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."
28 February 2015Irish pair do battle in France
Geraghty: Sprinter will be fitter
Wylie lines up Cheltenham team
Twiston-Davies Blak in business
Divine Bishop on Festival trail
Irish duo set Doncaster poser
Night riding high for Grimthorpe
Glingerburn facing another battle
Pipe targets Aintree with veterans
Carlito primed for Kelso return
McCoy not planning Festival goodbye
Bridge camp praying for rain
Cook suspended from riding
27 February 2015Golantilla in Ballsbridge bid
Safety strikes in Zabeel Mile
Fehily confirms Zarkandar mount
Lieutenant bosses Purcell rivals
Dettori delights on Dubday
Many Clouds goes back to school
Maguire loses appeal
New One at ease for Faugheen clash
Foxrock still in Gold Cup picture
Apache ready to take flight in JLT
26 February 2015Higgins back in business
Cookie poised for April return
Silvi threat unsettles Riches camp
No going concerns at Cheltenham
Fry resigned to Fehily Ruby loss
Trip key to Balder success - King
McLernon gets nod for Holywell
Salsify leads Foxhunter field
Mullins unveils Bumper entry
Curtis hoping for Cross revival
Aurore misses Mares' date
25 February 2015Ton-up for in-form Pipe
Big display from George veteran
Credit to join the Premier league
Jack to duck Grimthorpe date
Tea preparing for National tilt
Geraghty rates Whisper World claims
George retains Module faith
Uramazin ready to go again
Coney team wait on Festival call
Aintree on Ceremony agenda
Silvi is all Gold - Nicholls
Bright Clouds gets serious
Puffin swoops at Leicester
Nicholls: Rheu call tough for Sam
Nicholls suffers Hinterland blow
Own on Cheltenham trail
BHA issues new anti-doping rules
Walsh hoping for a Champagne moment
That ruled out of World bid