Yellowknife · Northwest Territories · 2026–27 season
Snow Day Predictor YellowknifeWill school be cancelled tomorrow in Yellowknife?
Live overnight forecast for the City of Yellowknife, Old Town, Niven Lake, Range Lake, Frame Lake, Kam Lake, and the surrounding communities of Detah and N’Dilo. The predictor tunes to YK1 and Yellowknife Catholic Schools cold and storm thresholds, with French CSFTNO operations factored in separately.
Multi-model forecast, five-factor closure engine, province-aware results. No sign-up, no tracking of your queries.
What makes Yellowknife unique
Yellowknife is the NWT capital and the only Canadian city with both a public Yellowknife Education District (YK1) and a separate Yellowknife Catholic Schools (YCS) operating in the same Subarctic environment. Ice fog from vehicle exhaust in extreme cold is a signature local hazard.
Great Slave Lake basin forecast
Yellowknife snow day forecast, what to expect this winter
Yellowknife sits on the north shore of Great Slave Lake at 62.45 °N, deep inside the Continental Subarctic climate zone. Winter here is defined less by individual snowstorms and more by the duration and depth of cold. Average January highs sit near −22 °C and lows near −30 °C, with multi-day stretches below −40 °C several times each winter. Total annual snowfall is moderate by Canadian standards, around 150 cm, but it accumulates from October through April and rarely melts off, so the surface snowpack is continuous for six months. The forecast question for a Yellowknife school day is rarely "is it snowing?" It is almost always "is the wind chill safe to walk in, and can the buses actually start?"
School operations are split between three boards that all serve the same city. Yellowknife Education District No. 1 (YK1) is the public board, running elementary, middle, and secondary schools including Sir John Franklin High School and École Sir John Franklin programming. Yellowknife Catholic Schools (YCS) is a separate denominational board operating St. Joseph School, St. Patrick High School, and Weledeh Catholic School. The Commission scolaire francophone des Territoires du Nord-Ouest (CSFTNO) operates École Allain St-Cyr for francophone-rights students under section 23 of the Charter. All three boards make weather and cold calls independently, although in practice YK1 and YCS usually align because they share the same student walking corridors and bus routes.
Closures in Yellowknife are triggered by three distinct hazards: extreme wind chill (typically −55 °C and colder), ice fog dense enough to obscure roadway visibility, and full-on blizzards with blowing snow that closes the Ingraham Trail and the Detah ice road. Snow alone almost never closes a Yellowknife school. The community is built for winter, plowing is constant, and the buildings themselves are engineered for forty-below operations. What closes school is the combination: when wind chill, ice fog, and a stalled high-pressure cold dome arrive together, YK1 and YCS will call it the night before or by 6:00 am the morning of.
School boards
Yellowknife school boards we model
The boards and transportation operators that make the morning closure call for Yellowknife.
- Yellowknife Education District No. 1 (YK1)
Public school board for Yellowknife. Operates elementary, middle, and secondary schools across the city including Sir John Franklin High School. Closure decisions are typically released the night before or by 6:00 am on the morning of.
- Yellowknife Catholic Schools (YCS)
Separate denominational board operating St. Joseph School, St. Patrick High School, and Weledeh Catholic School. YCS makes its own weather calls but usually aligns with YK1 because the two boards share walking corridors and student demographics.
- Commission scolaire francophone des Territoires du Nord-Ouest (CSFTNO)
French-language board operating École Allain St-Cyr in Yellowknife under section 23 of the Charter. Smaller enrolment, separate transportation, and independent closure decisions.
Bus transportation
YK1 and Yellowknife Catholic Schools operate limited yellow bus service within the City of Yellowknife. Most students walk or are driven by family because the city is geographically compact. Bus and closure calls are released by 6:00 am the morning of, broadcast on CBC North Radio One and the boards’ websites. The Detah ice road and the winter route to N’Dilo close in extreme conditions, which can isolate students who normally commute in from those communities and prompt a same-day adjustment.
Local weather
Yellowknife’s signature winter weather patterns
The phenomena that produce most Yellowknife snow days.
- Continental subarctic deep cold
Wind chills past −40 °C are routine from December through February, with multi-day stretches below −50 °C in most winters. Yellowknife sits north of the main Pacific moisture track, so its winter weather is dominated by stable Arctic high-pressure domes rather than passing storms. Cold here is persistent, not episodic.
- Ice fog from vehicle exhaust and heating
In temperatures below roughly −35 °C, water vapour from car exhaust, household heating, and the city’s power plant freezes instantly into suspended ice crystals. The resulting ice fog can cut roadway visibility to under 100 metres along Franklin Avenue, the Old Airport Road, and Highway 3. It is a signature Yellowknife hazard with no real equivalent in southern Canada.
- Great Slave Lake influence
Great Slave Lake stays open into late November or early December most years, releasing latent heat to the immediate Yellowknife area. This delays the onset of the deepest cold by two to four weeks compared to communities further inland. Once the lake freezes over, the moderating effect disappears and temperatures drop sharply.
- December–January polar twilight
Around the winter solstice, Yellowknife receives only about 4 hours and 30 minutes of daylight, with the sun never rising more than a few degrees above the horizon. Civil twilight is the dominant lighting condition through morning bell at 8:30 am. Low-angle light, blowing snow, and ice crystals create persistent visibility challenges on walking routes to school.
- Spring late-season storms
April and May are statistically the snowiest months in Yellowknife, not January or February. Late-season storms can deposit 20–30 cm of heavy wet snow well after southern Canadian schools have switched to spring schedules. The April and May closure window is a real and recurring feature of the YK1 calendar.
History
Notable Yellowknife snow days in recent winters
Storms and ice events that shaped how Yellowknife school boards approach the morning call.
Multi-week Yellowknife extreme cold
February 2014A persistent Arctic high-pressure dome held Yellowknife below −40 °C wind chill for the better part of three weeks. YK1 and Yellowknife Catholic Schools both ran modified schedules, cancelling outdoor recess, holding indoor lunch, and waiving attendance penalties for cold-day absences. Bus service was reduced as multiple vehicles failed to start in the deepest morning lows.
January 2018 cold snap
January 2018Wind chills approached −55 °C across the Great Slave Lake region for several consecutive days. Outdoor activities were cancelled across YK1 and YCS, and the City of Yellowknife opened warming centres for residents without reliable heating. Schools stayed open as warming spaces during the day, with extended indoor recess and no after-school outdoor programming.
Pre-Christmas NT cold wave
December 2021A territory-wide cold event in the final school week before the December break dropped Yellowknife wind chills past −50 °C. YK1 modified bus operations and cancelled outdoor field trips; CSFTNO at École Allain St-Cyr made an independent call to shorten the school day for student safety on the walk home in the early-afternoon twilight.
Inuvik blizzard, broader NWT impact
March 2014A major blizzard centred on Inuvik in the western NWT shut down regional air links and highway routes across the territory. While Yellowknife itself remained operational, the storm disrupted student travel for residential and inter-community programs and reinforced how regional NWT weather events ripple into the capital’s school calendar.
Extended Yellowknife cold snap
February 2023Yellowknife held below −40 °C wind chill for more than a week in early February 2023, with ice fog reducing visibility along Franklin Avenue on multiple mornings. YK1 cancelled outdoor activities for the duration; YCS aligned the same day. Local mechanics reported a citywide spike in dead vehicle batteries, which delayed several morning bus routes.
Early-season ice fog event
November 2023A sharp cold snap in mid-November 2023 produced one of the densest ice fog episodes in recent memory along the Old Airport Road and through downtown Yellowknife. RCMP advised against non-essential driving; YK1 held buses on a delayed-start schedule and YCS waived late attendance penalties for students walking through the affected corridor.
FAQ
Yellowknife snow day frequently asked questions
The 7 questions Yellowknife parents and teachers ask us most.
Will YK1 close tomorrow?
Type "Yellowknife, Northwest Territories" or your local postal code into the predictor above. Yellowknife Education District No. 1 (YK1) closes infrequently because the city is built for cold, but it does cancel outdoor activities and occasionally close buildings during multi-day −55 °C wind chill events and dense ice fog. Official calls are released the night before or by 6:00 am on the morning of, broadcast on CBC North Radio One and the YK1 website.
What is ice fog and how does it affect Yellowknife schools?
Ice fog forms when water vapour from vehicle exhaust, household furnaces, and the city’s power plant freezes instantly in temperatures below roughly −35 °C, producing a suspended cloud of tiny ice crystals. Visibility along Franklin Avenue, the Old Airport Road, and Highway 3 can drop below 100 metres. YK1 and Yellowknife Catholic Schools watch ice fog closely because it affects both bus driver visibility and the safety of student walking routes; severe episodes can trigger delayed starts or full closures.
What wind chill closes Yellowknife schools?
There is no fixed threshold, but in practice YK1 and YCS rarely close school buildings for wind chill alone. Outdoor recess and outdoor physical education are normally cancelled at around −40 °C wind chill, and full closures or delayed starts are typically reserved for sustained −55 °C wind chill paired with ice fog, blowing snow, or vehicle-reliability concerns for the bus fleet. The combination matters more than any single number.
Does Yellowknife Catholic Schools always close with YK1?
Not always, but usually. YCS makes an independent decision but operates on the same streets, with the same student walking corridors, and under the same weather forecast as YK1. The two boards talk to each other on cold-call mornings and most weather closures end up aligned. Occasionally YCS will keep a school open for in-person learning that YK1 closes, or vice versa, when the specific building circumstances differ.
How is YK1 different from southern Canadian school boards?
YK1 is a much smaller board (under 2,000 students) operating in one of Canada’s coldest inhabited cities. Its closure protocols emphasize extreme cold, ice fog, and student walking safety far more than snowfall totals. Buildings are engineered for −45 °C operation, plowing is continuous, and a 20 cm snowfall that would close a southern Ontario board barely registers in Yellowknife. The board also coordinates closely with the City of Yellowknife and the GNWT Department of Education, Culture and Employment.
Will French CSFTNO schools close with YK1?
The Commission scolaire francophone des Territoires du Nord-Ouest operates École Allain St-Cyr in Yellowknife and makes its own weather decisions. CSFTNO often aligns with YK1 on extreme cold days because the students walk the same streets, but the board has section 23 protected programming and a smaller, separate transportation arrangement. On occasion CSFTNO will make a different call than YK1 for the same morning forecast.
How does the polar twilight affect winter school operations?
Around the December solstice, Yellowknife receives roughly 4 hours and 30 minutes of daylight, with sunrise after 10:00 am and sunset before 3:00 pm. Morning bus pickups and walks to school happen in full darkness, and the sun barely rises during recess. YK1 and YCS adjust outdoor activity scheduling to the brief midday daylight window, and the predictor factors twilight-period visibility into its bus-cancellation probability for the deep-winter months.
Looking for forecasts across the rest of Northwest Territories? View the Northwest Territories hub with all school boards, transportation consortia, weather zones, and a full city directory. Or browse the provinces & territories hub for every Canadian region.
Check your overnight snow day chance in Yellowknife now
The predictor pulls live multi-model forecast data for your exact Yellowknife postal code.
Run the Yellowknife predictor →