The parish was founded in 1728, pre-dating the incorporation of both Windsor and Detroit as modern cities.
It originally served the Huron-Wyandot mission, acting as a spiritual center for indigenous communities long before the arrival of widespread European settlement.
The current church building was constructed using limestone quarried from the nearby Amherstburg area.
It is the oldest continuously operating parish in Canada west of Montreal.
The site was designated a National Historic Site of Canada in 1977 due to its architectural and cultural significance.
The church spire has undergone extensive structural restoration over the last decade to preserve its 19th-century design.
The parish records house some of the earliest baptismal and marriage registers for the Detroit River region, dating back to the 18th century.
Our Lady of the Assumption Church is the oldest Catholic parish in Ontario, established by Jesuit missionaries for the Huron-Wyandot people in 1728. The current building, a notable example of High Victorian Gothic architecture, was constructed between 1842 and 1845. It sits directly across the Detroit River from downtown Detroit, serving as a historical link to the early French settlement of the region. The interior features intricate woodwork, high ceilings, and traditional religious iconography maintained through various restoration efforts. The parish maintains deep historical ties to the development of the border region between Canada and the United States. Its location in Windsor makes it a key site for understanding the colonial history of the Great Lakes.
From the riverfront path in Assumption Park looking back toward the church spire with the Detroit skyline in the background.
Walk through the surrounding Assumption Park for a clear view of the Detroit skyline.
Check the parish bulletin online before visiting to avoid arriving during private events or funerals.
Look for the commemorative plaques on the grounds detailing the church's connection to early Jesuit missionary work.
Attempting to enter the church during active mass if you are not attending the service, and mistaking the parish office building for the main chapel.
The church building is sometimes restricted to liturgical use only; consult the parish website for updates on ongoing restoration or community access closures.
Maintain a quiet, respectful tone; avoid photography during active liturgical services; modest dress is expected.
