I spotted 4 Tundra Swans just south east of Alliston at 2:00 pm today. Sitting alone in a field - muddy but no open water.
Take the Tottenham Road [County Road 10] south from Alliston or north from Tottenham. At the 11th Line, go east. Cross the 10th Side Road, which runs north-south, and continue east 500 meters. The birds are in a field on the north side of the road. The road edge is tree lined but there is open space at the east end of the field.