Originally posted by Afro Moose:

Start making more workbenches, monsters cant spawn within range of them. So if you make a wall around your settlement put workbenches spaced around the edge of your wall. If its a larger area make sure all land inside your wall is covered. You should have no more monsters then

i know for a fact that mobs keep spawning next to a small hut where i have a workbench.

and they also seem to spawn at fixed points.
it's frustrating.

and they also spawn near hoed terrain. (which is next to the workbench, btw)