The course is currently raceable and it passed its first inspection on Saturday afternoon with the ground described as heavy and, while frost sheets have been deployed, the seven-race card must pass a morning check with an inch of sleet and snow forecast throughout Sunday.
Clerk of the course Libby O'Flaherty said: "On Saturday the track was totally raceable and we've covered all of it. The forecast is for a frost overnight but the challenge will be the snow that's forecast in the morning, due to come in between 8am and 9am.
"We'll see what we arrive to in the morning, but it's forecast for sleet and snow all day and we could get up to an inch by the end of the day. It's very challenging and it'll be up to what the weather does in the morning.
"We've done all we can and our fingers are firmly crossed."
Market Rasen's seven-race card on Monday is subject to a midday inspection on Sunday, with conditions currently soft, heavy in places with areas of ground frozen and sub-zero temperatures expected on Saturday night.
There is also a threat of snow showers at the Lincolnshire track throughout Sunday, with temperatures forecast to plummet as low as -4C on Sunday night.
No further inspections have been called as of yet for next week's meetings but Wetherby, who are due to stage racing on Thursday, remains flooded in places after the nearby river burst its banks last week.
However, the river levels have dropped and the standing water on the track had reduced by 30 per cent on Saturday.