"But it's the wrong time of year, and they probably don't understand that," McDonald said.
"We've heard stories of backpackers living in tents in orchards. We're getting frosts, it is the middle of winter ... this is not sustainable."
Furthermore 400 international students at the Eastern Institute of Technology were also stranded with no way of getting home and often no work to fund their stay, MacDonald said.
There were similar situations unfolding in Canterbury and the Bay of Plenty as backpackers tried to seek work in other regions, he said.
"It appears to be finally bubbling to the surface. It's like watching a slow train wreck."
The responsibility of Civil Defence was to provide emergency shelter, food and clothing to foreign nationals needing help, but it was not sustainable to be doing this long term, he said.
His staff needed to again focus on planning for emergencies.
"We need more clarity from the government as to who is responsible for looking after them."