Situated in the West Humber River Valley, the Humber Arboretum offers a balance of managed and natural areas, featuring a wide variety of plants and wildlife. It is a pleasant educational experience for visitors of all ages. Several kilometres of self-guided trails connect the various areas of the Arboretum, providing a wonderful way to experience nature. The grounds are open every day of the year. Humber Arboretum is managed by the Humber College of Applied Arts and Technology, The Toronto and Region Conservation Authority, and the City of Toronto. The Arboretum began operation in the fall of 1982.

The Nature Orientation Centre, designed as a focal point for the Arboretum, is an educational facility which contains an assortment of ever-changing displays and exhibits. Visitors can also see much of the site from the Centre's circular wooden deck. The Dunington Grubb Gardens, below the Centre, are the most intensively cultivated section at the Arboretum. Howard B. Dunington Grubb founded Sheridan Nurseries in 1913. He and his wife gained recognition for their significant contribution to horticulture in Canada. Financial support for the Gardens was initially provided by their foundation. The Woodlot and Meadow Garden is a 10-hectare fringe Carolinian hardwood forest (containing ash, maple, beech, and ironwood trees) surrounding a naturalized meadow where over 5,000 plants, typical of species found in this environment, have been introduced. A trail connecting the Dunington Grubb Gardens to the Demonstration Gardens further east supports an extensive collection of native woody plants. Plant lists developed with the Ontario Forestry Association emphasize those species which are most suitable for the urban environment. The Demonstration Gardens, opened in 1986, offers the "do-it-yourself" gardener many new landscape design ideas, from innovative building materials to construction techniques; it has become a scenic backdrop for unique plantings intended to show visitors how limitless landscaping can be.

Nature Orientation Centre
Dunington Grubb Gardens
Garfield Weston Valley Gardens
Woodlot and Meadow Garden
Demonstration Gardens
Native woody plants including White Dog's-tooth Violet and Yellow Trout Lily (E.S.A.#11)
Guided tours
Young Friends of the Arboretum: children's nature club
Patrons of the Humber Arboretum:
supporters include individuals, families, groups, and businesses commemorative tree planting