The woman, whose name was not released, was attacked Friday by bees coming from the wall of a storage building outside her home, said Fire Department Capt. Paul McDonough.
A handyman sprayed her with water from a hose until the bees turned on him. He ran and called emergency services.
Firefighters found the woman lying face down and unconscious in the street. They sprayed the bees with foam, then took her to the hospital, McDonough said.
She was out of intensive care and in fair condition Friday night.
"She was stung 400 times," said University Medical Center clinical supervisor Kim Hilty. "Everyone was surprised how well she's doing."