After struggling to get a game for Queensland due to the long fast-bowling queue, Edmondson was invited to Western Australia. He made his Pura Cup debut for the Warriors after just 5 days from his arrival. He finished the season with 28 wickets at 31.61. He was one of the heroes against his former state in a thrilling ING Cup final victory.
The next summer he was the state's leading wicket taker with 29 victims in seven games. He was rewarded with selection in the Prime Minister's XI. In 2005-06 he demonstrated great consistency by again topping 20 wickets with 24 at 33.79. Edmondson has career best figures of 6/28.
In 2003 he represented Denmark in a one-day game against Scotland.