howmuchsun

Vitamin D from sunlight in Canada

How long you need in the sun to make vitamin D, and when the sun is too low to make any at all, for 64 cities in Canada.

CityLatitudeElevationVitamin D winter
Toronto 43.71°N 161 m 20 Oct – 1 Mar (133 days)
Montréal 45.51°N 216 m 14 Oct – 7 Mar (145 days)
Calgary 51.05°N 1,048 m 30 Sep – 23 Mar (175 days)
Ottawa 45.41°N 71 m 14 Oct – 7 Mar (145 days)
Edmonton 53.55°N 668 m 21 Sep – 1 Apr (193 days)
Winnipeg 49.88°N 245 m 29 Sep – 23 Mar (176 days)
Mississauga 43.58°N 159 m 20 Oct – 1 Mar (133 days)
Vancouver 49.25°N 70 m 5 Oct – 17 Mar (164 days)
Brampton 43.68°N 221 m 20 Oct – 1 Mar (133 days)
Hamilton 43.25°N 95 m 21 Oct – 28 Feb (131 days)
Surrey 49.11°N 82 m 5 Oct – 17 Mar (164 days)
Québec 46.81°N 54 m 10 Oct – 12 Mar (154 days)
Halifax 44.64°N 60 m 18 Oct – 3 Mar (137 days)
Laval 45.57°N 34 m 14 Oct – 8 Mar (146 days)
London 42.98°N 252 m 22 Oct – 26 Feb (128 days)
Etobicoke 43.64°N 138 m 20 Oct – 1 Mar (133 days)
Markham 43.87°N 168 m 19 Oct – 2 Mar (135 days)
Vaughan 43.84°N 218 m 19 Oct – 1 Mar (134 days)
Gatineau 45.48°N 53 m 14 Oct – 7 Mar (145 days)
Victoria 48.44°N 18 m 7 Oct – 15 Mar (160 days)
Saskatoon 52.13°N 484 m 24 Sep – 29 Mar (187 days)
Kitchener 43.43°N 336 m 21 Oct – 28 Feb (131 days)
Burnaby 49.27°N 87 m 4 Oct – 18 Mar (166 days)
Windsor 42.30°N 190 m 24 Oct – 24 Feb (124 days)
Longueuil 45.52°N 29 m 14 Oct – 7 Mar (145 days)
Regina 50.45°N 577 m 29 Sep – 23 Mar (176 days)
Oakville 43.45°N 99 m 20 Oct – 28 Feb (132 days)
Richmond 49.17°N 9 m 5 Oct – 17 Mar (164 days)
Richmond Hill 43.87°N 232 m 19 Oct – 1 Mar (134 days)
Burlington 43.39°N 165 m 21 Oct – 28 Feb (131 days)
Nepean 45.34°N 87 m 14 Oct – 7 Mar (145 days)
Oshawa 43.90°N 105 m 19 Oct – 2 Mar (135 days)
Greater Sudbury 46.49°N 266 m 11 Oct – 11 Mar (152 days)
Gloucester 45.35°N 93 m 14 Oct – 7 Mar (145 days)
Saguenay 48.42°N 84 m 5 Oct – 17 Mar (164 days)
Coquitlam 49.28°N 39 m 4 Oct – 18 Mar (166 days)
Barrie 44.40°N 269 m 18 Oct – 3 Mar (137 days)
Rosemont–La Petite-Patrie 45.54°N 57 m 14 Oct – 7 Mar (145 days)
Villeray–Saint-Michel–Parc-Extension 45.56°N 53 m 14 Oct – 7 Mar (145 days)
Kelowna 49.88°N 350 m 3 Oct – 20 Mar (169 days)
Trois-Rivières 46.35°N 16 m 11 Oct – 10 Mar (151 days)
Guelph 43.55°N 335 m 21 Oct – 28 Feb (131 days)
Lévis 46.80°N 87 m 10 Oct – 11 Mar (153 days)
Mercier–Hochelaga-Maisonneuve 45.57°N 26 m 14 Oct – 8 Mar (146 days)
Abbotsford 49.06°N 114 m 5 Oct – 17 Mar (164 days)
Whitby 43.88°N 87 m 19 Oct – 2 Mar (135 days)
St. Catharines 43.17°N 102 m 21 Oct – 27 Feb (130 days)
Milton 43.52°N 195 m 20 Oct – 28 Feb (132 days)
Langley 49.10°N 13 m 5 Oct – 17 Mar (164 days)
Kingston 44.23°N 70 m 18 Oct – 3 Mar (137 days)
Cambridge 43.36°N 272 m 21 Oct – 28 Feb (131 days)
Sherbrooke 45.40°N 175 m 15 Oct – 6 Mar (143 days)
Orléans 45.46°N 89 m 14 Oct – 7 Mar (145 days)
Ottawa South 45.39°N 62 m 14 Oct – 7 Mar (145 days)
Saint-Louis-de-Terrebonne 45.70°N 64 m 13 Oct – 8 Mar (147 days)
Ajax 43.85°N 97 m 19 Oct – 2 Mar (135 days)
Saanich 48.55°N 19 m 7 Oct – 15 Mar (160 days)
Thornhill 43.82°N 175 m 19 Oct – 1 Mar (134 days)
Rivière-des-Prairies–Pointe-aux-Trembles 45.64°N 31 m 14 Oct – 8 Mar (146 days)
Terrebonne 45.70°N 18 m 13 Oct – 8 Mar (147 days)
Kamloops 50.67°N 414 m 30 Sep – 22 Mar (174 days)
Red Deer 52.27°N 856 m 25 Sep – 27 Mar (184 days)
Airdrie 51.30°N 1,086 m 29 Sep – 23 Mar (176 days)
Prince George 53.92°N 578 m 21 Sep – 1 Apr (193 days)

The same sun that makes vitamin D also burns. UV index and sunburn times in Canada →

How these dates are calculated