Pollen?

It's the 30th day of March in Winona MN. The temperature was about 45 degrees F in the beeyard. The sun was on the one surviving hive (Bee Glad...) and a number of bees looked to be bringing in pollen. Except for the crocuses, I have not seen any other flowering plants in the neighborhood. I still would like to think the bees are bringing in healthy food.