I'm in the Seattle area and I'm used to seeing orange colored pollen come in - although I'm not sure what plant(s) it comes from. But today I noticed a darker, kind of gray colored pollen. I've never notice that before.
Here is NW Florida, they recently started bringing in a grey white pollen. Changes in color are normal. I don't recall what it is locally and would have no idea for your region, but non-yellow pollen happens.
Gray pollen in Seattle area now is most likely from the blackberry, our major nectar source, which is now blooming everywhere. Orange pollens my bees recently brought in were Japanese snowbell and cistus (I did ID under microscope), but yours could be false dandelion, multiflora rose, or other plants, depending on what you have nearby.
A forum community dedicated to beekeeping, bee owners and enthusiasts. Come join the discussion about breeding, honey production, health, behavior, hives, housing, adopting, care, classifieds, and more!