For spring 2009 they focused on touring Canada, while also playing some concerts in the northeastern US.
Celtic Thunder's first studio album and first concert special DVD were released on March 18, 2008.
In 2011, Damian Mc Ginty (the group's youngest member) entered and won the Oxygen reality show The Glee Project.
On August 21, 2011, Mc Ginty announced on The Glee Project During their 2012 tour, Colm Keegan was asked to stand in for Ryan Kelly, who was hurt in a fall.
On April 3, 2014, Emmet Cahill announced that he would once again be joining the "Thunderheads" on the Australia tour to pay homage to Donaldson.
On April 5, 2014, it was unofficially announced that Emmett O'Hanlon would be filling the place of Emmet Cahill after his departure.
In March 2009, Celtic Thunder opened the Saint Patrick's Day Parade in New York City.
On November 28, 2010, Celtic Thunder member Paul Byrom announced his resignation from the group to begin a solo career.
He was preparing for the Celtic Thunder Australian tour in May.
Celtic Thunder made their ‘Mythology’ tour as a homage to him.
On December 16, 2015, Colm Keegan announced that he will be taking a break from touring with Celtic Thunder for a year and will be recording a new solo album.
Emmet Cahill rejoined Celtic Thunder to replace Keegan.
His last appearance with Celtic Thunder will be on the Celtic Thunder Cruise II in November 2014.