How long did the Mountain (North) fire last?

It burned between 18 May 2021 and 5 August 2021: 80 days, according to the dates recorded by Canada’s CWFIS and the heat detections seen by satellite.

How much area did it burn?

The official perimeter mapped by Canada’s CWFIS (Natural Resources Canada) is 1,161 hectares (11.6 km²). Other tallies, such as those of provincial agencies, may give slightly different figures.

Which census subdivisions burned?

The fire only entered Mountain (North) (1,157 ha, 1.2 %).

What was the weather like?

During the fire the temperature reached 36.5 °C, humidity dropped to 10 % and gusts hit 72 km/h. The fire danger index (FWI) reached 36, class High.

Where does this data come from?

From the official burnt perimeter of Canada’s CWFIS (NBAC, Natural Resources Canada) or, for the current season and until NBAC publishes it, the one rebuilt by GWIS (Copernicus); from NASA FIRMS VIIRS hotspots; and from the administrative boundaries of Canada. It is not an official report.

CA · Canada · 2021-05-18 → 2021-08-05

Mountain (North) fire, May 2021 Mountain (North)

Out · last detection 19 May 2021, 19:45 UTC

The fire started on 18 May 2021 in Mountain (North), Canada, and satellites saw it burning for 80 days. Canada’s CWFIS (Natural Resources Canada) mapped an official burnt perimeter of 1,161 hectares from satellite imagery, spread across a single census subdivision.

It is the 469th largest in Manitoba since 2016 (of 509 with a page). Number 283 in Canada in 2021, of 304.

Compare with…

Suggestions: Division No. 19, Unorganized · 2018 Mountain (North) · 2025 Division No. 19, Unorganized · 2018

Burnt area: 1,161ha; official perimeter (CWFIS)
Duration: 80days; 18 May 2021 – 5 Aug 2021
Census subdivisions hit: 1; municipalities
Started on: 18 May; 2021
Heat detections: 52; in a single hotspot: 170 MW
Danger at start: 36; High · FWI index
Average daily power: 1.2GW; detected power per day, on average

HOTSPOTS BY DAY 18 May5 Aug

Play back 19 May 2021

How it evolved, day by day

18 May 19 May

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

36°high

72km/h · peak gust

10%lowest humidity

It had gone 14 days without rain (1 mm or more) when it started. Rain came after the fire: 3.9 mm on 6 Aug.

This area had burned before

No earlier perimeters overlap this fire since 2016, when the satellite record begins.

How big is it?

It burned the equivalent of 0.7% of the area of London (12 km² against 1,583 km²).

London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).

This compares size, not location: both shapes are at the same scale, north up, centred on each other.

What happened to each census subdivision

Mountain (North) where it started

1,157 ha reached on 18 May

1.2 %

Burnt area inside each census subdivision, from crossing the official perimeter with administrative boundaries. The distance runs from the point marking the centre of each area to the nearest fire: staying a kilometre away does not mean it reached the houses.

People and buildings inside the perimeter

GHSL 2020

Built-up area< 0.1 ha

Residents< 20

Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2020, satellite-based estimate).

This is an estimate on 100 m cells, made from satellite imagery and census data: it does not mean that homes burned or that anyone was harmed. The perimeter also contains land that never burned.

Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu

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)
18 May	33.9 °C	13 %	53 km/h	0.0 mm	High 36
19 May	21.3 °C	21 %	57 km/h	0.6 mm	High 30
20 May	3.5 °C	58 %	40 km/h	1.7 mm	Very low 4
21 May	2.6 °C	87 %	35 km/h	11.1 mm	Very low 0
22 May	9.4 °C	63 %	27 km/h	0.0 mm	Very low 0
23 May	17.2 °C	50 %	28 km/h	0.0 mm	Very low 1
24 May	20.6 °C	43 %	60 km/h	4.1 mm	Very low 3
25 May	10.6 °C	69 %	59 km/h	4.3 mm	Very low 0
26 May	10.0 °C	33 %	31 km/h	0.0 mm	Very low 1
27 May	17.4 °C	21 %	36 km/h	0.0 mm	Low 6
28 May	21.5 °C	28 %	59 km/h	0.0 mm	Moderate 16
29 May	19.8 °C	26 %	60 km/h	0.0 mm	Moderate 20
30 May	17.9 °C	34 %	35 km/h	0.0 mm	Moderate 15
31 May	28.2 °C	10 %	41 km/h	0.0 mm	High 25
1 Jun	23.0 °C	36 %	34 km/h	0.0 mm	Moderate 17
2 Jun	32.1 °C	23 %	41 km/h	0.8 mm	High 22
3 Jun	29.9 °C	35 %	35 km/h	0.6 mm	Moderate 17
4 Jun	29.0 °C	22 %	44 km/h	0.0 mm	High 26
5 Jun	33.6 °C	18 %	59 km/h	0.0 mm	High 35
6 Jun	22.2 °C	44 %	70 km/h	2.9 mm	Low 8
7 Jun	23.1 °C	37 %	42 km/h	0.5 mm	Moderate 12
8 Jun	27.3 °C	19 %	25 km/h	0.0 mm	Moderate 19
9 Jun	20.1 °C	67 %	38 km/h	7.3 mm	Very low 1
10 Jun	16.9 °C	79 %	46 km/h	0.0 mm	Very low 3
11 Jun	18.5 °C	89 %	49 km/h	45.4 mm	Very low 0
12 Jun	24.6 °C	29 %	55 km/h	8.0 mm	Very low 1
13 Jun	26.9 °C	25 %	33 km/h	0.0 mm	Low 7
14 Jun	27.7 °C	34 %	28 km/h	0.0 mm	Low 10
15 Jun	28.4 °C	36 %	43 km/h	0.0 mm	Moderate 14
16 Jun	27.8 °C	36 %	72 km/h	0.0 mm	Moderate 21
17 Jun	23.2 °C	33 %	66 km/h	0.0 mm	Moderate 21
18 Jun	19.0 °C	42 %	33 km/h	0.4 mm	Moderate 12
19 Jun	20.1 °C	44 %	31 km/h	0.0 mm	Moderate 12
20 Jun	14.4 °C	43 %	48 km/h	0.3 mm	Moderate 14
21 Jun	18.7 °C	31 %	37 km/h	0.1 mm	Moderate 14
22 Jun	25.9 °C	39 %	36 km/h	0.0 mm	Moderate 14
23 Jun	23.1 °C	39 %	56 km/h	0.7 mm	Moderate 15
24 Jun	24.6 °C	34 %	47 km/h	0.0 mm	Moderate 18
25 Jun	28.2 °C	32 %	40 km/h	2.2 mm	Low 9
26 Jun	25.6 °C	47 %	32 km/h	1.9 mm	Very low 4
27 Jun	22.9 °C	55 %	43 km/h	12.2 mm	Very low 1
28 Jun	26.5 °C	39 %	23 km/h	0.0 mm	Very low 4
29 Jun	30.9 °C	35 %	31 km/h	0.0 mm	Moderate 12
30 Jun	30.6 °C	45 %	26 km/h	0.0 mm	Moderate 12
1 Jul	33.0 °C	35 %	21 km/h	0.0 mm	Moderate 15
2 Jul	35.5 °C	26 %	35 km/h	0.0 mm	High 24
3 Jul	36.5 °C	28 %	34 km/h	2.1 mm	Moderate 16
4 Jul	28.7 °C	36 %	45 km/h	3.9 mm	Low 6
5 Jul	18.2 °C	67 %	33 km/h	0.3 mm	Low 6
6 Jul	18.3 °C	47 %	24 km/h	2.5 mm	Very low 2
7 Jul	24.1 °C	31 %	25 km/h	0.0 mm	Low 8
8 Jul	27.0 °C	35 %	26 km/h	0.0 mm	Moderate 13
9 Jul	31.0 °C	26 %	18 km/h	0.0 mm	Moderate 18
10 Jul	34.5 °C	22 %	20 km/h	0.0 mm	High 23
11 Jul	33.3 °C	25 %	41 km/h	3.5 mm	Moderate 13
12 Jul	25.2 °C	50 %	44 km/h	14.7 mm	Very low 1
13 Jul	22.5 °C	52 %	29 km/h	1.6 mm	Very low 1
14 Jul	25.0 °C	49 %	22 km/h	0.3 mm	Very low 4
15 Jul	32.4 °C	28 %	34 km/h	0.3 mm	Moderate 16
16 Jul	30.5 °C	43 %	28 km/h	0.6 mm	Moderate 14
17 Jul	23.1 °C	73 %	37 km/h	5.7 mm	Very low 1
18 Jul	27.7 °C	60 %	38 km/h	0.0 mm	Very low 4
19 Jul	19.5 °C	67 %	32 km/h	0.7 mm	Very low 4
20 Jul	21.4 °C	74 %	34 km/h	8.8 mm	Very low 0
21 Jul	25.8 °C	72 %	27 km/h	1.2 mm	Very low 0
22 Jul	28.8 °C	60 %	34 km/h	0.3 mm	Very low 3
23 Jul	27.5 °C	23 %	60 km/h	0.2 mm	Moderate 19
24 Jul	27.7 °C	31 %	56 km/h	0.0 mm	Moderate 19
25 Jul	26.2 °C	30 %	43 km/h	0.0 mm	Moderate 18
26 Jul	26.2 °C	37 %	25 km/h	0.0 mm	Moderate 14
27 Jul	31.4 °C	30 %	28 km/h	0.3 mm	Moderate 17
28 Jul	27.8 °C	27 %	40 km/h	0.0 mm	Moderate 21
29 Jul	31.5 °C	24 %	41 km/h	0.0 mm	High 25
30 Jul	30.1 °C	26 %	42 km/h	0.2 mm	High 27
31 Jul	27.1 °C	26 %	40 km/h	0.0 mm	High 25
1 Aug	30.3 °C	24 %	22 km/h	0.0 mm	High 23
2 Aug	33.1 °C	24 %	25 km/h	0.0 mm	High 25
3 Aug	31.3 °C	35 %	35 km/h	0.8 mm	High 22
4 Aug	20.7 °C	76 %	28 km/h	15.4 mm	Very low 0
5 Aug	22.9 °C	47 %	26 km/h	0.7 mm	Very low 2
6 Aug after	25.8 °C	58 %	26 km/h	3.9 mm	Very low 1

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

↔

Before · 11 May 2021

After · 12 Aug 2021

Before After

If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.

Detections table · 52Every satellite heat detection, one by one, with time, satellite, power and coordinates.

⬇ Download CSV Times in UTC. Each detection is a 375 m pixel: a large fire yields hundreds per pass.

Date and time	Satellite	FRP (MW)	Lat	Lon

Other fires nearby

All fires in Canada ›

Frequently asked questions

How long did the Mountain (North) fire last?: It burned between 18 May 2021 and 5 August 2021: 80 days, according to the dates recorded by Canada’s CWFIS and the heat detections seen by satellite.
How much area did it burn?: The official perimeter mapped by Canada’s CWFIS (Natural Resources Canada) is 1,161 hectares (11.6 km²). Other tallies, such as those of provincial agencies, may give slightly different figures.
Which census subdivisions burned?: The fire only entered Mountain (North) (1,157 ha, 1.2 %).
What was the weather like?: During the fire the temperature reached 36.5 °C, humidity dropped to 10 % and gusts hit 72 km/h. The fire danger index (FWI) reached 36, class High.
Where does this data come from?: From the official burnt perimeter of Canada’s CWFIS (NBAC, Natural Resources Canada) or, for the current season and until NBAC publishes it, the one rebuilt by GWIS (Copernicus); from NASA FIRMS VIIRS hotspots; and from the administrative boundaries of Canada. 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 · Emergency number and official warnings ›

Satellite cross-check

NASA FIRMS ↗
CWFIS · Interactive map ↗

History of this page Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

No changes since 24 October 2026.

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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.

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What really happened?

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We will only use your email to reply about this report. Privacy. This is not an emergency service: if there is a fire now, call 911.

How we know this

Perimeter: NBAC (Natural Resources Canada), official.
Dates from the perimeter: the VIIRS detections inside it did not change them. 52 Suomi-NPP VIIRS detections on those dates.
We have not matched this page with any official record.
Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
Built-up area and population come from the JRC Global Human Settlement Layer (epoch 2020, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.

How we build fire pages: methodology ›

Where this data comes from

The perimeter is official: it comes from the National Burned Area Composite (NBAC) of the Canadian Wildland Fire Information System (CWFIS), Natural Resources Canada, which maps it on satellite imagery and publishes it under the Open Government Licence – Canada. Until NBAC publishes the current season, this year’s fires carry the perimeter rebuilt from heat detections by GWIS (Copernicus, CC BY 4.0), which is approximate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Census subdivision boundaries come from geoBoundaries ADM3 (Open Data Commons Open Database License 1.0). The area per census subdivision is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from official figures.

Where it burned