The landscape dates back to the middle ages when it was a deer park owned by the Bishop of Winchester who resided in Farnham Castle. The park was used as a hunting ground for royalty. In the 18th century poaching for deer was rife in the park. In 1721 a keeper was wounded whilst trying to stop poachers from taking deer. Farnham Park was sold to the town of Farnham in 1930.

Much of the park is on thick clay making walking very sticky underfoot in winter. The clay was used for making pottery in the medieval period. The Avenue of Trees runs from the castle along the chalk ridge of the North Downs for a distance of over 1km. The original avenue of elms was over 300 years old but was devasted by Dutch Elm Disease. The present avenue, made up of lime and beech trees, was planted in the 1960s.  Superb views over Farnham can be seen from this  north boundary of the park.

The Cannon or Carron Pond  provides an important habitat for breeding water fowl. Friends Pond and was constructed by the Friends of Farnham Park in 1995.  Yo-Yo pond  is named because of the rise and fall of its water level. It is a typical woodland pond. The stream running through the Park is the Nadder Stream (winding one). There are several places where the stream disappears underground when it crosses from clay to the more porous chalk.

The Grassland in the Park supports a rich variety of different species.  Management of the grassland is required to prevent scrub and woodland from taking over. The management is by a mixture of grazing and hay-cutting.