Thursday’s meeting at Ffos Las has been called off due to a frozen track.
Officials had hoped to escape the worst of the overnight freeze and called a precautionary inspection for 8.30am on Wednesday.
However, that check showed the track to be unraceable with little prospect of sufficient improvement.
The course tweeted: “Despite the huge efforts of our ground staff team to cover the course, tomorrow’s race meeting has been abandoned – parts of the track are frozen and temperatures are not forecast to rise sufficiently for it to thaw.”
Newcastle and Wolverhampton will both have to pass 10am inspections if today’s meetings are to go ahead.
Newcastle is due to stage a seven-race card kicking off at 1.30pm, but overnight snow combined with temperatures of -5C overnight forced clerk of the course James Armstrong to take an initial look at 8am.
With further snow flurries a possibility, Armstrong then opted to check again at 10am.
He tweeted: “Temps currently -1.5c. Light snow flurries on & off. Course worked from early hrs at least three times. Need temps to rise to assist in melting snow mixed within the Tapeta profile. Will work again soon as temps lift further.”
Wolverhampton’s eight-race fixture starts at 4.45pm and it too is subject to a 10am inspection.
The track had a light covering of snow overnight, but officials remain optimistic of the card going ahead as planned.
Thursday’s Thurles card is also under threat, with a precautionary check planned for 7.30am on race day.
An Irish Horseracing Regulatory Board statement said: “Due to a Status Yellow weather warning in place for snow and ice, there will be a 7.30am precautionary inspection at Thurles tomorrow (Thursday) ahead of the fixture scheduled to take place.
“The track is currently fit for racing and the going is soft (chase) and soft to heavy (hurdle/bumper).”