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Doors Open Ontario presenting sponsor
Doors Open Ontario presenting sponsor

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Doors Open Ontario:

Rideau Lakes

in-person event information

Saturday and Sunday, August 16 and 17, 2025, from 10 a.m. to 4 p.m.

Doors Open Rideau Lakes is back!

You’re invited to walk through more than 20 special sites and learn by exploring the rich heritage, nature and culture here. From grand historical houses to nationally significant natural spaces to marvels of construction, Doors Open Rideau Lakes has something for everyone.

Join us this August to be inspired and intrigued!

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Community information

The natural setting of Rideau Lakes Township is highlighted by the rugged Frontenac Axis, a branch of the Canadian Shield — with its rocks and granite baked and blended a billion years ago in the roots of the Grenville Mountains.

Now worn away to their very roots by time, rain, wind, rivers and glaciers, there are only echoes of those mountains left at Foley Mountain. Paleozoic seas washed over this rugged land half a billion years ago and left the beautiful layers of sandstone used in the building of Ontario's only UNESCO World Heritage Site, the Rideau Canal. Our many lakes were gouged out of soft Precambrian marble and filled by the most recent melting of an ice sheet 10,000 years ago.

The Rideau waterway offers excellent canoeing, sailing, boating and fishing. Passage through the locks is an experience unto itself. This vacation paradise has many scenic villages and hamlets, surrounded by agricultural pursuits and recreational opportunities like swimming, hiking, golf, bicycling or antiquing.

Come and see for yourself what everyone’s talking about!

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Become a volunteer

To become a volunteer for Doors Open Rideau Lakes, contact Rosanne Lake, Heritage Program Event Assistant, at doorsopen@rideaulakes.ca.

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Contact information

Email: doorsopen@rideaulakes.ca
Website: https://www.rideaulakes.ca/experience/things-to-do-continued/museums-heritage-sites/doors-open

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1 In-person Doors Open site

Old Stone MillDoors Open Rideau Lakes

New

  • In-person Doors Open Ontario

Old Stone Mill

The Old Stone Mill is Ontario’s only surviving pre-1812, fully automated stone gristmill. Built of local stone and timber after inventor OIiver Evans’ design, it has been revitalized by the Delta Mill Society with authentic equipment and enhanced interpretation. Watch the 200-year-old millstones in action. During Doors Open, there will be blacksmithing demonstrations on Saturday and a special quilt display.

  • Guided tours available
  • Kid-friendly
  • National Historic Site (Canada)
  • Partial wheelchair access
  • Self-guided tours available
  • Photography allowed

Contact info

44 King Street
Delta, Ontario
https://deltamill.org

Architecture

Year built: 1810
Building type: Historical landmark Museum

Dates/hours open

Aug 16 - Aug 17
Old Stone Mill