Kingston Ontario Snow Day Predictor & Calculator
Will LDSB close tomorrow?
Kingston Ontario is one of the most ice-storm-prone cities in Ontario. The city sits where Lake Ontario meets the St. Lawrence River — a geographic corridor that traps cold Arctic air at ground level while warm moist air flows in above it. This temperature inversion produces freezing rain 4 to 6 times per typical winter, and freezing rain — not snowfall — is the primary Limestone District School Board closure trigger.
The Limestone District School Board covers Kingston, Napanee, Gananoque, Sharbot Lake, and all of Frontenac and Lennox-Addington counties. Rural Frontenac County routes north of Kingston are the most vulnerable to winter conditions and frequently drive the board-wide closure decision. When LDSB closes, all 50 schools across the entire region close simultaneously.
LDSB Announcement Window
By 6:00 AM
Check at 9pm for an early read and again at 5am for the final pre-announcement probability. LDSB announces by 6:00 AM — covers Kingston, Napanee, Gananoque, and all of Frontenac County.
Kingston Ontario Ice Storm Capital — Why Freezing Rain Closes Schools
Most Ontario cities close for snow. Kingston closes for ice. Understanding the difference is critical for Kingston families.
Why Kingston Gets More Freezing Rain Than Any Other Ontario City
Kingston sits at the junction of Lake Ontario and the St. Lawrence River in the St. Lawrence lowland — a geographic corridor that creates temperature inversions. Cold Arctic air gets trapped at ground level while warm moist air flows in above it. Rain falls through the warm layer and freezes on contact with cold road surfaces. This pattern is rare in Toronto or Hamilton but occurs 4 to 6 times per typical Kingston winter.
5mm of Ice Closes Kingston Schools
LDSB closes schools when freezing rain accumulates to 5mm or more on rural Frontenac County roads. For comparison, urban Ontario boards typically require 15cm of snow to close. Kingston's ice storm exposure means LDSB closes at far lower precipitation totals than boards like TDSB — and the snowdayprediction.ca Kingston predictor is calibrated to this lower threshold.
What to watch for in Kingston: Environment Canada freezing rain warnings and freezing drizzle advisories are the primary LDSB closure signals — more reliable than snowfall forecasts. Any overnight freezing rain warning covering Kingston or Frontenac County is a strong closure indicator regardless of total accumulation.
Kingston Ontario School Boards — LDSB & ALCDSB
Two school boards serve Kingston — both cover the city and surrounding communities and almost always align on closure decisions.
Limestone District School Board
LDSB covers Kingston, Napanee, Gananoque, Sharbot Lake, and all of Frontenac and Lennox-Addington counties. Freezing rain is the most common closure trigger — not snowfall. Rural Frontenac County routes drive the closure threshold.
Algonquin and Lakeshore Catholic DSB
ALCDSB almost always aligns with LDSB — both boards monitor the same road conditions and typically announce within minutes of each other. Always verify at alcdsb.on.ca or @ALCDSB directly.
Verify Here When the Announcement Drops
Always verify from official sources — predictions update hourly but announcements are final.
LDSB Snow Day Predictor — Napanee, Gananoque & Frontenac County
LDSB covers a large geographic area. One predictor serves all communities.
Napanee Snow Day Predictor
Napanee and all of Lennox-Addington County fall under LDSB. When LDSB closes Kingston, Napanee schools close simultaneously. Use this predictor for Napanee school closures.
Gananoque Snow Day Predictor
Gananoque falls under LDSB. Located east of Kingston along the St. Lawrence River, Gananoque shares the same freezing rain exposure as Kingston. When LDSB closes, all Gananoque schools close simultaneously.
Sharbot Lake & North Frontenac
Rural Frontenac County communities including Sharbot Lake and North Frontenac fall under LDSB. These rural routes north of Kingston are the most vulnerable to winter conditions and frequently drive the board-wide closure decision.
One predictor covers all of Frontenac and Lennox-Addington: Whether you are in Kingston, Napanee, Gananoque, or anywhere in Frontenac County — snowdayprediction.ca Kingston Snow Day Predictor applies to your school. LDSB makes one decision for all 50 schools.
Kingston Ontario LDSB Snow Day History
Historical LDSB closure data — what storms actually closed Kingston schools and why.
Notable LDSB Closure Events
Major ice storm deposited 20mm of freezing rain across Kingston and Frontenac County overnight. LDSB closed all 50 schools. Highway 401 near Kingston reduced to one lane. Rural roads north of Kingston declared impassable by 3am.
Alberta clipper deposited 22cm across Kingston and eastern Ontario in 24 hours. LDSB closed. Highway 401 between Kingston and Brockville reduced to one lane. Rural Frontenac County routes unsafe by 4am.
Freezing rain deposited 12mm across Kingston and Lennox-Addington County. LDSB closed. One of the largest early-season freezing rain events on record for Kingston.
Worst Kingston winters on record for school closures
2008–2009 · 2013–2014 · 2022–2023 — these winters produced the highest number of LDSB closure events, with 2013–2014 notable for multiple back-to-back ice storm events across Frontenac County.
Kingston Road Conditions
Highway 401 · Highway 38 · County Road 38 · Frontenac County Roads
Highway 401 near Kingston and rural Frontenac County roads north toward Sharbot Lake are the key corridors monitored by LST and LDSB assessors. When these routes show ice accumulation warnings on 511on.ca alongside an active Environment Canada freezing rain warning, a full LDSB school closure is very likely. Check 511on.ca for live Ontario road conditions.
What Do Kingston Parents Think?
Will LDSB close tomorrow? Cast your vote — resets daily at midnight.
Community vote — not a prediction. Check the probability gauge above for the algorithm-based forecast.
Kingston Snow Day Tips for Parents
LDSB-specific advice based on how Kingston and Frontenac County school closures actually work.
Watch for Freezing Rain Warnings — Not Just Snow
In Kingston, Environment Canada freezing rain warnings are the most reliable LDSB closure signal. A freezing rain warning covering Kingston or Frontenac County overnight almost always results in a closure — regardless of total accumulation. Do not rely on snowfall forecasts alone when checking Kingston snow day probability.
Rural Frontenac County Routes Drive Closures
Kingston city streets may look manageable while rural Frontenac County roads north toward Sharbot Lake are impassable with ice. LDSB closes for the worst route across all 50 schools — do not look out your Kingston window and assume school is open. Always check limestone.on.ca or @LimestoneDSB directly before deciding.
CFRC 101.9 FM Is the Fastest Local Source
CFRC 101.9 FM and CBC Radio One 107.5 FM receive LDSB notifications simultaneously with the board website. Radio announcements often reach Kingston families faster than website checks during high-traffic storm mornings.
Check at 9pm and 5am
The 9pm check gives you the best early read — especially important in Kingston where freezing rain events can develop rapidly as temperatures drop overnight. The 5am check gives you the most accurate pre-announcement read just before LST and LDSB assessors report in. LDSB announces by 6:00 AM.
Eastern Ontario & Nearby Cities — Snow Day Predictor
Snow Day FAQ — Kingston Ontario & LDSB
Kingston Ontario questions about LDSB and ALCDSB school closure decisions.
What school board serves Kingston Ontario?
The Limestone District School Board (LDSB) serves public schools in Kingston, Napanee, Gananoque, Sharbot Lake, and all of Frontenac and Lennox-Addington counties. All 50 LDSB schools close simultaneously when a closure is called.
What time does LDSB announce school closures?
LDSB announces by 6:00 AM. The fastest sources are Twitter @LimestoneDSB and limestone.on.ca. CFRC 101.9 FM and CBC Radio One 107.5 FM also broadcast closure announcements from 6:00 AM.
Does ALCDSB close when LDSB closes?
Almost always. Algonquin and Lakeshore Catholic District School Board and LDSB monitor the same road conditions and typically announce within minutes of each other. Always verify at alcdsb.on.ca or @ALCDSB on Twitter directly.
Why does Kingston get so many ice storms?
Kingston sits at the junction of Lake Ontario and the St. Lawrence River in a geographic corridor that traps cold Arctic air at ground level while warm moist air flows in above it. This temperature inversion creates freezing rain that occurs 4 to 6 times per typical Kingston winter and is the most common LDSB closure trigger.
What triggers an LDSB school closure?
Freezing rain is the primary trigger — even 5mm of ice accumulation on rural Frontenac County roads triggers LDSB closures. Snowfall above 15cm overnight and rural route conditions north of Kingston toward Sharbot Lake are the secondary triggers. When LST cancels buses region-wide, LDSB almost always closes all schools.
Does LDSB cover Napanee and Gananoque?
Yes — LDSB covers Kingston, Napanee, Gananoque, Sharbot Lake, and all communities in Frontenac and Lennox-Addington counties. When LDSB closes, all 50 schools across this entire region close simultaneously. The snowdayprediction.ca Kingston Snow Day Predictor applies to all of these communities.