St. Marys Quarry: Canada’s Largest Outdoor Freshwater Swimming Pool

This summer jump off a cliff into Canada’s Largest Outdoor Freshwater Swimming Pool!

Located in Southwestern Ontario, at the junction of Thames River and Trout Creek, is the little town of St Marys.

Founded in 1840’s when settlers came in search of the town’s abundant of limestone, St Marys is home to Canada’s largest outdoor freshwater swimming pool that started out as limestone quarry.

The Town of St Marys bought two abandoned limestone quarries along with 50 acres of surrounding land in 1945 and in the course of time converted it to a public recreational facility.


Today, you can cliff jump into the quarry (water level permitting), swim, jump into 25-foot water trampoline, explore the quarry on Stand-up paddleboard, or play beach volleyball!

Go, take that detour to St Marys when you are travelling between London and Kitchener or en-route to Grand Bend Beach/ Lambton Shores from Toronto.


Saturday, June 19 and Sunday, June 20: 1:00–2:45 pm, 3:15–5:00 pm
Saturday, June 26 and Sunday, June 27: 1:00–2:45 pm, 3:15–5:00 pm
Monday, June 28 to Monday, September 6: 1:00–2:45 pm, 3:15–5:00 pm, 5:30–7:30 pm

Where: St. Marys Quarry, 425 Water Street South, St. Marys

How much:$4.50 for a child/youth (ages 3 – 17)
$7.00 for an adult (ages 18+). Online Registration Required.

Swim Level to jump off the cliff: Ability to tread water for 3 minutes and swim 100 meters continuously.


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A post shared by Meagan Needles (@meaganneedles)

What else to do at St Marys

Also know as the The Stone Town because of its limestones, St Marys is home to Canadian Baseball Hall of Fame and a splendid 3.2 km accessible walkway that started out as part of the historic Grand Trunk Railway.

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