Ground stop at YYZ (YYZ), Oct 29, 2026

EndedLow visibility halts departures at Toronto airport

Started: Thu, Oct 29, 10:34 AM UTC10:34 UTC
Ended: Thu, Oct 29, 11:56 AM UTC11:56 UTC
Duration: 1 hr 22 min
Cause: low visibility; Extended 1 time

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What happened

AI-written · may contain mistakes. Written from the advisory text and weather only.

Cause: Fog or poor visibility made it unsafe to land and take off, so air traffic control stopped departures headed to Toronto to keep planes from being sent into those conditions.

The ground stop began at 10:34 UTC and was set to run until 7:30 am Eastern. At 11:20 UTC it was extended to 8:00 am Eastern and a new advisory was issued. It ended at 11:56 UTC, lasting 1 hour and 22 minutes.

Impact by airline

No airline data was collected for this ground stop.

Airline numbers appear after the first sample, within about 20 minutes of the start.

Impact by region

Air traffic control centers whose departures to the airport were held.

Center	Status
ZAU	Held
ZDC	Held
ZNY	Held
ZOB	Held
ZBW	Held
ZID	Held
ZMP	Held

Timeline

Every change published while the ground stop was in effect, as seen each minute.

Oct 29, 10:34 AM UTC
Ground stop issued at YYZ for low visibility, until 7:30 am EDT. Departures held from ZAU, ZDC, ZNY, ZOB and 3 more.
Oct 29, 11:20 AM UTC
Extended until 8:00 am EDT.
Oct 29, 11:20 AM UTC
New advisory issued.
Read the advisory ↗
Oct 29, 11:56 AM UTC
Ground stop ended after 1 hr 22 min.

Advisories

The air traffic control advisories issued for this ground stop, as published.

Advisory 6003

CTL ELEMENT: CYYZ
ELEMENT TYPE: APT
ADL TIME: 1118Z
GROUND STOP PERIOD: 29/1103Z - 29/1200Z
DEP FACILITIES INCLUDED: (2ndTier) CZY ZAU ZDC ZNY ZOB ZBW ZID CZM
 ZMP CZU
PREVIOUS TOTAL, MAXIMUM, AVERAGE DELAYS: 365 / 61 / 24
NEW TOTAL, MAXIMUM, AVERAGE DELAYS: 863 / 104 / 58
PROBABILITY OF EXTENSION: MEDIUM
IMPACTING CONDITION: WEATHER / LOW VISIBILITY
COMMENTS: EXTENDED TO 1200Z

Original advisory ↗

Advisory 6002

CTL ELEMENT: CYYZ
ELEMENT TYPE: APT
ADL TIME: 1030Z
GROUND STOP PERIOD: 29/1020Z - 29/1130Z
DEP FACILITIES INCLUDED: (2ndTier) CZY ZAU ZDC ZNY ZOB ZBW ZID CZM
 ZMP CZU
PREVIOUS TOTAL, MAXIMUM, AVERAGE DELAYS: 0 / 0 / 0
NEW TOTAL, MAXIMUM, AVERAGE DELAYS: 500 / 66 / 36
PROBABILITY OF EXTENSION: MEDIUM
IMPACTING CONDITION: WEATHER / LOW VISIBILITY
COMMENTS: CURRENTLY CAT III CONDITIONS

Original advisory ↗

How it is measured

Status, timeline, cause and held centers: the national airspace status feed, checked every minute, and the air traffic control advisories it links to.
Delays by airline and region: departures and arrivals at YYZ 30 or more minutes late, by their estimated delay against the schedule, sampled every 10 minutes while the stop is active and once more after it ends.
Totals and cancellations: arrival and departure boards for YYZ, every 30 minutes while active and once more after the end. Delayed means 15 or more minutes late at YYZ; cancelled is the airline's cancelled status; codeshares count once. Flights scheduled from the start until an hour after the end are counted.
Held at origin: the same arrivals boards, which carry each flight's scheduled and actual departure from its origin. A flight is held when it is still scheduled, not departed, 15 or more minutes past its scheduled departure at a sample taken during the stop. In scope: its origin is in a held center or listed facility; flights from elsewhere are late for other reasons.
Inbound in the air: the same arrivals boards. At each board taken during the stop, a flight to YYZ is in the air when it has departed (en route, or with an actual departure time) and not landed, cancelled or diverted; one still shown in the air over an hour past its arrival estimate, or departed more than 18 hours earlier, is treated as stale and left out.
Diversions: an inbound flight marked diverted during the stop or the wrap-up after it (not one marked before it could have departed), or one still shown in the air 30+ minutes past its arrival estimate that ADS-B (by its ICAO call sign) then found on the ground at another airport, not its origin. The diversion airport is the airport ADS-B found it at, else the updated destination. Cancellations never count. Regional flights flown under another call sign can't be found on ADS-B, so their diversion airport may be unknown.
Aircraft on the ground and holding: ADS-B positions around YYZ, every 5 minutes; the airline is read from the call sign. Holding counts airline flights only (passenger, regional and cargo), not private, military or medical flights.
Weather: METARs, SIGMETs and weather alerts.
News: headline links filtered to this airport and these days; we show titles and links only.

Data sources are listed on the credits page.