A yellow weather warning is in place for some parts of the country with the Met Office there is an increased likelihood of injury from dangerous ice patches.
Forecasters are warning frost, rain, sleet and up to eight inches of snow could batter the UK.
Snowfall is expected in the Peak District, the Pennines and the Cumbrian Fells in the Lake District tonight and into Wednesday.
Snowdonia in Wales as well as the Cairngorms and Southern Uplands in Scotland are also likely to see snow.
The weather warning in place for Scotland and parts of northern England is likely to be extended amid concern over potential "hazardous" conditions.
The Met Office have warned of a risk of hill snow and said northern Wales and northern England may both see flakes settling.
John Hammond, chief meteorologist for Weathertrending, said: "On Tuesday, rain will be arriving across the southwest of the UK.
As it hits the cold air further north, a period of snow is likely for the hills of mid and north Wales; and by Wednesday morning the risk extends to the Peak District, the Pennines, the Cumbrian Fells and the southern Uplands.
"2-5cm is possible to affect the highest communities in these areas, but some of the mountain passes could briefly see as much as 10-15cm."
The Met Office has predicted up to 20cm of snowfall in the Pennines tomorrow overnight, as temperatures drop below freezing.
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