Troitske fire, 31 August 2025 Троїцький район · Troitske, Kupiansk
The fire started on 31 August 2025 in Troitske, Ukraine, and satellites saw it burning for 5 days. Copernicus mapped a burnt perimeter of 533 hectares from satellite imagery, spread across 2 municipalities.
It is the 156th largest in Luhansk Oblast since 2016 (of 909 with a page). Number 158 in Ukraine in 2025, of 1359.
The power measured by the satellite is low (15.0 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…
- Burnt area
- 533ha
- Copernicus perimeter
- Duration
- 5days
- 31 Aug 2025 – 4 Sept 2025
- Municipalities hit
- 2
- districts
- Started on
- 31 Aug
- 2025
- Heat detections
- 31
- in a single hotspot: 15 MW
- Danger at start
- 31
- High · FWI index
- Average daily power
- 74MW
- detected power per day, on average
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 5 days without rain (1 mm or more) when it started. Rain came after the fire: 1.3 mm on 8 Sept.
This area had burned before
25% of the perimeter overlaps earlier fires recorded since 2016: 87 ha in 2023, 45 ha in 2024.
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Kyiv boundary: geoBoundaries · OpenStreetMap, Wambacher · © OpenStreetMap contributors (ODbL 1.0).
Paris boundary: geoBoundaries · Institut national de l'information géographique et forestière (IGN-F) (Etalab Open License 2.0).
Madrid boundary: geoBoundaries · Open Data ESRI, IGN Central Registry of Cartography Area (CC BY 4.0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
532 ha reached on 31 Aug0.3 %
-
1 ha0.0 %
Burnt area inside each municipality, 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.
What burned
- Other natural land52 %
- Agricultural areas38 %
- Mixed forest9.3 %
Land cover inside the perimeter as reported by Copernicus EFFIS (outside the Corine Land Cover area).
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) |
|---|---|---|---|---|---|
| 31 Aug | 32.7 °C | 19 % | 35 km/h | 0.0 mm | High 31 |
| 1 Sept | 33.9 °C | 26 % | 25 km/h | 0.0 mm | High 28 |
| 2 Sept | 27.7 °C | 42 % | 32 km/h | 0.7 mm | Moderate 20 |
| 3 Sept | 23.7 °C | 45 % | 33 km/h | 0.0 mm | Moderate 19 |
| 4 Sept | 20.4 °C | 47 % | 29 km/h | 0.0 mm | Moderate 17 |
| 5 Sept after | 20.7 °C | 47 % | 32 km/h | 0.0 mm | Moderate 18 |
| 6 Sept after | 24.1 °C | 35 % | 33 km/h | 0.0 mm | Moderate 21 |
| 7 Sept after | 25.5 °C | 39 % | 41 km/h | 0.0 mm | High 23 |
| 8 Sept after | 25.6 °C | 41 % | 36 km/h | 1.3 mm | Moderate 14 |
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 2 September 2025 the air beside the fire reached 19 µg/m³ of PM2.5, but no daily average passed the WHO 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 · 31Every 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 Troitske fire last?
- Copernicus dates it between 31 August 2025 and 4 September 2025: 5 days between the first and last image with fire.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 533 hectares (5.3 km²). Official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Troitske (532 ha, 0.3 %); Kupiansk (1 ha, 0.0 %).
- Did the fire reach a town?
- The fire started in Troitske and came within 27.4 km of its centre. That is the distance from the perimeter, or the nearest hotspot, to the point marking the centre; it does not mean it entered the houses.
- What was the weather like?
- During the fire the temperature reached 33.9 °C, humidity dropped to 19 % and gusts hit 35 km/h. The fire danger index (FWI) reached 31, class High.
- Where does this data come from?
- From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Ukraine (geoBoundaries). 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: 101 · 112 · 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.
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: EFFIS (Copernicus), mapped on satellite imagery; 2 polygons grouped in this page.
- Dates from the perimeter: the VIIRS detections inside it did not change them. 31 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.
Where this data comes from
The perimeter and land cover come from the Copernicus European Forest Fire Information System (EFFIS), measured on MODIS and Sentinel-2 imagery and published under CC BY 4.0. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM2 (Public Domain). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from each country’s official figure.