How long did the Wolf fire last?

It burned between 29 June 2025 and 29 June 2025: 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 966 hectares (9.7 km²). Other tallies, such as daily incident reports, may give slightly different figures.

Which counties burned?

The fire only entered Riverside (966 ha, 0.0 %).

What was the weather like?

During the fire the temperature reached 32.1 °C, humidity dropped to 20 % and gusts hit 46 km/h. The fire danger index (FWI) reached 44, 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.

US · United States · 2025-06-29 → 2025-06-29

Wolf Fire, 29 June 2025 Riverside

Out · last detection 30 Jun 2025, 20:02 UTC

The fire started on 29 June 2025 in Riverside, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 966 hectares, spread across a single county.

It is the 292th largest in California since 2016 (of 442 with a page). Number 216 in United States in 2025, of 327.

The power measured by the satellite is low (19.6 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.

Burnt area: 966ha; official perimeter (MTBS / NIFC)
Duration: 1day; 29 Jun 2025 – 29 Jun 2025
Municipalities hit: 1; counties
Started on: 29 Jun; 2025
Heat detections: 22; in a single hotspot: 20 MW
Danger at start: 43; Very high · FWI index
Energy released: 180MW; sum of detected power

HOTSPOTS BY DAY 29 Jun29 Jun

How it evolved, day by day

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

46km/h · peak gust

20%lowest humidity

It had gone 25 days 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.

What happened to each town

Riverside where it started

966 ha reached on 30 Jun

0.0 %

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	Danger (FWI)
29 Jun	32.0 °C	20 %	46 km/h	Very high 43
30 Jun after	32.1 °C	20 %	45 km/h	Very high 44
1 Jul after	31.5 °C	16 %	38 km/h	Very high 43
2 Jul after	30.1 °C	22 %	44 km/h	Very high 44
3 Jul after	30.3 °C	20 %	48 km/h	Very high 45
4 Jul after	30.2 °C	20 %	45 km/h	Very high 44
5 Jul after	30.8 °C	12 %	44 km/h	Very high 46
6 Jul after	32.2 °C	14 %	44 km/h	Very high 47
7 Jul after	32.4 °C	13 %	44 km/h	Very high 47
8 Jul after	33.1 °C	16 %	40 km/h	Very high 46
9 Jul after	35.2 °C	15 %	45 km/h	Very high 48
10 Jul after	34.7 °C	14 %	47 km/h	Very high 49

Before and after, from space

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

↔

Before · 22 Jun 2025

After · 6 Jul 2025

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.

The smoke

CAMS · Copernicus

On 1 July 2025 the air beside the fire reached 28 µg/m³ of PM2.5. That day averaged 17: 1.1 times the WHO daily guideline (15).

PM2.5 peak28 µg/m³

Days over the guideline3 days

PM1030 µg/m³

Optical depth0.22

WHO 15

2728293012

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 · 22Every 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

All fires in United States ›

Frequently asked questions

How long did the Wolf fire last?: It burned between 29 June 2025 and 29 June 2025: 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 966 hectares (9.7 km²). Other tallies, such as daily incident reports, may give slightly different figures.
Which counties burned?: The fire only entered Riverside (966 ha, 0.0 %).
What was the weather like?: During the fire the temperature reached 32.1 °C, humidity dropped to 20 % and gusts hit 46 km/h. The fire danger index (FWI) reached 44, 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

Satellite cross-check

NASA FIRMS ↗
NIFC · Fire maps ↗

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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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