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State Creek Fire, August 2020 Jefferson

Out · last detection 10 Oct 2020, 09:03 UTC

The fire started on 29 August 2020 in Jefferson, United States, and satellites saw it burning for 43 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 1,839 hectares, spread across a single county.

It is the 113th largest in Montana since 2016 (of 302 with a page). Number 191 in United States in 2020, of 441.

Burnt area
1,839ha
official perimeter (MTBS / NIFC)
Duration
≈ 43days
29 Aug 2020 – 10 Oct 2020
Counties hit
1
counties
Started on
29 Aug
2020
Heat detections
361
in a single hotspot: 225 MW
Danger at start
36
High · FWI index
Average daily power
147MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 29 Aug10 Oct
10 Oct 2020

How it evolved, day by day

2 Sept 2020 · 80 MW · 2 3 Sept 2020 · 27 MW · 6 4 Sept 2020 · 7 MW · 2 5 Sept 2020 · 1,938 MW · 28 6 Sept 2020 · 661 MW · 126 7 Sept 2020 · 64 MW · 46 11 Sept 2020 · 25 MW · 4 12 Sept 2020 · 249 MW · 25 13 Sept 2020 · 66 MW · 23 14 Sept 2020 · 30 MW · 10 15 Sept 2020 · 61 MW · 17 16 Sept 2020 · 31 MW · 13 17 Sept 2020 · 45 MW · 17 18 Sept 2020 · 21 MW · 17 19 Sept 2020 · 4 MW · 4 23 Sept 2020 · 1 MW · 1 24 Sept 2020 · 2 MW · 1 3 Oct 2020 · 2 MW · 2 4 Oct 2020 · 3 MW · 1 5 Oct 2020 · 3 MW · 2 8 Oct 2020 · 56 MW · 10 9 Oct 2020 · 4 MW · 3 10 Oct 2020 · 5 MW · 1
5 Sept 15 Sept 23 Sept 8 Oct

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

The weather it burned in

32°high
66km/h · peak gust
8%lowest humidity

It had gone 2 days without rain (1 mm or more) when it started. Rain came after the fire: 4.6 mm on 12 Oct.

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 1.2% of the area of London (18 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. Jefferson where it started
    1,830 ha reached on 2 Sept
    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 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)
29 Aug 26.1 °C 15 % 48 km/h 0.0 mm High 36
30 Aug 18.0 °C 11 % 56 km/h 0.0 mm Very high 39
31 Aug 10.6 °C 37 % 34 km/h 2.7 mm Very low 5
1 Sept 22.7 °C 30 % 56 km/h 0.0 mm Moderate 18
2 Sept 24.7 °C 18 % 63 km/h 0.0 mm High 34
3 Sept 26.1 °C 17 % 46 km/h 0.0 mm High 33
4 Sept 29.3 °C 11 % 22 km/h 0.0 mm High 32
5 Sept 31.6 °C 10 % 62 km/h 0.0 mm Extreme 50
6 Sept 25.9 °C 17 % 40 km/h 0.0 mm Very high 39
7 Sept 14.4 °C 39 % 58 km/h 8.2 mm Very low 2
8 Sept 8.5 °C 27 % 41 km/h 0.0 mm Very low 4
9 Sept 16.5 °C 28 % 24 km/h 0.0 mm Low 9
10 Sept 21.1 °C 23 % 20 km/h 0.0 mm Moderate 15
11 Sept 23.1 °C 16 % 36 km/h 0.0 mm High 25
12 Sept 25.4 °C 11 % 33 km/h 0.0 mm High 30
13 Sept 22.3 °C 18 % 29 km/h 0.0 mm High 28
14 Sept 24.1 °C 17 % 44 km/h 0.0 mm High 34
15 Sept 23.5 °C 14 % 33 km/h 0.0 mm High 32
16 Sept 21.6 °C 17 % 23 km/h 0.0 mm High 31
17 Sept 21.9 °C 22 % 27 km/h 0.0 mm High 30
18 Sept 22.0 °C 15 % 41 km/h 0.0 mm High 31
19 Sept 16.4 °C 30 % 40 km/h 7.2 mm Very low 2
20 Sept 16.1 °C 28 % 52 km/h 0.0 mm Low 9
21 Sept 21.3 °C 17 % 34 km/h 0.0 mm Moderate 18
22 Sept 20.2 °C 23 % 40 km/h 0.2 mm Moderate 21
23 Sept 21.4 °C 18 % 44 km/h 0.0 mm High 27
24 Sept 17.2 °C 27 % 53 km/h 0.0 mm High 28
25 Sept 13.9 °C 29 % 62 km/h 0.2 mm High 28
26 Sept 12.1 °C 20 % 66 km/h 1.8 mm Moderate 12
27 Sept 10.8 °C 26 % 45 km/h 0.0 mm Moderate 16
28 Sept 18.8 °C 23 % 38 km/h 0.0 mm High 21
29 Sept 22.9 °C 13 % 43 km/h 0.0 mm High 30
30 Sept 18.2 °C 26 % 23 km/h 0.0 mm High 23
1 Oct 20.7 °C 12 % 39 km/h 0.0 mm High 31
2 Oct 20.3 °C 22 % 27 km/h 0.0 mm High 27
3 Oct 20.4 °C 21 % 20 km/h 0.0 mm High 25
4 Oct 23.1 °C 14 % 51 km/h 0.0 mm High 36
5 Oct 20.4 °C 18 % 40 km/h 0.0 mm High 33
6 Oct 23.7 °C 16 % 47 km/h 0.0 mm High 36
7 Oct 22.4 °C 17 % 24 km/h 0.0 mm High 29
8 Oct 21.5 °C 9 % 52 km/h 0.0 mm Very high 41
9 Oct 19.7 °C 17 % 37 km/h 0.0 mm High 35
10 Oct 19.6 °C 8 % 64 km/h 2.9 mm Moderate 15
11 Oct after 6.9 °C 37 % 74 km/h 0.0 mm Moderate 18
12 Oct after 11.1 °C 30 % 82 km/h 4.6 mm Low 6

Its twins: fires that started in the same weather

It started with an FWI of 36.0, a minimum humidity of 15% and 2 days without rain. Fires in the area that started in weather like this since 2016: 17.

FWI at the start 36.0
Minimum humidity 15 %
Days without rain 2
this fire chosen twins rest of the area
Almost identicalSimilar

Outlines of the closest twins

Sand Creek Fire, August 2026
14,375 ha 8 days FWI 35.0 Min. humidity 15 % 104 km away, in 2026

First rain (1 mm or more) after it ended: 1.0 mm on 12 Aug.

What happened to them

23 days
median duration
1,700 ha
median area
71 %
went past 1,000 ha
4.2 mm
rain at the end (median; 16 of 17 had it)

It burned an area similar to its twins (1,839 ha against a median of 1,700 ha) and lasted 43 days, against 23 days.

In 1 of 17, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 4.2 mm.

This is a bank of analogues: it shows what usually happens, not what will happen. With fewer than 15 twins we give no figures. How we calculate it

How it ended

4.6 mmfirst rain
12 Oct2 days after it ended
66km/h · max. gust

It was considered over on 10 Oct, and on 12 Oct 4.6 mm fell. We do not know whether the rain or the firefighters put it out. Twins with rain when they ended: 16 of 17, with a median of 4.2 mm.

Weather on this page: Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)

How a twin is chosen

  • Same area: fires that have already ended, less than 250 km from this one, since 2016.
  • Same start: we compare the FWI on the first day, the minimum humidity that day and the run of days without rain before it. The slider sets how much they may differ.
  • Only pages with final weather data (ERA5 reanalysis) calculated in the same way as this fire’s; agricultural and grass burns and pages with data under review are left out.
  • Fires burning at the same time as this one (a week before or after) are left out: they share the same spell of weather and do not count as a precedent.
  • They are sorted by similarity, and the outlines of the first five are drawn.

How we calculate it

Before and after, from space

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

Before · 22 Aug 2020
After · 17 Oct 2020

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 · 361Every 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 State Creek Fire last?
The official perimeter only gives the start date (29 August 2020). The end comes from the heat detections inside the perimeter: it burned until 10 October 2020 (43 days from 29 August 2020), 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 1,839 hectares (18.4 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire only entered Jefferson (1,830 ha, 0.4 %).
What was the weather like?
During the fire the temperature reached 31.6 °C, humidity dropped to 8 % and gusts hit 66 km/h. The fire danger index (FWI) reached 50, 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.
How did the fires that started in similar weather in this area end?
Fires less than 250 km away that started since 2016 with a similar FWI, humidity and dry spell: 17. Their median duration was 23 days and their median area 1,700 ha; 71 % went past 1,000 ha. In 1 of 17, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 4.2 mm.

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.

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.

Report an error
What do you think is wrong?

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: 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. 361 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.