As addition to the coniferous forest fine parts of the original beech forest have preserved. The largest stands of old nature forest with beech trees can be found in the areas; The hills Rebild Bakker, Bjergeskov, Troldeskoven, and Urskoven. Especially in Rebild Bakker the trees are multi-stemmed, twisted and gnarled.
Troldeskoven and Urskoven have been left untouched since 1992, meaning that the forest actually sustains itself. Consequently, it is not allowed to cut down trees or make any cultural intervention in these areas. Other natural forests such as Rebild Bakker are maintained as with forest grazing, where sheep and cattle run around free.
The former forester, Jens Hvass, desired to preserve the beautiful forest and at the same time to develop it. At his request, since 1970 it has been possible to visit the beautiful arboretum called Den Jyske Skovhave.