The Arboretum Field, located to the south of the Planetarium, is a large grassland area with a hardcore path around the perimeter which forms the Arboretum Trail. Around the trail can be found pieces of exercise equipment and the field itself is occasionally used as an overflow car parking area during busy periods and events.

The field starts at a high level near the play area and gently falls away to the south, where it forms a hollow that is a natural amphitheatre. A small pond can be found close to the southern extremity of the path which sometimes dries up in the summer.

The Arboretum Trail itself is a collection of native British Trees which are planted in the order that they colonized the British Isles after the last ice age, about 10,000 years ago. “Native” is defined as a tree that colonized without the aid of people, hence they were not introduced and invaded the countryside before the land-bridge between Britain and Europe disappeared after the last ice age. A few commercially important conifer specimens have been included at the end of the trail as they are very common throughout the country.

The Arboretum was planted by the Teesside branch of the Parachute Regimental Association to commemorate those in their regiment who have died. Today it is managed by the Country Park’s Ranger Service.