Tuesday's meeting at Uttoxeter has been abandoned while Ayr inspect at 9am.
Uttoxeter Clerk of the course Charlie Moore announced an 8am inspection this morning after a wintry weekend left the track covered by three inches of snow.
And with the situation not expected to improve by raceday - it could even get to as low as minus 10C overnight - Moore said there was "no chance of any recovery" and made a swift decision to call off the fixture.
The meeting at Ayr must pass a 9am precautionary inspection on raceday morning.
Temperatures dropped to minus 6C within the last 24 hours, but the track is at least covered by frost sheets.
Cold weather is likely to be prevalent over the next few days, with a forecast low of minus 5C on Monday.
Ayr clerk of the course Graeme Anderson said in a statement that it could "get 1C or 2C by midday" on Tuesday.
Meanwhile, the jumps meeting at Leicester on Wednesday needs to pass a 7.30am inspection on Tuesday morning.
With the course covered "with 2-3 inches of snow", clerk of the course Jimmy Stevenson needs to see a marked improvement within the next few days.
A statement issued by Leicester read: "We are currently unraceable with snow on the track, and will review the situation 7.30am Tuesday morning with an updated forecast.
"All shaded areas are covered with frost sheets."
Hexham has announced a 7.30am inspection on Tuesday ahead of Wednesday's National Hunt meeting.
The Northumberland venue missed the most severe wintry showers that this weekend afflicted large parts of the country, but the track is still "partially frozen" after overnight temperatures dropped to as low as minus 6C.
There is a likelihood of slightly warmer weather, but a statement issued by the Hexham executive said "higher temperatures than forecast are required to assist a thaw".
