A defining feature of the school is its agricultural program run out of the Barclay farm. Muirfield has run an agricultural display at the Castle Hill Show since 1892. In 1912 the school won the award for "Best School Display". Issues arising from drought resulted in the School withdrawing from the show in 2007. In 2010 Muirfield High School was invited to participate in the first Sydney Royal Easter Show Schools Fruit and Vegetable Display, where the school was awarded 2nd place. Muirfield High School was invited back to compete, representing the Western District, in 2011 and 2012 with the school being awarded 1st place both years for their innovative designs that both engaged and reflected the current agricultural climate.