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Silver Fire, August 2026 Boundary

Out · last detection 24 Aug 2026, 09:13 UTC

The fire started on 23 August 2026 in Boundary, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 1,050 hectares, spread across a single county.

It is the 214th largest in Idaho since 2016 (of 379 with a page). Number 256 in United States in 2026, of 423.

Burnt area
1,050ha
official perimeter (MTBS / NIFC)
Duration
1day
23 Aug 2026 – 23 Aug 2026
Municipalities hit
1
counties
Started on
23 Aug
2026
Heat detections
318
in a single hotspot: 134 MW
Danger at start
22
High · FWI index
Energy released
19MW
sum of detected power

Where it burned

24 Aug 2026
HOTSPOTS BY DAY 23 Aug23 Aug

How it evolved, day by day

2324

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

The weather it burned in

20°high
67km/h · peak gust
31%lowest humidity

It had gone 10 days without rain (1 mm or more) when it started. Rain came after the fire: 4.1 mm on 2 Sept.

This area had burned before

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

What happened to each town

  1. Boundary where it started
    1,045 ha reached on 23 Aug
    0.3 %

Burnt area inside each county, from crossing the official perimeter with administrative boundaries. The distance is from the town centre to the nearest fire: staying a kilometre away does not mean it reached the houses.

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)
23 Aug 20.0 °C 31 % 67 km/h 1.1 mm High 22
24 Aug after 23.6 °C 29 % 32 km/h 0.0 mm Moderate 21
25 Aug after 27.8 °C 18 % 19 km/h 0.0 mm High 30
26 Aug after 29.1 °C 20 % 43 km/h 0.0 mm High 37
27 Aug after 24.5 °C 22 % 62 km/h 0.0 mm Very high 42
28 Aug after 19.9 °C 27 % 46 km/h 0.0 mm High 33
29 Aug after 16.2 °C 36 % 74 km/h 0.1 mm High 31
30 Aug after 14.2 °C 44 % 61 km/h 0.1 mm High 23
31 Aug after 21.4 °C 30 % 34 km/h 0.0 mm High 22
1 Sept after 25.5 °C 16 % 58 km/h 0.1 mm Very high 42
2 Sept after 14.1 °C 65 % 44 km/h 4.1 mm Very low 2

Before and after, from space

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

Before · 16 Aug 2026
After · 30 Aug 2026

If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.

The smoke

CAMS · Copernicus

On 28 August 2026 the air beside the fire reached 170 µg/m³ of PM2.5. That day averaged 69: 4.6 times the WHO daily guideline (15).

PM2.5 peak170 µg/m³
Days over the guideline11 days
PM10175 µg/m³
Optical depth0.82
21222324252627282930311
Good Fair Moderate Poor Very poor Extremely poor

Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.

Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)

Detections table · 318Every 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 Silver fire last?
It burned between 23 August 2026 and 23 August 2026: 1 day, according to the start date recorded by United States agencies (MTBS / NIFC) and the heat detections seen by satellite.
How much area did it burn?
The official perimeter published by United States agencies (MTBS / NIFC) is 1,050 hectares (10.5 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?
The fire only entered Boundary (1,045 ha, 0.3 %).
What was the weather like?
During the fire the temperature reached 20.0 °C, humidity dropped to 31 % and gusts hit 67 km/h. The fire danger index (FWI) reached 22, 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

Satellite cross-check

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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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.

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.