A yellow warning for ice and snow is in place across Devon and Cornwall, and is scheduled to last until Tuesday.
The Met Office has warned of scattered sleet and snow showers, and icy patches which may cause some travel disruption on Sunday, Monday and into Tuesday morning.
The ice, sleet and snow warnings start at 12:00 GMT on Sunday and run continuously until 11:00 on Tuesday.
Some roads and rail journeys are likely to be affected and there is an increased risk of injuries from slips and falls on icy surfaces.
People are also advised there are also likely to be some icy patches on untreated roads, pavements and cycle paths.
Devon County Council said gritters were out across the county and would be out again early on Monday.
Cornwall Council urged people to travel carefully and allow extra time for their journeys.
