Racing at Ffos Las was abandoned less than 15 minutes before the scheduled start of the card due to frost in the ground.
Four inspections were held at the West Wales track, after temperatures dipped to -2C overnight.
Jockeys Sam Twiston-Davies, Will Kennedy and Rex Dingle joined trainers Anthony Honeyball, Sarah-Jayne Davies, Peter Bowen and David Rees to assess conditions.
BHA and course officials were interviewed and the stewards ordered the seven-race card to be abandoned at 12.45pm.
The decision was made, 13 minutes before the first race at 12.58pm, due to frost in the bypass areas.
Clerk of the course Dai Jones said: “We gave it every chance.
“The weather was supposed to get up to about 4C and unfortunately it never was above 1C.
“The sun came out for about an hour and then went back in.
“We had a delegation of jockeys and trainers come out and look at the track, the racing line was OK but there was still a bit of frost in the ground in the bypass areas.
“Safety is paramount so we had to abandon.”
Trainer Jamie Snowden was due to run Sandaroc in the opening contest, the Vibe Recruit Partners With Ffos Las Mares’ Novices’ Hurdle.
“It’s frustrating to call it off before the first race,” he said.
“Trainers and jockeys felt happy with the ground.
“Horse welfare is always the forefront of our minds and in every decision we take.”
Johnny Farrelly, who had sent recent winner Sandford Castle on the six-hour round trip for the K. P. Tyres Llanelli Handicap Chase, said: “Dai is a very good clerk of the course and he has given it every chance to be on.”
The late call attracted some criticism on social media and Ffos Las became a trending topic on Twitter.
One user felt it was “very unsatisfactory,” while another said: “If you are going to wait that long, why not call off the first race and give the others a chance?”
Jones added: “I understand people may be frustrated.
“If we didn’t think there was a chance of it being on we wouldn’t have risked it.
“I understand travelling down to West Wales is not easy.
“In any situation I always have in my mind how far people have to travel.”