How long did the Iron Fire last?

The official perimeter only gives the start date (20 June 2026). The end comes from the heat detections inside the perimeter: it burned until 27 June 2026 (8 days from 20 June 2026), the last day with detections before more than 10 days in a row without any, so it is approximate.

How much area did it burn?

The official perimeter published by United States agencies (MTBS / NIFC) is 16,933 hectares (169.3 km²). Other tallies, such as daily incident reports, may give slightly different figures.

Which counties burned?

The fire entered 3 counties: Utah (9,455 ha, 1.7 %); Tooele (4,136 ha, 0.2 %); Juab (3,318 ha, 0.4 %).

What was the weather like?

During the fire the temperature reached 34.4 °C, humidity dropped to 3 % and gusts hit 71 km/h. The fire danger index (FWI) reached 78, class Very extreme.

Where does this data come from?

From the official burnt perimeter of United States agencies (MTBS / NIFC, public domain), NASA FIRMS VIIRS hotspots and the administrative boundaries of United States. It is not an official report.

US · United States · 2026-06-20 → 2026-06-27

Iron Fire, June 2026 Utah, Tooele, Juab

Out · last detection 27 Jun 2026, 20:25 UTC

The fire started on 20 June 2026 in Utah, United States, and satellites saw it burning for 8 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 16,933 hectares, spread across 3 counties.

It is the 11th largest in Utah since 2016 (of 165 with a page). Number 29 in United States in 2026, of 423.

Compare with…

Suggestions: Cherry · 2026 Goose Point · 2019 Knolls · 2020 William · 2020

Burnt area: 16,933ha; official perimeter (MTBS / NIFC)
Duration: ≈ 8days; 20 Jun 2026 – 27 Jun 2026
Counties hit: 3; counties
Started on: 20 Jun; 2026
Heat detections: 1,366; in a single hotspot: 991 MW
Danger at start: 61; Extreme · FWI index
Average daily power: 5.4GW; detected power per day, on average

HOTSPOTS BY DAY 20 Jun27 Jun

Play back 27 Jun 2026

How it evolved, day by day

20 Jun 22 Jun 23 Jun 24 Jun 26 Jun

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

The weather it burned in

34°high

71km/h · peak gust

3%lowest humidity

It had gone 20 days without rain (1 mm or more) when it started.

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 11% of the area of London (169 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 county

Utah where it started

9,455 ha reached on 20 Jun

1.7 %
Tooele

4,136 ha reached on 20 Jun

0.2 %
Juab

3,318 ha reached on 20 Jun

0.4 %

Burnt area inside each county, 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 2025

Built-up area0.28 ha

Residents< 20

Inside the perimeter there were about 0.28 hectares of built-up land and almost nobody lived there (GHSL 2025, 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. The GHSL 2025 epoch is a projection made from 2020 and earlier data.

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)
20 Jun	31.2 °C	10 %	46 km/h	0.0 mm	Extreme 61
21 Jun	28.9 °C	14 %	30 km/h	0.0 mm	Very high 50
22 Jun	32.8 °C	7 %	29 km/h	0.0 mm	Very high 48
23 Jun	34.4 °C	5 %	38 km/h	0.0 mm	Extreme 54
24 Jun	33.1 °C	7 %	55 km/h	0.0 mm	Very extreme 78
25 Jun	31.0 °C	16 %	37 km/h	2.2 mm	High 27
26 Jun	32.0 °C	3 %	71 km/h	0.0 mm	Very extreme 78
27 Jun	26.9 °C	10 %	68 km/h	0.0 mm	Very extreme 71
28 Jun after	19.6 °C	20 %	42 km/h	0.4 mm	Very high 46
29 Jun after	22.3 °C	13 %	25 km/h	0.5 mm	High 37
30 Jun after	25.9 °C	6 %	34 km/h	0.0 mm	Very high 43
1 Jul after	28.9 °C	6 %	38 km/h	0.0 mm	Extreme 50
2 Jul after	29.7 °C	7 %	32 km/h	0.0 mm	Very high 48
3 Jul after	31.4 °C	8 %	25 km/h	0.0 mm	Very high 43
4 Jul after	33.3 °C	6 %	23 km/h	0.0 mm	Very high 47
5 Jul after	34.2 °C	6 %	35 km/h	0.0 mm	Extreme 54
6 Jul after	34.0 °C	10 %	40 km/h	0.0 mm	Extreme 56
7 Jul after	34.0 °C	12 %	40 km/h	0.0 mm	Extreme 59

Before and after, from space

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

↔

Before · 13 Jun 2026

After · 4 Jul 2026

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.

The smoke

CAMS · Copernicus

On 25 June 2026 the air beside the fire reached 212 µg/m³ of PM2.5. That day averaged 85: 5.7 times the WHO daily guideline (15).

PM2.5 peak212 µg/m³

Days over the guideline6 days

PM10215 µg/m³

Optical depth1.10

WHO 15

18192021222324252627282930

Good Fair Moderate Poor Very poor Extremely poor

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 · 1,366Every 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 United States ›

Frequently asked questions

How long did the Iron Fire last?: The official perimeter only gives the start date (20 June 2026). The end comes from the heat detections inside the perimeter: it burned until 27 June 2026 (8 days from 20 June 2026), the last day with detections before more than 10 days in a row without any, so it is approximate.
How much area did it burn?: The official perimeter published by United States agencies (MTBS / NIFC) is 16,933 hectares (169.3 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?: The fire entered 3 counties: Utah (9,455 ha, 1.7 %); Tooele (4,136 ha, 0.2 %); Juab (3,318 ha, 0.4 %).
What was the weather like?: During the fire the temperature reached 34.4 °C, humidity dropped to 3 % and gusts hit 71 km/h. The fire danger index (FWI) reached 78, class Very extreme.
Where does this data come from?: From the official burnt perimeter of United States agencies (MTBS / NIFC, public domain), NASA FIRMS VIIRS hotspots and the administrative boundaries of United States. 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 ↗
NIFC · Fire maps ↗

History of this page · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

25 October 2026 Last day with fire: 26 June 2026 → 27 June 2026.

RSS Changes to this page

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 do you think is wrong?

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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: NIFC WFIGS (United States), official.
The official perimeter has no end date: the end is the last day with VIIRS detections inside the perimeter before a gap of more than 10 days (150 days at most), so it is approximate. 1,366 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 2025, 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 and in the public domain. For past years it comes from MTBS (Monitoring Trends in Burn Severity), run by the U.S. Geological Survey and the USDA Forest Service, which map it on Landsat and Sentinel-2 imagery. For the current and last year it comes from WFIGS at the National Interagency Fire Center (NIFC): incident perimeters mapped by fire crews, aircraft and imagery. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. County boundaries come from geoBoundaries ADM2 (Public Domain). The area per county is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from official figures.

Where it burned