Ridge Fire, August 2026 Los Angeles
The fire started on 7 August 2026 in Los Angeles, United States, and satellites saw it burning for 2 days. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 448 hectares, spread across a single county.
It is the 415th largest in California since 2016 (of 442 with a page). Number 389 in United States in 2026, of 423.
The power measured by the satellite is low (1.7 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
Compare with…
Suggestions: Post · 2024Lake · 2020Route · 2022White · 2024
- Burnt area
- 448ha
- official perimeter (MTBS / NIFC)
- Duration
- ≈ 2days
- 7 Aug 2026 – 8 Aug 2026
- Counties hit
- 1
- counties
- Started on
- 7 Aug
- 2026
- Heat detections
- 6
- in a single hotspot: 2 MW
- Danger at start
- 45
- Very high · FWI index
- Average daily power
- 8MW
- detected power per day, on average
Where it burned
How it evolved, day by day
8 Aug 2026 · 8 MW · 6
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone more than two months without rain (1 mm or more) when it started. Rain came after the fire: 1.0 mm on 11 Aug.
This area had burned before
12% of the perimeter overlaps earlier fires recorded since 2016: 55 ha in 2024.
What happened to each county
-
Los Angeles where it started462 ha reached on 8 Aug0.0 %
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 2025Inside the perimeter there were about 0.15 hectares of built-up land and almost nobody lived there (GHSL 2025, 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. The GHSL 2025 epoch is a projection made from 2020 and earlier data.
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) |
|---|---|---|---|---|---|
| 7 Aug | 34.4 °C | 18 % | 30 km/h | 0.0 mm | Very high 45 |
| 8 Aug | 35.2 °C | 17 % | 29 km/h | 0.0 mm | Very high 43 |
| 9 Aug after | 35.1 °C | 16 % | 33 km/h | 0.0 mm | Very high 46 |
| 10 Aug after | 33.2 °C | 25 % | 36 km/h | 0.1 mm | Very high 41 |
| 11 Aug after | 31.4 °C | 31 % | 32 km/h | 1.0 mm | High 26 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
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 · CopernicusOn 7 August 2026 the air beside the fire reached 26 µg/m³ of PM2.5. That day averaged 17: 1.1 times the WHO daily guideline (15).
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 · 6Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 6,404 haPost Los AngelesJune 2024 · 3 days · 10 km away
- 12,528 haLake Los AngelesAugust 2020 · 19 days · 29 km away
- 2,157 haRoute Los AngelesAugust 2022 · 1 day · 33 km away
- 2,346 haWhite KernJuly 2024 · 8 days · 34 km away
- 4,219 haHughes Los AngelesJanuary 2025 · 2 days · 36 km away
- 2,173 haCanyon Los AngelesAugust 2025 · 2 days · 38 km away
Frequently asked questions
- How long did the Ridge Fire last?
- The official perimeter only gives the start date (7 August 2026). The end comes from the heat detections inside the perimeter: it burned until 8 August 2026 (2 days from 7 August 2026), 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 448 hectares (4.5 km²). Other tallies, such as daily incident reports, may give slightly different figures.
- Which counties burned?
- The fire only entered Los Angeles (462 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 35.2 °C, humidity dropped to 17 % and gusts hit 30 km/h. The fire danger index (FWI) reached 45, class Very 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 ›
- NIFC · National Interagency Fire Center ↗
- InciWeb · Incident Information System ↗
- MTBS · Monitoring Trends in Burn Severity ↗
Satellite cross-check
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.
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
How we know this
- Perimeter: NIFC WFIGS (United States), 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. 6 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 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.
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.