Wednesday's meetings at Kempton Park and Ayr are subject to inspections on raceday morning.
Officials at the Sunbury circuit will assess conditions at 10am as up to four millimetres of snow has been forecast on Tuesday evening. The course's fixtures on Sunday and Monday were abandoned due to ice crystals on the surface of the track.
Officials at Ayr have called a precautionary inspection for 7.30am as frost is forecast tonight.
Clerk of the course Emma Marley said: "The temperature dropped to -0.5C last night after a maximum of 2C yesterday. We have had 1.5 millimetres of rain, sleet and snow over the past 24 hours. There is a light dusting, but there is no snow lying on the track.
"We are OK this morning, but we are forecast a sharp frost tonight and on that basis we have to inspect in the morning."
13 May 2013
Fabre confirms Ocovango for EpsomAspect on route to big things
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Freedom steps into chasing ranks
Lucky thirteen in line for Lockinge
Galway beckons for Swinton hero
Sajjhaa set for late return
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12 May 2013
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Ektihaam storms to Buckhounds win
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11 May 2013
Felix foot-perfect on fencing debutCavalryman leads Cup charge
Ramsa ready to stand Trial
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Swift return doesn't bother Moran
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Marengo ready to do battle
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10 May 2013
Telescope focus is on DanteBlinkers considered for Guarantee#
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Ascot welcomes a couple of Guests