How high can Minecraft spiders jump?

Question

How high can spiders jump, and can they leap up on to a wall and climb from there? For instance, can a spider jump up to the lip in any of these (O is ground, X is wall):

X
        X     XX
  X     XX     X
  XX     X     X
   X     X     X
OOOOOOOOOOOOOOOOOO

Everyone says you need to put a lip on your wall to keep spiders out, but nobody says if there is a minimum height before it is effective.

John the Green · Accepted Answer

I always put my lip just high enough so that I don't bump my head on it (that is, with 2 blocks of air between the ground and the lip). I have watched it stop spiders and have never encountered a spider above the lip. James' answer is correct about the spider AI.

Correct answer by John the Green on June 25, 2021

James · Answer

While they can jump, I am not sure of the height to try and give you a value (The wiki is empty)

What I can speak to is that the spider AI will generally walk forward and then jump up when it needs to, resulting in them being Under the lip and hitting their heads on it. While they can jump up to the lower ones, it would be a timing issue whether or not they made it.

stu700 · Answer

I am making a fighting arena round a spawner and I have made the iron bars 4 high and the spiders can't jump that

Anna · Answer

The minimum height a spider can jump is about 15 blocks high. It doesn't matter about the lip, it does not even work.( or at least when I tried it) so, you should build your building pretty high, if you do not want spiders invading your building.

Answered by Anna on June 25, 2021

How high can Minecraft spiders jump?

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