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

Northern4x4
Trail Rating System

The trail ratings were devised by the Alaska Extreme Four Wheelers and the Last Frontier Four Wheelers

11-2Stock to slightly modified (Tires/Lift).
23-4Slightly Modified with mud tires and a suspension lift 31" above tires.
35-6Modified Vehicle Mud Tires, Lift, Traction Device, and 31-33" Mud Tires recommended.
47-8Highly Modified Vehicle Mud Tires, 3" and up Lift, Traction Devices, 32" and up mud tires, Winch highly recommended.
59-10Highly Modified  Aggressive Mud tires, 3" and up Lift, Traction Devices, 33" and up mud tires, Winch is mandatory, expect some vehicle damage, Experienced drivers only.

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.