a circle-rated trail.
Square5-8SQUARE - MODERATE: Four-wheel drive needed, as well as some driving skill.  Larger tires and a traction-aid in a differential will make square-rated trails easy.
Diamond9DIAMOND - DIFFICULT: Modified 4x4's required. Locking differentials, larger tires and suspension modifications, as well as good driving, will stand you in good stead on these roads and trails (a diamond-rated trail is equal to the old 4+-rating, so don't think a diamond trail is going to be easy).
Double Diamond10DOUBLE DIAMOND - EXTREME: These are the ones we like. Well-modified 4x4's and experienced drivers MAY be able to get through these roads and trails. Body and mechanical damage likely.

Note: Trail ratings are highly subjective. A trail that is easy for an experienced driver with a highly modified vehicle may be impassable for a novice driver in a stock vehicle. Weather conditions may also significantly affect the difficulty of a trail. Also, the difficulty of a trail may change over time, as trail use, weather, and maintenance modify the trail. Always check with the managing organization and/or recent users before planning a trip on a trail and scout ahead on foot if you are not sure of current conditions.