Apex Park occupies land that originally formed part of the coastal dunes at the northern end of Mona Vale beach. The dunes were formed from wind-blown marine sands resulting in a gently undulating landscape. The original vegetation of the area, little of which survives today, would have consisted of spinifex grassland in the very exposed positions and low scrub dominated by Acacia, Banksia and Tea Tree in the more protected positions.

The natural landscape of the area was changed dramatically following the settlement of the Pittwater area by Europeans in the early nineteenth century. The land formed part of a seven hundred acre grant to Robert Campbell by the mid-nineteenth century.

By 1911 the Campbell Estate was subdivided  into small residential lots known as Brock's Surf Beach Estate. The present Apex Park was made up of eighteen of these allotments.These were acquired by Council over a period from 1955 to 1979 for the specific purposed of creating additional open space for Mona Vale Beach.

Following the acquisition by Council of the remaining buildings on the site, the Council permitted the mining of the dune for building sand. The depression was used as a tip for some years during the 1970's until its present levels were established by the overlaying of a clay cap and mineral fill. The park was subsequently grassed and a barbecue and picnic area installed by the local Apex branch. The park then became known as Apex Park.

During the late 1980s, Warringah Council undertook a masterplan and landscape improvements program that resulted in the development of the northern end of the park to its present form. The playground, children bike track, picnic pergolas, BBQs, stone walling, shrub planting and Norfolk Island Pine plantings were installed as part of these works.