You or a neighbor nearby feed birds? I had moths in the house last year like crazy and couldn't figure out where they were coming from. I read a lot of stuff all the time and just happened to be reading an article on long term storage of dry goods. That's were I learned that it's not uncommon for eggs/larvae to be attached to dry goods. Than it clicked that's why I see them in the entryway the most because that's where I'd leave the birdfeed to make it handy to get at everyday. Despite it kept my cat busy chasing them around I started keeping the bag closed to be sure that was the source. Sure enough the moth situation started declining.

I know what you mean being anxious for spring. One year, several years back I was walking through a park and decided to sit at a bench and just watch the water flowing round the ice. I happened to look down and there was an ant climbing up what was left of a snow mound by the river. Now if that wasn't a early sign of spring I told myself I don't know what is. lol.