Huntingdon’s St Stephen's Day meeting hinges on a 12pm inspection on Christmas Eve.
Although the entire course has been covered in fleece since last Thursday, there is still an element of doubt about the fixture going ahead.
Clerk of the course Andrew Morris explained: “The fleece covers have done a fantastic job, but having had severe frosts there is now frost underneath the covers.
“The forecast is for marginal improvement in temperature but, at this stage, it would be hard to be confident it would be enough to thaw parts of the ground.
“That said, any decision taken before Christmas Eve would be premature.”