Her granddaughter, Sara Byrne, also a Syracuse resident, shared video of the moment on Instagram where it was viewed by thousands.
She went on, "We were just giving her well wishes, letting her know we were thinking about her."
Katie Byrne has 7 sons, 22 grandchildren and 29 great-grandchildren. Her 95th birthday party was canceled due to the COVID-19 crisis and has been keeping a safe distance from others.
Sara Byrne and her cousin, Caitlin Byrne, along with 18 other family members stood on Katie's lawn holding signs to celebrate her special day.
Sara said her grandmother was thrilled with the surprise.