Many people have a lot of little running spiders in spring here in North Carolina. Inside the house right around the foundation of the house and you wonder "Why is this huge population right on my home right now?" Well, infestation begins usually the winter before. Insects likes spiders and crickets and arachnids, and all sorts of other creepy crawlies are looking for a warmer place to live and you heat your home so as things cool off, they gravitate towards the home and towards logs and rocks that they can hide underneath. Your house is like one big log in the middle of the forest with a heater on it, so they pull up into the house over winter. This is an example of some logs that're just laying out amongst the foliage here.
If we flip over the log and look to see what's underneath, we can see lots of decaying organic matter and a spider living comfortably. A pregnant mother wolf spider, as you can see here. Now she is gonna stay out here for a while, but this is going to get cold, she's gonna look for a place a little bit more comfortable which, nine times out of ten, is your home.