The meetings at Kempton and Lingfield on Saturday face inspections early on race-day morning.
Kempton officials have called a 7.30am inspection, with the all-weather circuit at the Sunbury venue covered in snow.
Clerk of the course Barney Clifford, who is currently in France, said: "They've had three inches of snow, it's still snowing and there is more snow forecast. The course is not raceable now and we'll just have to see what they can achieve."
He added: "It is not just about the track, there is the infrastructure and everything else to consider. They will inspect at 7.30am and they'll know what can be achieved by then."
Lingfield will inspect at 7am after losing Friday's card due to snow, clerk of the course Neil Mackenzie Ross finally admitting defeat after staging inspections at 8am, 10am and 11am. He called off the meeting before a planned noon check.
He said: "We are just struggling with the machinery on the track. We can't get it round quickly enough to keep the track fit for racing. While it is not particularly heavy snow, it is coming down continuously, which means we aren't able to keep the track safe and fit.
"We need to go and take stock of the situation, keep working the track for the rest of the day and overnight if needs be."
Friday's meetings at Wolverhampton and Chepstow were also abandoned on raceday due to snow, along with Saturday's at Haydock and Taunton.
Clerk of the course Kirkland Tellwright was due to inspect the Haydock track at 8.30am on Friday, but with an inch of snow already on the ground and more forecast, he made an early call.
Taunton clerk of course Michael Trickey said: "We have had about three inches of snow and it is still snowing. I couldn't actually get to the track as I live 40 miles away, but we've had to abandon."
1 November 2014Melbourne draw pleases Murtagh
Richards raring to go with Eduard
Meade trio on Cork National trail
Farraaj 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