Snow Day Predictor SudburyWill school be cancelled tomorrow in Sudbury?

Type your Sudbury postal code or "Sudbury, Ontario" into the predictor above. The Rainbow District School Board makes its closure call based on overnight snowfall, wind chill, and road conditions across Greater Sudbury, Espanola, and Manitoulin. The predictor returns a building closure probability and a separate bus cancellation probability, since the Sudbury Student Services Consortium often cancels buses on days when Rainbow DSB keeps buildings open. Both numbers are tuned to historical Rainbow DSB decisions.

Sudbury Student Services Consortium typically cancels buses when wind chill is forecast to fall below minus 35 °C during the morning route window, and Rainbow DSB and Sudbury Catholic DSB often shift to modified operations when wind chill drops below minus 40 °C. Sudbury is one of the few Ontario cities where extreme cold alone, without any snow in the forecast, closes schools regularly. The trigger reflects frostbite risk at exposed rural bus stops in Lively, Capreol, Valley East, and the outlying communities.

When cold northwesterly winds cross the open waters of Georgian Bay, snow squall bands form and extend northeast through the Parry Sound corridor and into the Sudbury Basin. The pattern is most active from late October through January, before Georgian Bay fully freezes over. A single overnight band can drop 20 to 40 cm on Greater Sudbury while areas just outside the squall corridor see almost no accumulation. Environment Canada snow squall warnings for the Georgian Bay corridor are one of the strongest leading indicators of a next-morning bus cancellation.

Lively, Walden, Capreol, Valley East, Garson, and Hanmer are all part of the City of Greater Sudbury and served by Rainbow DSB, Sudbury Catholic DSB, CSPGNO, and CSC Nouvelon. The Sudbury Student Services Consortium operates rural bus routes through these communities, and those routes are usually the first cancelled in extreme cold or heavy snow events because of exposure at rural stops and longer drive distances. Enter your specific address into the predictor for the forecast at your exact coordinates rather than the city centre.

No. The Sudbury Catholic District School Board and Rainbow District School Board make independent building closure decisions, and they occasionally diverge on borderline weather days. Bus cancellations, however, are nearly always identical, because the Sudbury Student Services Consortium operates routes for both boards and calls cancellations system-wide. If Rainbow DSB closes buildings, Sudbury Catholic DSB usually does too, but the morning announcement should be verified on each board's official channel.

Sudbury averages around 260 cm of snow per year compared to roughly 120 cm in Toronto, and the season runs from mid-November to early April rather than December to mid-March. More importantly, extreme cold below minus 35 °C wind chill is a routine closure trigger in Sudbury and effectively never happens in Toronto. A Northern Ontario forecast that ignores wind chill misses half the snow day risk. Our Sudbury model treats wind chill as a first-class input alongside snowfall and freezing rain.

The Conseil scolaire public du Grand Nord de l'Ontario (CSPGNO) makes independent closure decisions for its Sudbury-area schools, but bus cancellations through the Sudbury Student Services Consortium apply to CSPGNO routes simultaneously with Rainbow DSB and the other boards. Building closures may differ on borderline days, especially when CSPGNO has schools in surrounding communities outside the City of Greater Sudbury that face different conditions. The same applies to CSC Nouvelon, the French Catholic board headquartered in Sudbury.