School buses have been cancelled in Dryden and Vermilion Bay.
The Northwestern Ontario Student Services Consortium says visibility has deteriorated in the area with heavier snow expected.
The Highway bus from Ignace to Upsala has also been grounded.
The Consortium says conditions are good in Sioux Lookout and the town is already out clearing and sanding.
All buses in the Sioux Lookout area are running.
