The Bureau of Meteorology has forecast a top of just five degrees Celsius for Orange, following an overnight low of one.

But the deep freeze is also forecast to bring the biggest dump of snow the Tablelands has seen this season with falls expected above 800 metres.

Orange's altitude is listed at 863 metres, with Mount Canobolas's summit at 1395 metres.

Snow is expected to start falling around 7am and again at 4pm, and residents can expect to see a wide band of snow across the Tablelands stretching from the western edges of Orange and as far east as Katoomba.

Areas likely to receive snow are Oberon, Jenolan Caves, Blayney, Orange and Yetholme which is located midway between Bathurst and Lithgow.

Snow is also expected for areas above 900 metres in the Snowy Mountains and South West slopes, as well as the Central and Northern Tablelands.

The conditions are also likely to make it hazardous on the roads and motorists are warned to slow down and beware of black ice.

A spokesperson for NSW Roads and Maritime Service said areas around Jindabyne, Adaminaby, Cooma, Batlow, Orange, Bathurst, Lithgow, Oberon, Blayney, Walcha, Armidale, Guyra and the Blue Mountains were most likely to be impacted by the statewide cold snap.

There is more possible snow forecast for high areas above 1000 metres on Tuesday.