Warwick will hold a precautionary inspection at 7am on Thursday for their meeting in the afternoon.
The track were able to race as planned on Wednesday after passing a similar check but with the forecast suggesting temperatures could reach -3C overnight, they will look again.
Southwell are also monitoring conditions ahead of their all-weather fixture. Heavy snow forced them to abandon Tuesday's meeting and they warned on Wednesday morning that were some ice particles present in the surface.
A precautionary inspection is possible with another sharp overnight frost forecast.
Wednesday's card at Hexham was the latest victim of the current cold snap.
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