Do bumblebee's sting?
Yes, they can sting but will do so only if threatened.
Queen and worker bumblebees can sting. Unlike a honey bee's stinger, a bumblebee's stinger lacks barbs, so it can sting repeatedly without injuring itself. Bumblebee species are not normally aggressive, but will sting in defence of their nest, or if harmed. Female cuckoo bumblebees will aggressively attack host colony members, and sting the host queen, but will ignore other animals (e.g. humans) unless disturbed. hope this helps :)
Bumblebees are large, hairy social insects with a lazy buzz and clumsy, bumbling flight. Many of them are black and yellow, and along with ladybirds and butterflies are perhaps the only insects that almost everyone likes. Queen and worker bumblebees can sting, and the photograph above right shows the extended sting of a Bombus lapidarius queen. You don't often see stings as bumblebees are reluctant to use them.
Answer Generally Bumblebees are not aggressive in nature and great for pollinating your gardens. If they aren't near the house then leave them alone. Bumblebees are heavier in body and slow (almost dormant state) and aren't likely to sting you unless you put pressure on them. I deal with them all the time when I garden and haven't been stung once. The only problem with Bumblebees in when Autumn comes and they really become dormant…