Newcastle's big Saturday meeting is in serious doubt with officials calling an 0800 GMT inspection for Friday.
But with more than five inches of snow laying on top of the frost covers, the prospects of racing are receding.
Meanwhile Newbury is hopeful its meeting, which is set to see Denman bid for an historic third Hennessy Gold Cup win, will survive the frost.
Binocular was set to make his seasonal return at Newcastle, and take on exciting young hurdler Peddlers Cross.
Newcastle clerk of the course James Armstrong said: "If the weather continues as it has in the last 24 hours we may look to bring things forward, but at the moment we're holding an inspection at 8am on Friday."
