Saturday's meeting at Uttoxeter and the fixture scheduled for Sedgefield on Sunday have both fallen victim to the cold weather.
Uttoxeter clerk of the course Charlie Moore reports the track to be unraceable due to frost and snow and admits the situation is hopeless.
He said: "We've had to let it go. We have still got two inches of snow on the track with a hard frost forecast. There is not sufficient warmth and moisture in the forecast before Saturday as the forecast rain will come too late. Even if it did come in time, we could then end up waterlogged."
Clerk of the course Phil Tuck was due to inspect the Sedgefield track at 2pm on Thursday but was able to make an earlier call as there is no prospect of sufficient improvement in conditions.
He said: "It's not improved at all and it's a hopeless case really. We are forecast minus 4C tonight and although it stayed above freezing last night, there is so much snow on the track it made no difference. We are forecast more snow on Friday and there is no chance of it improving."
Sunday's card at Fontwell is under threat, with officials planning a 10am inspection on Saturday due to waterlogging.
Clerk of the course Edward Arkell said: "We remain waterlogged in places. We are forecast an overcast, damp day and then a band of snow, and/or rain or sleet, probably a quite heavy one, moving in.
"We are then forecast snow again on Saturday evening so we will have a look on Saturday morning on the basis that if we are not fit to race then, we won't be fit to race on Sunday. We had three inches of snow on the track that melted quite quickly with another half an inch of rain on top.
"The track, like everywhere, has had a hard winter with the volume of rain."
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