Celje boasts a large and neatly trimmed city forest that invites visitors, hikers, and athletes throughout the year.

It extends along the southern border of the town, from the foothills to the slopes of Anski vrh and Miklavški hrib. Spanning 94 hectares of forest areas and including 14 kilometres of maintained walking trails, it is the largest maintained public green area in Celje. The city forest is home to the biggest tree house in Slovenia.