How long did the Mill Creek 1 Fire last?

The official perimeter only gives the start date (16 August 2018). The end comes from the heat detections inside the perimeter: it burned until 26 August 2018 (11 days from 16 August 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 1,616 hectares (16.2 km²). Other tallies, such as daily incident reports, may give slightly different figures.

Which counties burned?

The fire only entered Humboldt (1,621 ha, 0.2 %).

What was the weather like?

During the fire the temperature reached 26.3 °C, humidity dropped to 26 % and gusts hit 38 km/h. The fire danger index (FWI) reached 29, 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 · 2018-08-16 → 2018-08-26

Mill Creek 1 Fire, August 2018 Humboldt

Out · last detection 26 Aug 2018, 09:55 UTC

The fire started on 16 August 2018 in Humboldt, United States, and satellites saw it burning for 11 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 1,616 hectares, spread across a single county.

It is the 231th largest in California since 2016 (of 442 with a page). Number 237 in United States in 2018, of 511.

Compare with…

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Burnt area: 1,616ha; official perimeter (MTBS / NIFC)
Duration: ≈ 11days; 16 Aug 2018 – 26 Aug 2018
Counties hit: 1; counties
Started on: 16 Aug; 2018
Heat detections: 226; in a single hotspot: 104 MW
Danger at start: 22; High · FWI index
Average daily power: 108MW; detected power per day, on average

HOTSPOTS BY DAY 16 Aug26 Aug

Play back 26 Aug 2018

How it evolved, day by day

16 Aug 17 Aug 18 Aug 20 Aug 22 Aug 24 Aug 26 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

26°high

38km/h · peak gust

26%lowest humidity

It had gone more than two months 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 1% of the area of London (16 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

Humboldt where it started

1,621 ha reached on 16 Aug

0.2 %

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	Danger (FWI)
16 Aug	23.0 °C	40 %	32 km/h	High 22
17 Aug	26.2 °C	31 %	34 km/h	High 26
18 Aug	26.3 °C	26 %	31 km/h	High 28
19 Aug	24.0 °C	32 %	36 km/h	High 29
20 Aug	24.5 °C	28 %	31 km/h	High 28
21 Aug	23.8 °C	32 %	30 km/h	High 28
22 Aug	21.9 °C	41 %	30 km/h	High 25
23 Aug	21.4 °C	37 %	33 km/h	High 26
24 Aug	20.4 °C	42 %	38 km/h	High 25
25 Aug	22.4 °C	36 %	32 km/h	High 24
26 Aug	21.4 °C	36 %	37 km/h	High 24
27 Aug after	21.2 °C	45 %	35 km/h	High 23
28 Aug after	22.9 °C	35 %	32 km/h	High 23
29 Aug after	20.3 °C	50 %	31 km/h	Moderate 21
30 Aug after	19.7 °C	46 %	37 km/h	High 22
31 Aug after	18.7 °C	44 %	37 km/h	High 22
1 Sept after	22.4 °C	32 %	36 km/h	High 24
2 Sept after	26.3 °C	23 %	29 km/h	High 28
3 Sept after	26.4 °C	22 %	32 km/h	High 31
4 Sept after	25.6 °C	29 %	31 km/h	High 30
5 Sept after	24.1 °C	33 %	30 km/h	High 29

Before and after, from space

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

↔

Before · 9 Aug 2018

After · 2 Sept 2018

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 · 226Every 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 Mill Creek 1 Fire last?: The official perimeter only gives the start date (16 August 2018). The end comes from the heat detections inside the perimeter: it burned until 26 August 2018 (11 days from 16 August 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 1,616 hectares (16.2 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?: The fire only entered Humboldt (1,621 ha, 0.2 %).
What was the weather like?: During the fire the temperature reached 26.3 °C, humidity dropped to 26 % and gusts hit 38 km/h. The fire danger index (FWI) reached 29, 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. 226 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