Mackenzie County fire, May 2025 Mackenzie County
The fire started on 30 May 2025 in Mackenzie County, Canada, and satellites saw it burning for 7 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 31,360 hectares from heat detections, spread across a single municipality.
It is the 29th largest in Alberta since 2016 (of 243 with a page). Number 37 in Canada in 2025, of 669.
- Burnt area
- 31,360ha
- GWIS perimeter (Copernicus)
- Duration
- 7days
- 30 May 2025 – 5 Jun 2025
- Municipalities hit
- 1
- municipalities
- Started on
- 30 May
- 2025
- Heat detections
- 3,312
- in a single hotspot: 369 MW
- Danger at start
- 29
- High · FWI index
- Energy released
- 25.4GW
- sum of detected power
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone 6 days without rain (1 mm or more) when it started. Rain came after the fire: 5.7 mm on 15 Jun.
This area had burned before
2% of the perimeter overlaps earlier fires recorded since 2016: 556 ha in 2023.
What happened to each town
-
Mackenzie County where it started31,131 ha reached on 29 May0.4 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre to the nearest fire: staying a kilometre away does not mean it reached the houses.
The weather day by day
ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.
Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 29 May | 30.5 °C | 18 % | 62 km/h | 2.4 mm | High 29 |
| 30 May | 22.5 °C | 15 % | 50 km/h | 0.0 mm | High 34 |
| 31 May | 19.8 °C | 23 % | 34 km/h | 0.3 mm | High 28 |
| 1 Jun | 18.4 °C | 27 % | 63 km/h | 2.8 mm | Low 10 |
| 2 Jun | 18.7 °C | 28 % | 48 km/h | 1.3 mm | Moderate 12 |
| 3 Jun | 19.6 °C | 27 % | 36 km/h | 0.0 mm | Moderate 18 |
| 4 Jun | 22.2 °C | 22 % | 28 km/h | 0.0 mm | High 24 |
| 5 Jun | 24.3 °C | 26 % | 39 km/h | 0.0 mm | High 26 |
| 6 Jun after | 18.8 °C | 20 % | 62 km/h | 1.9 mm | Moderate 17 |
| 7 Jun after | 19.5 °C | 27 % | 46 km/h | 0.0 mm | High 22 |
| 8 Jun after | 26.7 °C | 27 % | 40 km/h | 1.1 mm | High 22 |
| 9 Jun after | 17.8 °C | 26 % | 61 km/h | 0.0 mm | High 31 |
| 10 Jun after | 17.2 °C | 42 % | 45 km/h | 0.6 mm | Moderate 19 |
| 11 Jun after | 18.8 °C | 31 % | 27 km/h | 0.0 mm | Moderate 19 |
| 12 Jun after | 18.9 °C | 30 % | 38 km/h | 0.0 mm | High 23 |
| 13 Jun after | 20.0 °C | 35 % | 33 km/h | 0.0 mm | High 22 |
| 14 Jun after | 20.4 °C | 38 % | 37 km/h | 0.0 mm | High 22 |
| 15 Jun after | 21.0 °C | 48 % | 30 km/h | 5.7 mm | Very low 3 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.
The smoke
CAMS · CopernicusOn 5 June 2025 the air beside the fire reached 406 µg/m³ of PM2.5. That day averaged 157: 10 times the WHO daily guideline (15).
Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.
Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)
Detections table · 3,312Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Mackenzie County fire last?
- GWIS (Copernicus) dates it between 30 May 2025 and 5 June 2025: 7 days between the first and last heat detection of the perimeter.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 31,360 hectares (313.6 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Mackenzie County (31,131 ha, 0.4 %).
- What was the weather like?
- During the fire the temperature reached 30.5 °C, humidity dropped to 15 % and gusts hit 63 km/h. The fire danger index (FWI) reached 34, class High.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Canada (geoBoundaries). It is not an official report.
Where to verify it
A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.
Emergency number: 911
- CIFFC · Canadian Interagency Forest Fire Centre ↗
- CWFIS · Canadian Wildland Fire Information System ↗
Satellite cross-check
Does something look wrong on this page?
This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.
Report an error
Where this data comes from
The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM3 (Open Data Commons Open Database License 1.0). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.