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TRAIL RATINGS
Trail ratings can vary widely, subjective by level of experience and vehicle equipment. Consulting or accompanying a safe, experienced off-roader is advisable before attempting any new trail. Following are the two most commonly used trail rating systems:
0 to 5 Scale
0 to 5 Scale, used primarily in Arizona and Utah. Credit: AZ Virtual Jeep Club (AZVJC.org).
0.0 - Highways: These are paved roads suitable for everyday traffic.
0.5 - Back Roads: These are paved roads that may have filled or unfilled potholes. Typical paved county roads.
1.0 - Maintained Dirt Roads: These roads are graded or maintained year round. Typical non-paved county roads.
1.5 - Semi-Maintained Dirt Roads: These roads are occasionally graded or maintained. They may cross sandy washes and sections may be rough (washboards).
2.0 - Easy 2WD/4WD: Features trails with obstacles that are easy to navigate. In optimum weather conditions, these trails may not require the continual use of four-wheel drive (4WD).
2.5 - Easy 4WD: Moderately demanding trails on which 4WD will be required. You may encounter a wide variety of challenges (Potholes, minor washouts, medium size rocks, and mud holes) on these trails. Higher ground clearance and Off-Road tires are recommended.
3.0 - Standard 4WD trail: Demanding trails on which 4WD is required. You will encounter a variety of more difficult challenges (loose rocks, large potholes, steep inclines, and large rocks) on these trails. Possible with stock 4WD vehicle, however, recommend traction device (limited slip) in rear differential, aggressive tread and low air pressure. Higher than stock ground clearance is advisable. Low range gears used often. Moderate experience and driving skill advised. Likely paint damage, possible rocker-panel damage.
3.5 - Challenging 4WD trail: Challenging trails on which low range 4WD is required. You will encounter a variety of more difficult challenges (loose rocks, large potholes, steep inclines, and large rocks) on these trails. Not recommended with stock 4WD vehicle. Traction device (limited slip) in rear differential, aggressive tread and low air pressure highly recommended. Higher than stock ground clearance is advisable. Moderate experience and driving skill advised. Likely paint damage, possible rocker-panel damage.
4.0 - Difficult trail: These trails traverse very rugged terrain; low-range 4WD is required. Higher than stock ground clearance is required. Aggressive tread and low air pressure are required. Traction Devices (Lockers or limited-slip) in the differentials (front and rear), lift, and larger tires are highly recommended. These trails require above average Off-Road driving skills. High-Lift jacks and winches would also be helpful. There will likely be paint damage and possible vehicle body and/or mechanical damage.
4.5 - Extreme trail: These trails cross extremely rugged terrain with very steep inclines, large boulders, and potentially dangerous situations. These trails require modified vehicles, including lift, lockers, and over-sized tires. A High level of Off-Road driving skill is required. There will likely be paint damage, possible vehicle body and/or mechanical damage. There are possibilities of rollovers. Winches are recommended.
5.0 - Impassable trail: These trails are for the extreme four-wheeler only. These trails require highly modified vehicles, including lift, excellent articulation, lockers front and rear, large tires with aggressive tread, winches, high lift jacks. A High level of Off-Road driving skill is required. Paint damage is virtually guaranteed, body and/or mechanical damage is very likely. Rollovers will be more common on these trails and a winch will be used on at least one obstacle.
For those using a 1 to 10 scale, for example Jeep Jamboree, this is the most thorough scale we have found. Credit: Colorado Association of 4wd Clubs www.hightrails.org
Rating: 1
Graded dirt road. Dry, or less than 3" water crossing depth. Gentle grades. 2WD under all conditions except snow. No width problems, two vehicles wide.
Rating: 2
Dirt road. Dry, or less than 3" water crossing depth. Some ruts. Slight grades, up to 10 degrees. 2WD under most conditions. Rain or snow may make 4WD necessary. Usually one and a half to two vehicles wide.
Rating: 3
Dirt road. Rutted, washes, or gulches. Water crossings up to 6" depth. Passable mud. Grades up to 10 degrees. Small rocks or holes. 4WD recommended but 2WD possible under good conditions and with adequate ground clearance and skill. No width problems for any normal vehicle. Vehicle passing spots frequently available if less than two vehicles wide.
Rating: 4
Rutted and/or rocky road. No shelves but rocks to 9". Water crossings usually less than hub deep. Passable mud. Grades moderate, up to 15 degrees. Side hill moderate up to 15 degrees. 4WD under most conditions. No width problems, vehicle passing spots frequently available if less than two vehicles wide.
Rating: 5
Rutted and/or rocky road. No shelves. Rocks up to 12" and water crossings up to 12" with possible currents. Passable mud. Moderate grades to 15 degrees. 6" holes. Side hill to 20 degrees. 4WD required. No width problems.
Rating: 6
Quite rocky or deep ruts. Rocks to 12" and frequent. Water crossings may exceed hub depth with strong currents. Shelves to 6". Mud may require checking before proceeding. Moderate grades to 20 degrees. Sidehill may approach 30 degrees. 4WD necessary and second attempts may be required with stock vehicles. Caution may be required with wider vehicles.
Rating: 7
Rocks frequent and large, 12" and may exceed hub height. Holes frequent or deep (12"). Shelves to 9". Mud 8" deep and may be present on uphill sections. Grades to 25 degrees and sidehill to 30 degrees. Water crossings to 18" and may have strong currents. 1-1/2 vehicles wide. 4WD required. Driver experience helpful.
Rating: 8
Heavy rock and/or severe ruts. Rocks exceeding hub height frequent. Shelves to 12". Deep mud or uphill mud sections. Steep grades to 25 degrees and can be loose or rocky. Water crossings may exceed 30" in depth. Side hill to 30 degrees. One vehicle wide. Body damage possible. Experience needed. Vehicle Modifications helpful.
Rating: 9
Severe rock over 15". Frequent deep holes over 15". Shelves over 15". Mud bog conditions (long, deep, no form bottom). Over 30" water crossings with strong currents. Steep grades over 30 degrees. Sidehill over 30 degrees. May not be passable by stock vehicles. Experience essential. Body damage, mechanical breakdown, rollover probable. Extreme caution required.
Rating: 10
Severe conditions. Extreme caution recommended. Impassable by stock vehicles. Winching required. Trail building necessary. May be impassable. Impassable under anything but ideal conditions. Vehicle damage probable. Personal injury possible. Extreme caution necessary.
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