Well, “defined” probably isn’t the right word. This is Alaska after all. But this an important question to consider.
Click on the little hiking boot icon in the sidebar for whichever backcountry trip you’re considering and you’ll see the discussion for that particular level of trip. One boot equals easiest and five boots the most challenging option.
As a general rule I’d suggest rating everything here one notch HIGHER from what you might be used to (assuming you haven’t hiked in Alaska before). If you consider yourself up for an intermediate level hike assume that a trip rated intermediate here will probably be a bit tougher than you’re expecting. Not impossible, but harder than you think.
As I mentioned above, terrain is the biggest factor here and it’s extremely subjective as to what is difficult terrain and what is not.
Some people really struggle walking over a boulder field, and others don’t find it difficult at all. Some people find sidehilling more difficult, or bushwhacking, and so on. But the most common element people struggle with is almost always terrain. Your balance is probably a more important consideration than how miles you run on a treadmill each day in the gym.
One of the best ways to lower a rating is simply give yourself an extra day or 2. Make a 5 day hike a 7 day hike and it’ll much more manageable. Conversely, if you want a challenge give yourself a little less time and you’ll find just about any trip here as challenging as you could want it to be.