The Flat meeting at Tipperary on Thursday has been cancelled.
Following heavy rain today, and with more forecast overnight, officials made the decision with the track partially waterlogged.
Racecourse manager Jane Davis said: "We had a lot of rain today, so parts of the course are waterlogged and we've got a very bad forecast for tonight.
"We are working with Horse Racing Ireland about some options for rescheduling. We will have a press release tomorrow morning regarding that."