Musselburgh and Chepstow have been forced to call inspections on Thursday ahead of Friday's meetings.
Musselburgh, set for am 8am check, is currently frozen after temperatures dipped to -5C overnight with little hope of it rising above much freezing throughout the day. The one hope is that temperatures on Thursday could reach 3C, although snow could then move in.
General manager Bill Farnsworth said on Wednesday morning: "The track is frozen. It was -5C last night, it will get up to +2C today but the frost won't move at all and then it will be -1C tonight. That isn't as bad but it isn't going to make it any better.
"Tomorrow it should be +3C and then there is a great deal of uncertainty about the forecast for Thursday night into Friday. We have high pressure over us at the moment and then we'll have a weather front coming over from the west. If that front doesn't get to us it will remain very cold and the track will still be frozen on Friday.
"If it does come over us, the warm air could meet the cold air about midday and we will get a big dump of snow. There is a chance it may move over us completely in which case we will get rain not snow and temperatures warm up a bit sooner."
Chepstow is also under threat from the cold snap with an inspection called for midday. The course is frozen in places and there is be the added problem of snow being forecast.
"We are frost affected and we are frozen in places. It's not rock solid everywhere but there is enough frost underneath the covers as well mainly because it was -3.5C overnight," said clerk of the course Keith Ottesen.
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