2013 Grand National to modifications made for the previous year's race, Aintree announced that a number of further changes had been made for the 2013 National. Twelve of the 16 fences on the course were rebuilt with the timber frames within them replaced by a softer material known as "plastic birch". The fences are still covered with at least 14 inches of spruce and will remain the same height. The starting line was also moved 90 yards closer to the first fence, further away from the spectators' stands and thereby reducing slightly the overall distance. Aintree and the Professional Jockeys' Association jointly issued
Aintree Racecourse fear into the most professional of jockeys. All fences bar the water jump are covered with spruce, unlike at any other course in British National Hunt racing. Four other races take place over the National fences. These are the Topham Chase (formerly known as the John Hughes Trophy Chase) and the Fox Hunters' Chase at the Grand National meeting, and the Grand Sefton Handicap Chase and Becher Chase in the December meeting. Within the large National course there is also the smaller Mildmay course containing hurdles and fences. These fences are made of traditional National Hunt material. The National and