Photo credit: Mike Burrell



Endangered means the species lives in the wild in Ontario but is facing imminent extinction or extirpation.

Date added to the Species at Risk in Ontario List

January 26, 2022

Read the assessment report (PDF)

What it looks like

Black Ash is a medium-sized, shade-intolerant hardwood tree species that occurs on moist to wet sites such as swamps, bogs and riparian areas.

It is a broad-leaved hardwood tree in the Olive family, growing 15 to 20 m in height, but can grow to as high as 27 m, and 30 to 50 cm in diameter. The leaves are roughly 15-30 cm in size.

Where it lives

Black Ash is predominantly a wetland species found in swamps, floodplains and fens.

Black Ash occurs from western Newfoundland to southeastern Manitoba and North Dakota, ranging southward to Iowa, Illinois, Virginia and Delaware. Black Ash’s range extends farther north than any other ash and approximately 51% of the species’ global range is within Canada.

Where it’s been found in Ontario

Black Ash occurs throughout most of Ontario, except the Far North, ranging from southern Ontario east to the Quebec border, west to the Manitoba border and north to approximately 51° latitude.

Approximately 25% of the global range of Black Ash occurs in Ontario.

What threatens it

Black Ash is highly susceptible to the invasive Emerald Ash Borer (EAB). It is expected that EAB will cause declines in the total number of Black Ash trees by greater than 70% over the next two generations (100 years).

EAB was introduced to the Detroit-Windsor area in the 1990s and has since become established in almost all counties in southern Ontario. It has also been detected in Sault Ste. Marie, the Algoma District, Manitoulin Island and Thunder Bay.

Action we are taking

The Ministry of the Environment, Conservation and Parks temporarily suspended protections for Black Ash for a period of two years from the time the species was added to the Species at Risk in Ontario List (Ontario Regulation 230/08) in January 2022 to determine the best way to balance protections for Black Ash while managing invasive Emerald Ash Borer (EAB) and the social and economic realities of Ontarians.

On January 25, 2024, the ministry made new regulations that focus the application of the Endangered Species Act protections on areas of the province where Black Ash has experienced significant mortality due to the invasive Emerald Ash Borer, the primary threat to the tree species. See the actions we are taking below.

The Ontario government supports federal Canadian Food Inspection Agency efforts related to EAB.

Recovery strategy

A recovery strategy advises the ministry on ways to ensure healthy numbers of the species return to Ontario.

Read the executive summary and the full document (September 6, 2022).

Government response statement

A government response statement outlines the actions the government intends to take or support to help recover the species.

Read the government response statement (January 25, 2024).

Species protection

A species regulation sets out how ESA species protections apply to a species and may describe geographic boundaries, times the protection would apply, or other specified circumstances.

Read the regulation (January 24, 2024).  

Habitat protection

A habitat regulation defines a species’ habitat and may describe features (for example, a creek, cliff, or beach), geographic boundaries or other unique characteristics.

Read the regulation (January 24, 2024)

What you can do

Report a sighting

Submit your observations of species at risk to the Natural Heritage Information Centre (NHIC), which is Ontario’s conservation data centre. Join the (NHIC) Rare Species of Ontario project in iNaturalist to make submitting your observations quick and easy.


Volunteer with species at risk programs, such as community science surveys, through your local nature club, a provincial park or other conservation organizations.

Be a good steward

Report illegal activity

Report any illegal activity related to species at risk to 1-866-MOE-TIPS (663-8477).

Quick facts

  • Like other ash (Fraxinus) species, Black Ash has wind-dispersed pollen and seeds and regenerates readily from seed and via stump sprouting.
  • Black Ash is of cultural significance to Indigenous peoples.
  • Black Ash trees are currently used for a variety of purposes including lumber, fuelwood, and Indigenous traditional uses (such as producing woven baskets).