Friday's cards at Doncaster and Huntingdon are under threat from the cold snap.
Officials at Doncaster have called a 10am inspection on Wednesday and report five inches of snow on the track ahead of their two-day fixture, which features the Sky Bet Chase on Saturday.
Clerk of the course Roderick Duncan told At The Races on Monday: "The forecast I looked at this morning for Saturday gave us a little bit of hope. It depends which forecast you look at but there are glimmers of hope.
"The forecast for Thursday night into Friday is a little bit difficult.
"We haven't got covers on. We've got a natural cover on it of snow and we'll see where that goes."
Huntingdon's meeting must pass a 9.30am inspection on Wednesday.
The track is currently covered by four inches of snow with more forecast. To compound matters, freezing temperatures are expected overnight.
Clerk of the course Sulekha Varma said: "We are holding a watching brief there and hope things improve in time with the meeting being on Friday. There is at least two to three inches of snow across the site which is enough to cause a problem."
1 November 2014Farraaj third in Mackinnon
Now or Never for Dettori
Henderson all out for Ascot score
Lady proves a champ
Dettori works Breeders' Cup magic
Conti chasing second Charlie Hall
Filleule faces Champion test
Little King wears Down Royal crown
Nicholls goes on Charm offensive
Fishers angling for Wetherby prize
Lavelle star Bec in business
31 October 2014Day to remember for Ellison
Johnson remains under observation
Terror scares Newmarket rivals
Terror scares off Newmarket rivals
Sgt far from Reckless at Uttoxeter
Weld out to break new ground
Osborne ready to 'roll the dice'
Dank bids to sign off on a high
Turf glory in sight for Telescope
Red Ed upbeat about Cadeaux
Aktabantay out of Breeders' Cup
Tearless secures Good Friday ticket
Overnight stay for Johnson
Crawford banks on Izzini progress
Toast could make Spencer think
Road charts route to Royal riches
Grece excels at Saint-Cloud
Hawk given Greatwood option
Hannon: Early speed key for Osaila
30 October 2014Tearless takes Lingfield honours
Johnson taken to hospital
Royal summons for Apache
Bowe takes aim at WKD bullseye
Hootenanny 'smoking' for BC mission
Avenue roads lead to Newmarket
Shu to be kept busy
Scu sweet on Sensation Ascot raid
Murtagh succumbs to Cup charms
Dandino to stay in Australia
Glance denied Mackinnon defence
Bailey ace rules Supreme at Taunton
O'Brien hit by Magician blow
Diablo in big-race picture
Buckley raises Toast to Osborne
Pastille seeking four-timer
Conti all set for Charlie Hall
Barnes out to storm Saint-Cloud
Williams issues Buywise warning
Lynam reveals Slade stalls fears
29 October 2014Lame Magician out of Breeders' Cup
Diablo in big-race picture
Mullins enters strong Hennessy team
Damaged hock behind Estid reverse
Eckhart team rocked by injury blow
Hunt Ball makes Power play
Morgiana a T bone of contention
Kirby ponders Buttons French raid
Glance camp turn to Williams
Wohler trusts 'professional' Moore
Red alert to Cup challenge
Head targets more Mile glory
Mile hope Toronado in 'great form'
Telescope camp banking on Moore
Twiston-Davies link excites Moore
Flying third to Bob on hurdling bow
Harden to test top staying waters
Godolphin take share in Belardo
Mullins has big guns at Down Royal
Annacotty set for Kempton return
Powell and Bradley cleared