Wednesday’s meeting at Newcastle will need to pass a 2pm inspection tomorrow as the course is currently covered in snow.
The snow fell on Friday evening and after temperatures dipped below freezing on successive nights, it has still not shifted.
Temperatures are due to rise but another frost is forecast for Tuesday evening.
Clerk of the course James Armstrong said: “We had three to four inches of snow on Friday night into Saturday and we have a proper covering.
“It has not shifted for two days and even though we had strong sun yesterday, it was never above 1C or 2C.
“We are forecast 3C today. It is 1C at the moment and tonight it should be 2C with warmer air hopefully coming which should help shift it.
“We should know by 2pm tomorrow but the worry is Tuesday night into Wednesday, we are forecast more frost so tomorrow’s inspection might prove inconclusive.”