Please read carefully before attempting any FunTreks trail.


SUV or Pickup Truck

This symbol represents a street-licensed stock sport utility vehicle or pickup truck with 4-wheel-drive. Minimum ground clearance should be 7” to 8” at low point of vehicle and about a foot at rocker panel. Low range is recommended for rocky, steep and high elevation trails. More aggressive models will have higher clearance and factory off-road enhancements such as skid plates, tow points and differential lockers. Longer and wider vehicles require more ground clearance. In addition to vehicle capability and size, other factors such as driver’s skill, tires and tolerance for damage greatly affect which trails can be driven. Every vehicle is different and every trail is different. Judgment as to whether a vehicle is capable of traversing a specific trail lies solely with the owner of the vehicle. Read each trail description carefully.


Hard-core Modified.

This symbol represents street-licensed vehicles that have been significantly modified for difficult hard-core situations. Most modifications are custom, but there are specific factory models that meet hardcore standards. Minimal tire size starts at 32″, but 33″ to 37″, is more typical. Lifts of 3″ or more, heavy-duty skid plates and accessories, increased articulation and differential lockers are the norm. Many additional modifications are possible. These vehicles should be able to handle all trails in our books. Extreme trails require maximum modifications.


60″-Wide Side-by-Sides.

This symbol represents what are commonly called UTVs, or Utility Terrain Vehicles. They are generally considered unlicensed vehicles; however, some states allow licensing if modified for street use. Out-of-state street licensing is not recognized in Colorado, but a few local jurisdictions allow limited use on some streets. For the purposes of our books, UTV side-by-sides are considered unlicensed vehicles. Capability of these vehicles ranges from simple utility uses on ranches and farms to extreme modifications for hard-core trail use. Their width prohibits use on 50″ ATV trails. For our books, 4-wheel-drive capability is assumed. When you see this symbol at the top of the page, it primarily indicates the trail allows unlicensed vehicles. The ratings of easy, moderate and difficult are open to far greater interpretation. Only the operator can determine the appropriateness of the trail.


50″-Wide ATVs and Side-by-Sides.

This symbol represents ATVs, or All Terrain Vehicles, not wider than 50″. It also represents the newest craze—50″-wide side-by-sides (e.g., the “RZR”). Both are generally considered unlicensed vehicles; however, some states allow licensing if modified for street use. Out-of-state street licensing is not recognized in Colorado, but a few local jurisdictions allow limited use on some streets. For the purposes of our books they are considered unlicensed vehicles. These vehicles range in size from tiny 2WD machines for kids to large 4WD machines for adults. Generally, trails in our books are for 4-wheel-drive ATVs, but we know some 2-wheel drive units can be equally capable. When you see this symbol at the top of the page, it primarily indicates the trail allows unlicensed vehicles. The ratings of easy, moderate and difficult are open to far greater interpretation. Only the operator can determine the appropriateness of the trail.


Dirt Bikes (Unlicensed).

This symbol represents unlicensed dirt bikes only. Licensed, dual-purpose bikes can ride all trails in our books. The symbol does not mean the trail is a single-track trail; it only means unlicensed dirt bikes are allowed. All trails in our 4×4 books are wide enough for SUVs and Jeeps, but they are still great rides for dirt bikes. Some trails connect to 50″-wide and single track trails. These narrower trails are specified on Motor Vehicle Use Maps. Easy, moderate and difficult ratings do not apply to dirt bikes, but they do provide general information of what to expect. In addition, driving-time estimates will be less for dirt bikes.

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