Auckland's first region-wide count of the homeless will go ahead on Monday night.
Around 1000 volunteers will count rough sleepers between Wellsford and Waiuku to help work out if we are meeting the needs of people who don't have shelter.
Moira Lawler from Lifewise says it will be hard to count everyone.
"I think we're likely to establish a kind of minimum number… you can't guarantee you've found everyone."
The count will start at 9:30pm, and continue through the early hours of the morning.
- NZ's homelessness the worst in OECD - by far
- Homelessness proves capitalism is a 'blatant failure' - Jacinda Ardern
Ms Lawler says the data will be extremely valuable.
"That will give us a baseline so we have a sense of whether the various things everyone is doing - Government, community organisations, council - whether they're really making a difference."
The Government announced a $100 million plan to combat homelessness in May.