Officials at Leicester will hold an inspection at 8am in the morning ahead of Wednesday's fixture.
Clerk of the course Jimmy Stevenson said: "It could be a tricky morning, the forecast doesn't look brilliant with a severe frost.
"We had a minus 2C last night and could probably have got away with it by waiting a bit, but tonight could be a different story."
Wednesday's meeting at Hexham is also subject to a raceday inspection at 8am due to the threat of frost.
Clerk of the course James Armstrong said: "We dropped to minus 1C last night and it's just about raceable now, we had little flurry of snow earlier.
"The forecast for tonight is that little bit colder, around minus 2C, and daytime temperatures might struggle to get above 3C at best, so we need to keep a close eye on it and keep everyone in the picture."
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