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.
22 September 2014Classic hopes for Halford pair
Marnane pair take a break
Eagle the highlight for Smullen
X-Factor makes it Peckham first
Cooper edging closer to return
River 'possible' for Royal Lodge
Nash eyeing Aintree bid for Busy
Ajjaadd team seek autumn aim
Fitz fine following comeback run
Dark team to mull options
Glory in Abbaye frame
Ascot on Silk radar
21 September 2014Brooch adorns Smullen century
Together takes Gowran spoils
Chrome beaten in Parx return
Fab Fitz back in business
Ayr raid heaven sent for Doyle
Improving Angel lifts Trophy
Hunter hits the target at Ayr
Pilot flies to Newbury glory
Close gets Silver call
Toocool too good in Mill Reef
Dark lights up in Clyde
Hill stars at Newbury
20 September 2014King Louis strikes Ayr gold
Yeenaan takes control
Wannabe Yours heads Joel list
Providence supplemented for Rockfel
That could tackle fences this year
Bell saddened by Wigmore article
Limato out of Mill Reef
Horse welfare 'priority' - BHA
Four-timer for magical McCoy
Accipiter comes good for Wall
Hawk leads treble swoop for Hughes
Bamford wants a Gold Watch
Ainippe samples joy of six at Ayr
Goldie pair on Gold run
Angel of the north heads to Newbury
Candy issues Limato Reef advisory
Glorious bids to protect Legacy
19 September 2014Perfect return for Maguire
Rebel has a cause at Listowel
Ryan quartet in Ayr raid
Varian swoops for Marshall
Simcock aims high with star duo
Bolster back on Gold trail
Fahey chasing Newmarket Millions
Time called on Dude career
Makin off to a flyer at Ayr
Festival stalwart Celestial retired
Guest banking on Memory at Ayr
Dettori sweet on World rule
Baraweez on track for Ascot
Maguire raring to go
Watchable handed low Gold draw
Palmer mulls Aktabantay options
Bronze seeking Newmarket gold