Is this base location immune to raids?

My Base has become a castle on the wall, by the wheelbarrow, next to the field station in the wall, at one point I had a larva raid so I glided down to my Milk Molar Bottle base to distract them but when I got there the larva sign was at my castle. Wanting to fight them I reloaded a save and they never showed. Since I never saw the Larva, i was wondering if they have a way up there (I have a clover roof staircase ontop the rock opposite the castle), or worse for wear can wasps and mosquitos reach that high? If so I need to build some turrets.