How long did the Halfway Hill Fire last?

The official perimeter only gives the start date (8 July 2022). The end comes from the heat detections inside the perimeter: it burned until 23 July 2022 (16 days from 8 July 2022), 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 4,915 hectares (49.2 km²). Other tallies, such as daily incident reports, may give slightly different figures.

Which counties burned?

The fire entered 2 counties: Millard (4,897 ha, 0.3 %); Sevier (3 ha, 0.0 %).

What was the weather like?

During the fire the temperature reached 34.3 °C, humidity dropped to 7 % and gusts hit 57 km/h. The fire danger index (FWI) reached 60, 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.

US · United States · 2022-07-08 → 2022-07-23

Halfway Hill Fire, July 2022 Millard, Sevier

Out · last detection 23 Jul 2022, 08:59 UTC

The fire started on 8 July 2022 in Millard, United States, and satellites saw it burning for 16 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 4,915 hectares, spread across 2 counties.

It is the 38th largest in Utah since 2016 (of 165 with a page). Number 101 in United States in 2022, of 493.

Compare with…

Suggestions: Meadow Creek · 2019 Widemouth 2 · 2026 Wild Goose · 2026 Lower Ebbs · 2016

Burnt area: 4,915ha; official perimeter (MTBS / NIFC)
Duration: ≈ 16days; 8 Jul 2022 – 23 Jul 2022
Counties hit: 2; counties
Started on: 8 Jul; 2022
Heat detections: 450; in a single hotspot: 279 MW
Danger at start: 54; Extreme · FWI index
Average daily power: 653MW; detected power per day, on average

HOTSPOTS BY DAY 8 Jul23 Jul

Play back 23 Jul 2022

How it evolved, day by day

9 Jul 11 Jul 15 Jul 17 Jul 20 Jul 22 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

34°high

57km/h · peak gust

7%lowest humidity

It had gone 7 days without rain (1 mm or more) when it started. Rain came after the fire: 2.2 mm on 24 Jul.

This area had burned before

2% of the perimeter overlaps earlier fires recorded since 2016: 88 ha in 2019.

88 ha Meadow Creek fire, September 2019 1,694 ha in total; the hectares shown are those it shares with this fire

How big is it?

It burned the equivalent of 3.1% of the area of London (49 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

Millard where it started

4,897 ha reached on 9 Jul

0.3 %
Sevier

3 ha reached on 10 Jul

0.0 %

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 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)
8 Jul	32.2 °C	7 %	42 km/h	0.0 mm	Extreme 54
9 Jul	33.4 °C	10 %	57 km/h	0.3 mm	Extreme 60
10 Jul	32.3 °C	11 %	40 km/h	0.0 mm	Extreme 51
11 Jul	31.7 °C	12 %	36 km/h	0.0 mm	Very high 48
12 Jul	32.3 °C	13 %	34 km/h	0.1 mm	Very high 46
13 Jul	32.3 °C	16 %	46 km/h	0.9 mm	Very high 39
14 Jul	31.1 °C	20 %	49 km/h	0.9 mm	High 35
15 Jul	27.9 °C	26 %	44 km/h	2.4 mm	Moderate 18
16 Jul	32.7 °C	14 %	35 km/h	0.0 mm	Very high 38
17 Jul	34.0 °C	14 %	43 km/h	0.0 mm	Very high 47
18 Jul	32.2 °C	16 %	49 km/h	0.4 mm	Very high 48
19 Jul	31.5 °C	16 %	42 km/h	0.7 mm	Very high 44
20 Jul	31.3 °C	14 %	45 km/h	0.0 mm	Very high 46
21 Jul	32.9 °C	12 %	33 km/h	0.0 mm	Very high 44
22 Jul	34.3 °C	11 %	48 km/h	0.0 mm	Extreme 52
23 Jul	32.6 °C	14 %	51 km/h	0.0 mm	Extreme 56
24 Jul after	27.8 °C	20 %	44 km/h	2.2 mm	High 22

Before and after, from space

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

↔

Before · 1 Jul 2022

After · 30 Jul 2022

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 · 450Every 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 Halfway Hill Fire last?: The official perimeter only gives the start date (8 July 2022). The end comes from the heat detections inside the perimeter: it burned until 23 July 2022 (16 days from 8 July 2022), 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 4,915 hectares (49.2 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?: The fire entered 2 counties: Millard (4,897 ha, 0.3 %); Sevier (3 ha, 0.0 %).
What was the weather like?: During the fire the temperature reached 34.3 °C, humidity dropped to 7 % and gusts hit 57 km/h. The fire danger index (FWI) reached 60, 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

NASA FIRMS ↗
NIFC · Fire maps ↗

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

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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. 450 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.

Where it burned