Here in Ontario, spring hasn't quite sprung yet. It's been a cold and dragged out season with nothing much in bloom or budding at the moment (except for some crocuses and snowdrops). I went through the winter with two deep supers - topped by an empty super (stuffed with pillows for insulation). I left an upper entrance available to them for air circulation by flipping over my inner cover. I've taken out the pillows, un-insulated the hive and added a couple of frames of honey for them to snack on until there's something better out there. Anyway, I noticed that the bees are very busy using the upper entrance almost exclusively. The lower entrance has pretty much nothing going on. Bees are coming in with some pollen - very light coloured, not sure what it is. My question is this: should I close up the upper entrance (by flipping the inner cover over)? And furthermore, should I reverse the supers (I think I did this last year) top to bottom and vice versa? It looks to me like they've all moved upstairs and abandoned the bottom box altogether.
It's a bit early for me to do anything drastic with them, I realize. But I'd like to know what I ought to be doing in the next few weeks, if we ever get spring weather at all.