From March to November.
How To Identify Brown Banded Carder Bees
These bees are usually a brown colour that can vary all the way to a ginger. Their rear legs are bare and shiny. The Common carder bee also has black hairs on its abdomen.
The most common colour for a carder bee is brown, all carder bees are big fans of tubular flowers. This means you will likely find them around plants like deadnettle, foxglove and any kind of legume flower.