Non-operating provincial parks offer limited recreational experiences, fewer/no facilities, and generally no dedicated staff or fee collection. These are generally located in undeveloped wilderness areas.
For a full list of Non-Operating Parks visit: Locate Non-operating Provincial Parks in Ontario
For further information consult Provincial park management direction statements for each park, these may show you where authorized sites are located.
Here is a great break down on camping on Non-Operating Parks in Ontario by TheKasPack.com
To see whether camping may be available at a park. Go to the parks page on OntarioParks.ca and look for the following icons under Facilities/Activities
The site indicates which activities are permitted by highlighting icons in blue. The grey icons mean an activity is not permitted.
This Map lists Non-operating parks that MAY offer free backcounty camping.
Click the icons on the map to view the respective Park's information page and contact info. Use this this index to look up Management Statements for each park.