A CHICAGO BUMBLE BEE IN APRIL
The first band on the abdomen though partially blocked from view is yellow in all three pictures. There is a black circle on the backside center.
Black fuzzy pile covers the rest of the abdominal bands.
I'm thinking this is an awakened overwintered Queen bombus impatien collecting nectar and pollen until the first worker bees are old enough to take over. Then she will mostly remain in the nest laying eggs. Maybe she spent the winter somewhere here in the garden. I would like to think so.
Check out Beespotter where bumble bee and honey bee sightings in Illinois can be recorded. You enter location, pictures and a guess at species (there are pictures and drawings to help) although an expert will verify and let you know.
BEE PHOTOS AT UIUC
save garden bumble bees pdf
bumble bees pdf