Reading a Trail Rating: What Green, Blue, Black and 1 to 10 Really Mean

Every trail guide, trailhead sign and mapping app gives you a difficulty rating, and the ratings do not agree with one another. A blue trail at one park may be harder than a black trail at another. A route called a 5 in a Utah guidebook may feel like nothing to a driver who just finished a 5 in California. This is not because the people rating trails are careless or lazy about it. It is because there is no single national standard, and each system is built for its own terrain and its own users.

The simplest systems borrow from ski resorts: green for easiest, blue for intermediate, black for most difficult, sometimes with a double black or red for the extreme end. Managed trail networks such as Hatfield-McCoy in West Virginia and many state trail systems use this approach. It is easy to read at a glance and it works well within a single system where the same people rated every trail. It says very little about what the difficulty actually consists of.

Numeric scales, usually 1 to 10, are more common in the West and in guidebooks. The idea is that a 1 is a graded dirt road any stock vehicle can drive and a 10 is at the limit of what a modified vehicle can do. The Rubicon Trail in California is the route the scale is usually anchored on at the top end. Moab's trails run across most of the scale, with well-known routes sitting anywhere from a 3 to a 10 depending on which one you pick.

What a rating cannot tell you is why a trail is hard. A high number might mean large ledges that need ground clearance and a locking differential, deep sand that needs momentum and low tire pressure, off-camber sections that punish a tall vehicle, or tight trees that stop a wide one. Two trails with the same number can demand entirely different machines and skills. Read the description that goes with the rating, not just the rating.

Ratings are also written for a typical vehicle, and that vehicle differs by region. A guidebook aimed at Jeeps and pickups rates obstacles by what a truck-sized vehicle with a low-range transfer case can do. A side-by-side has a shorter wheelbase and less weight, which helps on ledges, and a lower ride height on some sport models, which does not. A dirt bike can go where neither can. Ask what kind of machine the rating assumes before you trust it.

Conditions move a rating around more than anything else. A trail rated as moderate in dry weather can become impassable after rain, and a rocky climb that is straightforward in the afternoon sun may be icy at dawn in the shoulder season. Spring thaw closes many Midwest trails altogether. Ratings describe the trail in typical conditions, and you have to add the weather yourself. Our trail listings include a season note for this reason.

There is a difference between technical difficulty and consequence. Some trails are hard but forgiving: if you fail an obstacle you roll back and try again. Others are easy but exposed, with a shelf road and a long drop on the outside. Alpine shelf roads in the Rockies are the classic example. A rating that only counts obstacles can undersell a route where a small mistake has a large result. When a description mentions exposure, take it seriously regardless of the number.

A good way to calibrate yourself is to drive a trail whose rating you already know, in the system you plan to use. If you have done a 4 in a particular guidebook and found it comfortable, that book's 5 is a reasonable next step and its 8 is not. Doing the same across systems does not work, because the scales are not the same, and an experienced driver from one region can get into trouble assuming they are.

Managed parks sometimes post a minimum vehicle requirement alongside the rating: a lift, a certain tire size, a winch or a locker. These are there because the park has recovered enough vehicles that did not meet them. Treat them as real. Where a trail requires a permit or has a group size limit, the rating is not the only thing you need to read, and you should confirm the current rules with the managing agency before you go.

Finally, ratings describe the trail, not you. A driver on their first trip to a new area should pick something a step below what their vehicle could handle, because the vehicle is rarely the limiting factor early on. The people who get into trouble are not usually the ones on the hardest routes. They are the ones who assumed a moderate rating meant easy, went alone, and found out what the number was hiding.