Hereford officials have called a precautionary inspection at 8am ahead of Wednesday's jumps meeting.
Frozen places on the back straight appear to be the issue, though the forecast is for temperatures to remain just above freezing overnight with clear skies. Frost covers remain in place as a precaution.
It should get up to 5C by lunchtime on Wednesday, with some cloud cover interspersed with sunny spells.
The going is described as good to soft.