9 cities in Ontario
Toronto
M5H 2N2
Ottawa
K1A 0A9
Hamilton
L8P 4Y7
London
N6A 1B6
Kitchener
N2G 1A2
Windsor
N9A 1A1
Thunder Bay
P7B 5E1
Sudbury
P3E 1B5
Barrie
L4M 3B1
About snow days in Ontario
Ranges from lake-effect snow belts near the Great Lakes to cold continental conditions in the north. Ontario averages roughly 150 cm of snow per year.
Ontario school boards make independent closure decisions. Northern boards have higher thresholds than southern Ontario. Toronto rarely closes, while Ottawa, Sudbury, and Thunder Bay close more frequently for heavy snow and extreme cold.
How school closure decisions work in Ontario
School boards in Ontario consider multiple factors when deciding whether to close, delay, or hold classes on a snow day. Beyond raw snowfall totals, administrators evaluate ice accumulation on roads and sidewalks, wind chill temperatures that affect students waiting at bus stops, the timing of the storm relative to morning and afternoon commutes, and whether road crews have had enough time to clear primary bus routes.
Most school boards make their announcements between 6 AM and 7 AM on the day of the event, though some issue closures the evening before when a major storm is certain. Bus cancellations are often announced separately and may occur even when schools technically remain open.
Select a city above to check tomorrow's school closure probability using current weather forecast data for that area. For the most accurate prediction, check after 6 PM the evening before a potential snow day, when weather models are most reliable.