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

ORN
Trail Rating System

System used on 4x4wire.com.

2WD Easy0Graded dirt or gravel road.
Vehicles: Any vehicle, including passenger cars.
4WD Easy1Unimproved dirt road, 4wd and extra clearance may or may not be needed, street tires ok.
Vehicles: Any 4wd, high-clearance pickup trucks with 2wd.
4wd Easy +24wd needed, some low range, suitable for novice drivers, street tires ok.
Vehicles: Any 4wd, including stock SUVs.
4WD Moderate34wd low range required, difficult terrain, some steep grades but no major rock obstacles, trail tires needed but stock suspension ok, challenge for novice drivers.
Vehicles: Any modified 4wd, stock SUVs with trail tires.
4WD Challenging4Difficult trail, with obstacles, can be done with a stock vehicle with a very experienced driver but not recommended. This is the limit of a stock SUV. Occasional off-camber situations, some steep grades, may be water crossings or sand hazards.
Vehicles: 31 inch tires, at least a mild lift, rear locker or limited slip.
4WD Hard5Difficult trail. Grades and off-camber situations may exceed 25 degrees, water crossings 2 feet deep, lots of rock crawling, body damage possible.
Vehicles: Modified with lift, hard locker, 31 inch tires minimum.
4WD Hard+6Tough trail. Lots of rocks, grades and off-camber situations may exceed 30 degrees, winch may be needed. Body damage or equipment failures likely.
Vehicles: 2 to 4 inch lift, 33" tires, locker in rear, limited slip or locker in front, winch, extra gears.
4WD Extreme9Very tough trail. Lots of rocks, grades and off-camber situations may exceed 30 degrees, winch may be needed. Body damage or equipment failures likely.
Vehicles: 4 inch lift or more, 35" or mre tires, lockers front and rear, winch, extra gears.

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.