The jumps meeting at Fakenham on Thursday is subject to a second early-morning inspection.
Despite temperatures having failed to get as cold as had been forecast, Fakenham officials found the track partially frozen following an 8am inspection on Wednesday.
Another inspection is required at 7am in the morning.
Also on frost alert are officials at Warwick, with an 8am precautionary inspection having been called.
Temperatures could get to as low as minus 2C overnight, with the official going currently soft, heavy in places.
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