During the 2005–06 season, Hilfenhaus remained on a rookie contract but excelled by taking 39 wickets in the Pura Cup at an average of 30.82. His performance broke the previous record held by West Indian great Michael Holding for most wickets in a first-class season by a Tasmania debutant. As a result, he was awarded a full-time contract with Tasmania for the 2006–07 season.

That same season, Tasmania won their first-ever Pura Cup, with Hilfenhaus playing a pivotal role. He was named Tasmania's Player of the Year and later acknowledged nationally as the Bradman Young Cricketer of the Year in 2007. His best first-class bowling figures are 7/58.

In 2007, Hilfenhaus made his debuts in both Twenty20 International and One Day International formats for Australia. However, an injury delayed his Test debut, which eventually came in 2009. Despite the setback, his selection marked his arrival on the international stage.

Australia A, International Representation, and Bowling Style

Hilfenhaus also represented Australia at the under-19 level and played in the Australia A squad and the Australia XI in the Top End Series during the winter. Known for his consistent line and length, he primarily employed swing and seam bowling techniques to trouble top-order batsmen. His approach emphasized control and subtle movement rather than sheer pace.

Personal Life and Other Interests

Outside of cricket, Hilfenhaus is an avid golfer with a handicap of eight. He gained further public attention when he appeared as "Mr September" in the McGrath Foundation’s 2009 Men of Cricket charity calendar, aimed at supporting breast cancer awareness.

In 2012, he married Meri Jenkins. That same year, he missed the Indian Premier League (IPL) season due to injury. While details about his net worth remain private, his contributions to Australian cricket and domestic leagues have solidified his reputation as a respected fast bowler.