For honeybees in the southern US, the middle of January to late February is pollen collecting time. Its impeccable timing, as pollen is exactly what the bees need just before spring. The nutritious pollen is mixed with honey stored from the previous year and fed to growing larvae. Larvae being grown and raised to collect nectar to be used in the following winter. It's an amazing cycle, repeating itself every year.
As a beekeeper, I get to watch bees work tirelessly to collect a rainbow of pollen, funneling it to cells containing the next generations of worker bees. It's a sight worth seeing for your own eyes, because It's an incredible world.
Honey bees tend to have a speciality, working their assigned task until needed in other ways for the colony. These bees specifically fly out to collect pollen; foraging any time the weather is warm enough. Some bees are better at it than others...
These are a couple of our backyard hives working some local trees over for pollen. We don't know what type of tree is producing this bright yellow pollen, but we are glad it is.