Friday afternoon's meeting at Doncaster must pass a third course inspection at 11am.
Although the track was raceable at 8am and an hour later, more snow has been forecast ahead of the first Flat fixture on turf this year.
Doncaster's big meeting on Saturday, featuring the William Hill Lincoln, must also pass an inspection at 12pm this afternoon.
Clerk of the course Roderick Duncan has moved forward his intended check from 8am Saturday morning.
