De klimroute heeft een moeilijkheidsgraad.

Because route is a de-word in Dutch, and the compound klimroute keeps the gender of its final part.

A useful rule is:

• in Dutch compounds, the last element usually determines
  • the grammatical gender
  • the plural form
  • the basic type of noun

So:

• de route
• therefore de klimroute

This is very common in Dutch compounds.

Klimroute is a compound noun:

• klim = climb / climbing
• route = route

So klimroute literally means climbing route.

In Dutch, compounds are usually written as one word, much more often than in English. So where English might write climbing route, Dutch normally writes klimroute.

Dutch often uses hebben (to have) when talking about a feature, property, or characteristic.

So:

• De klimroute heeft een moeilijkheidsgraad. = The climbing route has a difficulty level / rating.

This is natural Dutch. English can sometimes also say has, but Dutch uses this structure very comfortably for describing attributes.

If you used is, you would need a different structure, for example:

• De klimroute is moeilijk. = The climbing route is difficult.

That changes the meaning slightly:

• heeft een moeilijkheidsgraad focuses on the existence of a rating/grade
• is moeilijk directly describes it as difficult

It is another compound noun:

• moeilijkheid = difficulty
• graad = degree / grade / level

So moeilijkheidsgraad means degree of difficulty, difficulty level, or difficulty rating.

This is a good example of how Dutch often builds longer concepts by combining nouns into a single word.

Because moeilijkheidsgraad is a singular countable noun here.

• een moeilijkheidsgraad = a difficulty level / a difficulty rating

The sentence is not saying which exact rating it is, only that the route has one. That is why the indefinite article een is used.

Compare:

• De klimroute heeft een moeilijkheidsgraad.
  The route has a difficulty rating.

• De klimroute heeft moeilijkheidsgraad 6.
  This sounds more technical and specific, like a named grade or number.

Because Dutch main clauses usually follow the V2 rule: the finite verb comes in the second position.

Here the sentence is:

• De klimroute = first element
• heeft = finite verb in second position
• een moeilijkheidsgraad = the rest

So the normal pattern is:

• Subject + verb + rest

If you move another element to the front, the verb still stays second:

• Vandaag heeft de klimroute een moeilijkheidsgraad.

That is a very important Dutch sentence pattern.

In a subordinate clause, the finite verb usually moves toward the end.

Main clause:

• De klimroute heeft een moeilijkheidsgraad.

Subordinate clause:

• Ik weet dat de klimroute een moeilijkheidsgraad heeft. = I know that the climbing route has a difficulty rating.

So that is a key contrast:

• main clause: heeft near the front
• subordinate clause: heeft at the end

You would make both the subject and the verb plural:

• De klimroutes hebben een moeilijkheidsgraad.

Breakdown:

• de klimroute → de klimroutes
• heeft → hebben

If you want to emphasize that the routes may have different ratings, you could also say:

• De klimroutes hebben verschillende moeilijkheidsgraden. = The climbing routes have different difficulty levels.

Notice the plural of moeilijkheidsgraad:

• singular: moeilijkheidsgraad
• plural: moeilijkheidsgraden

Heeft is pronounced roughly like hayft, with a long vowel.

A few helpful points:

• ee is a long vowel, somewhat like the vowel in English say, but not exactly the same
• f is just f
• t is pronounced clearly at the end

Also remember that heeft is the third-person singular form of hebben:

• ik heb
• jij hebt
• hij/zij/het heeft

It is not strange or overly formal, but it is a fairly technical or precise word.

You are likely to see it in contexts like:

• climbing
• sports
• games
• tests
• official descriptions
• manuals

In everyday speech, people might sometimes use simpler wording depending on the context, such as:

• hoe moeilijk het is = how difficult it is
• de moeilijkheid = the difficulty
• het niveau = the level

But moeilijkheidsgraad is a perfectly normal and useful word.

Yes, that is possible, but it is less direct and sounds more formal or descriptive.

Compare:

• De klimroute heeft een moeilijkheidsgraad. = straightforward, natural

• De klimroute is van een bepaalde moeilijkheidsgraad. = more formal, more abstract

Usually, Dutch prefers the simpler heeft structure unless there is a special reason to be more formal.

Yes — this sentence teaches two very common Dutch patterns.

1. Compound nouns are often written as one word

• klimroute
• moeilijkheidsgraad

This is one of the biggest differences from English spelling.

2. The last part of a compound is the head It determines the basic noun properties:

• de klimroute because de route
• plural klimroutes because routes
• de moeilijkheidsgraad because de graad
• plural moeilijkheidsgraden because graden

If you remember that the final element is usually the most important one grammatically, many Dutch compounds become much easier to understand.