How long did the Pine Hollow Fire last?

The official perimeter only gives the start date (18 July 2017). The end comes from the heat detections inside the perimeter: it burned until 20 August 2017 (34 days from 18 July 2017), 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 1,718 hectares (17.2 km²). Other tallies, such as daily incident reports, may give slightly different figures.

Which counties burned?

The fire only entered Coconino (1,735 ha, 0.0 %).

What was the weather like?

During the fire the temperature reached 30.7 °C, humidity dropped to 11 % and gusts hit 59 km/h. The fire danger index (FWI) reached 35, class High.

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 · 2017-07-18 → 2017-08-20

Pine Hollow Fire, July 2017 Coconino

Out · last detection 20 Aug 2017, 09:12 UTC

The fire started on 18 July 2017 in Coconino, United States, and satellites saw it burning for 34 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 1,718 hectares, spread across a single county.

It is the 151th largest in Arizona since 2016 (of 380 with a page). Number 282 in United States in 2017, of 619.

Compare with…

Suggestions: Castle · 2019 Three Lakes · 2023 Mangum · 2020 Ikes · 2019

Burnt area: 1,718ha; official perimeter (MTBS / NIFC)
Duration: ≈ 34days; 18 Jul 2017 – 20 Aug 2017
Counties hit: 1; counties
Started on: 18 Jul; 2017
Heat detections: 67; in a single hotspot: 34 MW
Danger at start: 5; Very low · FWI index
Average daily power: 76MW; detected power per day, on average

HOTSPOTS BY DAY 18 Jul20 Aug

Play back 20 Aug 2017

How it evolved, day by day

22 Jul 1 Aug 9 Aug 10 Aug 16 Aug 18 Aug 20 Aug

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

The weather it burned in

31°high

59km/h · peak gust

11%lowest humidity

It had gone 0 days without rain (1 mm or more) when it started. Rain came after the fire: 2.0 mm on 21 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 1.1% of the area of London (17 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

Coconino where it started

1,735 ha reached on 22 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 2015

Built-up area< 0.1 ha

Residents< 20

Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2015, 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 Jul	29.0 °C	27 %	30 km/h	6.7 mm	Very low 5
19 Jul	26.1 °C	33 %	38 km/h	0.0 mm	Moderate 14
20 Jul	26.5 °C	31 %	34 km/h	8.9 mm	Very low 3
21 Jul	26.5 °C	30 %	37 km/h	0.2 mm	Low 11
22 Jul	29.0 °C	23 %	35 km/h	0.6 mm	Moderate 21
23 Jul	29.1 °C	21 %	35 km/h	1.7 mm	Moderate 12
24 Jul	26.0 °C	31 %	24 km/h	1.0 mm	Moderate 12
25 Jul	18.5 °C	66 %	39 km/h	16.9 mm	Very low 0
26 Jul	26.3 °C	41 %	35 km/h	0.8 mm	Very low 3
27 Jul	27.5 °C	28 %	33 km/h	3.6 mm	Very low 2
28 Jul	27.4 °C	27 %	44 km/h	0.1 mm	Moderate 12
29 Jul	28.0 °C	23 %	34 km/h	0.6 mm	Moderate 17
30 Jul	29.2 °C	17 %	27 km/h	0.4 mm	High 21
31 Jul	28.8 °C	26 %	25 km/h	0.9 mm	Moderate 16
1 Aug	30.6 °C	15 %	38 km/h	0.0 mm	High 26
2 Aug	30.7 °C	22 %	28 km/h	0.9 mm	Moderate 19
3 Aug	28.2 °C	27 %	34 km/h	6.3 mm	Very low 3
4 Aug	24.5 °C	41 %	40 km/h	3.7 mm	Very low 2
5 Aug	22.2 °C	36 %	44 km/h	1.1 mm	Low 6
6 Aug	25.1 °C	30 %	42 km/h	0.1 mm	Moderate 14
7 Aug	25.7 °C	22 %	37 km/h	0.0 mm	Moderate 18
8 Aug	28.1 °C	16 %	36 km/h	0.0 mm	High 24
9 Aug	28.8 °C	11 %	44 km/h	0.0 mm	High 31
10 Aug	28.0 °C	22 %	38 km/h	3.5 mm	Low 6
11 Aug	25.9 °C	31 %	22 km/h	0.6 mm	Moderate 11
12 Aug	26.0 °C	34 %	45 km/h	1.8 mm	Low 8
13 Aug	24.7 °C	33 %	46 km/h	0.7 mm	Moderate 15
14 Aug	26.6 °C	11 %	59 km/h	0.0 mm	High 33
15 Aug	23.3 °C	11 %	48 km/h	0.0 mm	High 31
16 Aug	26.0 °C	15 %	38 km/h	0.0 mm	High 28
17 Aug	27.2 °C	18 %	27 km/h	0.0 mm	High 27
18 Aug	28.6 °C	13 %	27 km/h	0.0 mm	High 30
19 Aug	29.1 °C	12 %	36 km/h	0.0 mm	High 35
20 Aug	28.0 °C	17 %	38 km/h	2.4 mm	Moderate 14
21 Aug after	24.8 °C	28 %	36 km/h	2.0 mm	Low 9

Before and after, from space

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

↔

Before · 11 Jul 2017

After · 27 Aug 2017

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 · 67Every 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

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Frequently asked questions

How long did the Pine Hollow Fire last?: The official perimeter only gives the start date (18 July 2017). The end comes from the heat detections inside the perimeter: it burned until 20 August 2017 (34 days from 18 July 2017), 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 1,718 hectares (17.2 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?: The fire only entered Coconino (1,735 ha, 0.0 %).
What was the weather like?: During the fire the temperature reached 30.7 °C, humidity dropped to 11 % and gusts hit 59 km/h. The fire danger index (FWI) reached 35, class High.
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.

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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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What really happened?

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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. 67 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 2015, 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