Details on what to do are on the underside of all the rocks.
"The goal of the Civil Defence's involvement in Whanganui Rocks is to raise awareness, especially with kids, and to get people thinking about disaster preparation so they can stay safe during emergencies," Whanganui District Council Emergency management officer Anthony Edwards said.
Everyone in Whanganui can get involved in Whanganui Rocks by getting out and searching for hidden painted rocks around the city, or by painting their own and hiding them for someone else to find.
People can check out some of the rocks being painted and hidden on the Whanganui Rocks Facebook page.