Kathy, mine are busy too, light yellow. I am thinking that it is the alder & pussywillow. I see the alder dealies at the top of the hill are about the same color now as the pollen they are bringing in. Yesterday was beautiful, tons & tons of my bees out. It has been pleasant here the last few days, tshirt yesterday for short jaunts into the yard..not long though as the chill gets to you! J