Willow Fire, June 2026 Lake
The fire started on 28 June 2026 in Lake, United States, and satellites saw it burning for 1 day. United States agencies (MTBS / NIFC) mapped an official burnt perimeter of 2,937 hectares, spread across a single county.
It is the 46th largest in Colorado since 2016 (of 167 with a page). Number 139 in United States in 2026, of 423.
- Burnt area
- 2,937ha
- official perimeter (MTBS / NIFC)
- Duration
- 1day
- 28 Jun 2026 – 28 Jun 2026
- Municipalities hit
- 1
- counties
- Started on
- 28 Jun
- 2026
- Heat detections
- 237
- in a single hotspot: 326 MW
- Danger at start
- 28
- High · FWI index
- Energy released
- 351MW
- sum of detected power
Where it burned
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
It had gone 2 days without rain (1 mm or more) when it started. Rain came after the fire: 1.0 mm on 8 Jul.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
Lake where it started3,120 ha reached on 29 Jun3.1 %
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) |
|---|---|---|---|---|---|
| 28 Jun | 20.0 °C | 17 % | 71 km/h | 0.0 mm | High 28 |
| 29 Jun after | 16.0 °C | 21 % | 84 km/h | 0.0 mm | High 30 |
| 30 Jun after | 17.7 °C | 23 % | 68 km/h | 0.6 mm | High 24 |
| 1 Jul after | 18.5 °C | 15 % | 54 km/h | 0.0 mm | High 26 |
| 2 Jul after | 18.5 °C | 16 % | 50 km/h | 0.0 mm | High 26 |
| 3 Jul after | 18.7 °C | 18 % | 48 km/h | 0.5 mm | High 27 |
| 4 Jul after | 19.7 °C | 19 % | 41 km/h | 0.6 mm | High 25 |
| 5 Jul after | 21.6 °C | 18 % | 30 km/h | 0.0 mm | High 23 |
| 6 Jul after | 22.3 °C | 17 % | 34 km/h | 0.0 mm | High 25 |
| 7 Jul after | 20.8 °C | 30 % | 39 km/h | 0.1 mm | High 26 |
| 8 Jul after | 21.9 °C | 27 % | 46 km/h | 1.0 mm | Moderate 19 |
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 30 June 2026 the air beside the fire reached 115 µg/m³ of PM2.5. That day averaged 56: 3.8 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 · 237Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Willow fire last?
- It burned between 28 June 2026 and 28 June 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 2,937 hectares (29.4 km²). Other tallies, such as daily incident reports, may give slightly different figures.
- Which counties burned?
- The fire only entered Lake (3,120 ha, 3.1 %).
- What was the weather like?
- During the fire the temperature reached 21.6 °C, humidity dropped to 15 % and gusts hit 84 km/h. The fire danger index (FWI) reached 30, 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
- NIFC · National Interagency Fire Center ↗
- InciWeb · Incident Information System ↗
- MTBS · Monitoring Trends in Burn Severity ↗
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.
Report an error
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.