Events:
- Gardening for Tots with Bob, Ken Seiling Waterloo Region Museum, Kitchener, May 11
- Mother's Day Painted Flowerpot, Elman W. Campbell Museum, Newmarket, May 11
- Adult Workshop - Preparing to Garden, Ken Seiling Waterloo Region Museum, Kitchener, May 11
- 20th Annual Heritage Plant Sale, Ken Seiling Waterloo Region Museum, Kitchener, May 18
- Queen Victoria's Birthday and Garden Party, Fanshawe Pioneer Village, London, May 20
- Annual Plant and Garden Sale, Fanshawe Pioneer Village, London, May 20-21
- Urban Garden Club for Little Sprouts, Schneider Haus National Historic Site, Kitchener, May 25
- Urban Garden Club, Schneider Haus National Historic Site, Kitchener, May 25
Sites with outdoor natural spaces:
Southwest Ontario
- Ska-Nah-Doht Village and Museum, Mount Brydges
- John R. Park Homestead Conservation Area, Harrow
- Ruthven Park National Historic Site, Cayuga
- Backhouse Historic Site, Port Rowan
Niagara Falls and Wine Country
- Niagara Parks Commission, Niagara Falls
- St. Catharines Museum and Welland Canals Centre, St. Catharines
Hamilton, Halton, and Brant
- Bell Homestead National Historic Site, Brantford
- Griffin House, Ancaster
- Whitehern Historic House & Garden, Hamilton
- Ontario Electric Railway Historical Association, Milton
- Fieldcote Memorial Park & Museum, Ancaster
- Dundurn National Historic Site, Hamilton
Huron, Perth, Waterloo and Wellington
- Schneider Haus National Historic Site, Kitchener
- Ken Seiling Waterloo Region Museum, Kitchener
- Canadian Baseball Hall of Fame and Museum, St. Marys
- Kitchener-Waterloo Art Gallery, Kitchener
Greater Toronto Area
- Scarborough Historical Museum, Scarborough
- Bradley Museum, Mississauga
- Fort York, Toronto
- Spadina Museum: Historic House and Gardens, Toronto
- Colborne Lodge, Toronto
- Black Creek Pioneer Village, Toronto
- Lakeshore Grounds Interpretive Centre, Etobicoke
- Todmorden Mills, Toronto
- Osgoode Hall (The Law Society of Ontario), Toronto
York, Durham, and Headwaters
- Sharon Temple National Historic Site and Museum, Sharon
- Markham Museum, Markham
- Scugog Shores Museum Village & Archives, Port Perry
- Pickering Museum Village, Greenwood
- Georgina Pioneer Village and Archives, Keswick
Bruce Peninsula, Southern Georgian Bay and Lake Simcoe
- Leacock Museum National Historic Site, Orillia
- Museum of Dufferin, Mulmur
- Grey Roots Museum and Archives, Owen Sound
- Huronia Museum & Huron Ouendat Village, Midland
Kawarthas and Northumberland
- Sifton-Cook Heritage Centre, Cobourg
- Lang Pioneer Village Museum, Keene
South Eastern Ontario
- Bellevue House National Historic Site of Canada, Kingston
- Upper Canada Village, Morrisburg
- Glengarry Pioneer Museum, Dunvegan
Ottawa and Countryside
- Canadian Museum of Nature, Ottawa
Haliburton Highlands to the Ottawa Valley
- Minden Hills Museum, Minden
Muskoka, Parry Sound and Algonquin Park
- Algonquin Logging Museum, Whitney
- Muskoka Lakes Museum, Port Carling
Northern Ontario
- Petawawa Heritage Society/Village, Petawawa
- Mattawa Museum, Mattawa
- Ermatinger Clergue National Historic Site, Sault Ste. Marie
- Old Fort William, Thunder Bay
- Atikokan Centenniam Museum and Historical Park, Atikokan