For 20 minutes, Zahn waved and blew kisses as dozens of cars and trucks rolled by her window at the Oak Hills Living Center in this southern Minnesota city.
It was the biggest surprise of her life, she said afterward — which is quite a statement, considering that it was her 112th birthday.
Zahn, the oldest living Minnesotan, was celebrated by friends and family, including a large assortment of her six children, 23 grandchildren, 50 great-grandchildren and three great-great-grandchildren.
From vehicles festooned with balloons and signs came shouts of, "We love you, Grandma!" as five police cars with flashing lights led the way.
The outdoor birthday celebration was forced by the novel coronavirus pandemic, which forced a ban on visitors to the nursing home where Zahn has lived for the past three years.
But her spirit was reflected in one sign that read, "Erna 112 > COVID-19."
"My gosh, she loved it!" said Cindee Krzmarzick, Oak Hills' enrichment coordinator, who organized the parade and sat at Zahn's side during the procession. "She kept saying she was overwhelmed."
Zahn is sharp and recognized everyone in the parade, Krzmarzick said: "She's incredible. She's an inspiration to us all."