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Trail Mountain Fire, June 2018 Emery

Out · last detection 10 Jul 2018, 19:18 UTC

The fire started on 5 June 2018 in Emery, United States, and satellites saw it burning for 36 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 7,417 hectares, spread across a single county.

It is the 23th largest in Utah since 2016 (of 165 with a page). Number 83 in United States in 2018, of 511.

Compare with…

Suggestions: Fly Canyon · 2016Black Canyon · 2026

Burnt area
7,417ha
official perimeter (MTBS / NIFC)
Duration
≈ 36days
5 Jun 2018 – 10 Jul 2018
Counties hit
1
counties
Started on
5 Jun
2018
Heat detections
1,172
in a single hotspot: 1,023 MW
Danger at start
28
High · FWI index
Average daily power
1.3GW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 5 Jun10 Jul
10 Jul 2018

How it evolved, day by day

5 Jun 2018 · 1,039 MW · 15 6 Jun 2018 · 435 MW · 28 7 Jun 2018 · 2,721 MW · 35 8 Jun 2018 · 152 MW · 33 9 Jun 2018 · 22 MW · 7 10 Jun 2018 · 37 MW · 6 11 Jun 2018 · 7,621 MW · 111 12 Jun 2018 · 4,580 MW · 245 13 Jun 2018 · 1,595 MW · 81 14 Jun 2018 · 1,551 MW · 124 15 Jun 2018 · 8,023 MW · 132 16 Jun 2018 · 33 MW · 9 18 Jun 2018 · 1,077 MW · 37 19 Jun 2018 · 544 MW · 53 20 Jun 2018 · 2,271 MW · 54 21 Jun 2018 · 2,915 MW · 59 22 Jun 2018 · 697 MW · 96 23 Jun 2018 · 120 MW · 20 24 Jun 2018 · 10 MW · 7 25 Jun 2018 · 2 MW · 4 27 Jun 2018 · 12 MW · 7 28 Jun 2018 · 7 MW · 3 30 Jun 2018 · 2 MW · 2 1 Jul 2018 · 1 MW · 1 6 Jul 2018 · 1 MW · 1 9 Jul 2018 · 23 MW · 1 10 Jul 2018 · 12 MW · 1
5 Jun 9 Jun 13 Jun 15 Jun 18 Jun 22 Jun 27 Jun 6 Jul

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

The weather it burned in

30°high
70km/h · peak gust
2%lowest humidity

It had gone 3 days without rain (1 mm or more) when it started. Rain came after the fire: 3.1 mm on 11 Jul.

This area had burned before

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

How big is it?

10 km
It burned the equivalent of 4.7% of the area of London (74 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

  1. Emery where it started
    7,454 ha reached on 5 Jun
    0.6 %

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 2020
Built-up area0.11 ha
Residents< 20

Inside the perimeter there were about 0.11 hectares of 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)
5 Jun 26.7 °C 8 % 43 km/h 0.0 mm High 28
6 Jun 25.3 °C 10 % 46 km/h 0.0 mm High 30
7 Jun 25.1 °C 10 % 50 km/h 0.0 mm High 33
8 Jun 26.3 °C 7 % 41 km/h 0.0 mm High 31
9 Jun 27.7 °C 7 % 56 km/h 0.0 mm Very high 40
10 Jun 20.4 °C 14 % 63 km/h 0.0 mm Very high 40
11 Jun 24.2 °C 7 % 54 km/h 0.0 mm Very high 38
12 Jun 26.0 °C 11 % 38 km/h 0.0 mm High 36
13 Jun 29.9 °C 7 % 47 km/h 0.0 mm Very high 39
14 Jun 27.5 °C 7 % 56 km/h 0.0 mm Very high 45
15 Jun 25.9 °C 14 % 67 km/h 0.4 mm Very high 47
16 Jun 23.5 °C 22 % 49 km/h 0.3 mm High 36
17 Jun 22.7 °C 22 % 60 km/h 1.8 mm Moderate 18
18 Jun 22.5 °C 9 % 52 km/h 0.0 mm High 34
19 Jun 21.1 °C 20 % 54 km/h 0.0 mm High 35
20 Jun 24.6 °C 14 % 46 km/h 0.0 mm High 35
21 Jun 28.3 °C 7 % 69 km/h 0.0 mm Extreme 51
22 Jun 24.2 °C 12 % 59 km/h 0.0 mm Very high 47
23 Jun 26.4 °C 7 % 70 km/h 0.0 mm Extreme 54
24 Jun 24.0 °C 13 % 44 km/h 0.0 mm Very high 43
25 Jun 27.9 °C 8 % 50 km/h 0.0 mm Very high 45
26 Jun 30.3 °C 8 % 50 km/h 0.0 mm Very high 48
27 Jun 30.5 °C 5 % 45 km/h 0.0 mm Extreme 51
28 Jun 29.6 °C 2 % 63 km/h 0.0 mm Extreme 62
29 Jun 24.3 °C 11 % 60 km/h 0.0 mm Extreme 55
30 Jun 22.4 °C 17 % 56 km/h 0.0 mm Very high 48
1 Jul 25.7 °C 10 % 49 km/h 0.0 mm Very high 46
2 Jul 27.7 °C 8 % 60 km/h 0.0 mm Extreme 52
3 Jul 27.7 °C 6 % 60 km/h 0.0 mm Extreme 56
4 Jul 28.3 °C 7 % 48 km/h 0.0 mm Very high 50
5 Jul 28.1 °C 8 % 46 km/h 0.9 mm Very high 44
6 Jul 29.1 °C 16 % 37 km/h 0.0 mm Very high 39
7 Jul 29.2 °C 15 % 40 km/h 0.0 mm Very high 40
8 Jul 29.2 °C 18 % 34 km/h 0.6 mm High 34
9 Jul 28.3 °C 22 % 33 km/h 1.4 mm High 23
10 Jul 28.4 °C 18 % 41 km/h 1.0 mm High 29
11 Jul after 26.6 °C 24 % 34 km/h 3.1 mm Low 8

Before and after, from space

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

Before · 29 May 2018
After · 17 Jul 2018

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 · 1,172Every 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 timeSatelliteFRP (MW)LatLon

Other fires nearby

All fires in United States ›

Frequently asked questions

How long did the Trail Mountain Fire last?
The official perimeter only gives the start date (7 June 2018). The end comes from the heat detections inside the perimeter: it burned until 10 July 2018 (36 days from 5 June 2018), 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 7,417 hectares (74.2 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire only entered Emery (7,454 ha, 0.6 %).
What was the weather like?
During the fire the temperature reached 30.5 °C, humidity dropped to 2 % and gusts hit 70 km/h. The fire danger index (FWI) reached 62, class 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

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.

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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How we know this
  • Perimeter: MTBS (US Geological Survey and US Forest Service), 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. 1,172 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 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.