 It was announced on 10 August 2009 that Allenby would be signing for Glamorgan County Cricket Club for the 2010 season.On 4 June 2010, Allenby scored 58 runs for the Dragons in their Friends Provident opening match against Gloucestershire.At the end of the 2012 season which saw him score 733 County Championship runs and take 42 wickets, he was named Glamorgan's player of the year.