Electric Picnic has been pushed back by three weeks in an effort to ensure the festival will be able to go ahead.
In a statement released on Tuesday, organisers said that due to the great progress being made on the vaccine rollout, with the target of having at least 70% of the country fully vaccinated by the end of July, they are "confident that the festival can take place this year".
However, they have made the decision to move the dates back by three weeks to September 24-26 instead of the original dates of September 3-5 to ensure "a much better chance" of the festival going ahead.
The statement said: "We are as desperate as everyone else to get our industry back up and running, and if moving the festival further back in September helps that dream become a reality then we feel it's the right decision to make.
"We also understand that this may not suit everyone, and if you cannot make it that weekend then you are entitled to a full refund."
The statement concluded: "Everyone in our industry, and the entire country for that matter, needs some sort of hope that the end of this pandemic is in sight. We truly wish that Electric Picnic will be the light at the end of the tunnel and we can welcome you all to Stradbally this year.
"Thank you so much for your continued patience and we will keep you updated as much as we can."