St. Marys, Ontario: History, Things to Do and Travel Guide
St. Marys sits where Trout Creek meets the Thames River in southwestern Ontario, within the Huron, Perth, Waterloo and Wellington travel region. Limestone ledges, river mills, railway bridges and stone buildings give the town its Stonetown identity.
The best first visit connects the downtown heritage district, the river walkway, the Grand Trunk Trail, the Quarry and local museums. St. Marys is compact, but the landscape explains much of the town’s character.
How St. Marys Started
The Town of St. Marys acknowledges that the community is located on the traditional territory of the Haudenosaunee, Anishinaabe and Ojibway/Chippewa people, within Treaty 29, the Huron Tract Purchase, and the Dish With One Spoon wampum agreement.
European settlers arrived in the early 1840s, drawn by natural resources at the meeting of Trout Creek and the Thames River. The water dropped over limestone ledges, creating power for the first mills. Limestone was also accessible along the riverbanks, and it became the material that shaped many of the town’s most recognizable buildings.
The arrival of the Grand Trunk Railway in the late 1850s accelerated growth. St. Marys became a centre for milling, grain trading and agricultural manufacturing. The railway also left major landmarks: trestle bridges that still shape views over the river and the town.
By the late 1800s, St. Marys had churches, commercial blocks, homes, an opera house, Town Hall and a Carnegie Library. The limestone architecture from that period is the reason the town’s Stonetown nickname still works today.
What St. Marys Is Like Today
St. Marys is a small town with a strong built identity. The downtown Heritage Conservation District, limestone buildings, river walks and old rail corridors make it easy to understand the town on foot.
The Thames River and Trout Creek are still central. Trails follow the waterways, paddling is possible in suitable conditions, and the former industrial river edges now serve walking, biking, fishing and sightseeing. The Riverview Walkway passes remnants of milling and quarrying industries, turning the landscape into a local history route.
The town also has a practical cultural side. The St. Marys Museum and Archives, the Canadian Baseball Hall of Fame, downtown shops, restaurants and seasonal events give travellers several reasons to linger beyond the main viewpoints.
The Quarry is the best-known summer recreation site. It began as a limestone quarry, later closed, and was converted into a public swimming area in the mid-20th century. Today it gives the town a warm-weather attraction directly tied to the limestone story.
Things to Do and Places Nearby
Start downtown. Walk Queen Street, look at the limestone commercial blocks, then move toward the river. The Town of St. Marys heritage material points visitors to the architecture because the buildings show how the community developed.
Follow the Riverview Walkway to connect downtown with the Quarry area. For a longer outing, use the Loop Trail, which passes historic sites and natural areas including the Canadian Baseball Hall of Fame and the Quarry. The Grand Trunk Trail adds elevated views from the former railway bridge.
The Quarry is the main summer draw. The swimming quarry offers outdoor swimming and related warm-weather activities, while the separate west quarry is used for fishing. Always check current rules, hours and registration details before planning around it.
The Canadian Baseball Hall of Fame adds a different kind of stop. It fits well with the Loop Trail and gives the town a national sports-history angle alongside the local limestone and river story.
For context beyond town, Stratford is a nearby theatre and food destination, while London is the larger regional city to the southwest. St. Marys works best when those trips are added after a local river-and-limestone visit, not in place of it.
Waterway visitors can also look at the Thames River and Trout Creek paddling routes promoted by Discover St. Marys. Conditions matter, so this is best treated as a planned activity rather than an assumed add-on.
Quick Facts
- Community: St. Marys
- Province: Ontario
- Region: Huron, Perth, Waterloo and Wellington
- Municipality type: Town
- 2021 census population: about 7,300
- Official website: townofstmarys.com
- Main travel areas: downtown Heritage Conservation District, Thames River, Trout Creek, Riverview Walkway, Grand Trunk Trail, St. Marys Quarry, St. Marys Museum and Archives
- Key routes: Highway 7, Perth County roads, routes between Stratford and London
Travel Notes
St. Marys is easy to explore on foot once you are downtown. Bring comfortable shoes if you plan to combine the heritage district, river walk and Grand Trunk Trail.
Summer is best for the Quarry, paddling, patios and longer trail days. Spring and fall are excellent for architecture, river views and lower-pressure walking. Winter visits are quieter and more focused on museums, downtown food, indoor cultural stops and photography around the stone bridges and river.
Check Quarry hours, admission rules and swimming conditions before travelling. For trails and paddling, watch water levels and weather, especially after heavy rain.