Britain's first megafire: how the Dava blaze rewrote the rulebook on UK wildfire risk

Four days that changed everything

Between 28 June and 1 July 2025, two independently-ignited fires on Dava moor and near Carrbridge in the Scottish Highlands merged and tore through the landscape. When the smoke finally cleared, 11,827 hectares of moorland and peatland had burned — roughly twice the size of the next-largest UK fire in the past 20 years.

The International Association of Wildland Fire defines a megafire as one exceeding 10,000 hectares (or 100,000 hectares in parts of the world with larger fires). The Dava fire crossed that threshold, making it the UK's first recorded megafire by any reasonable definition.

Why it burned the way it did

The summer of 2025 was preceded by an exceptionally dry spring across northern Scotland. Soil moisture in the peat was anomalously low — a condition that would normally be considered rare but which researchers now say is becoming more likely under the present climate.

Once the fires merged, spread was rapid. Over 79% of the burned area was classified as high-severity — meaning near-total combustion of above-ground vegetation, and in many places, deep burning of the peat itself.

Peat is the key issue. Unlike grass or heather, which can recover within a few years, peat takes decades to centuries to form. When peat burns, carbon that has accumulated over hundreds or thousands of years is released in hours.

The carbon numbers

A study published in Nature Geoscience in 2026 put the carbon emissions from the fire at 38,600 MgC — with peat combustion accounting for nearly 85% of that total. To put that in context: the total annual fire emissions for the whole UK averaged across 2001–2021 are roughly equivalent to what Dava alone released in four days.

Stanford's Doerr School of Sustainability described it as "nearly a year's worth of UK fire emissions in four days."

What it means for 2026 and beyond

The researchers are clear: the climate conditions that enabled the Dava fire are more likely in the present climate than in a pre-industrial climate, and similar conditions will become more common through the rest of this century.

For the UK, that means megafire risk is no longer a theoretical concern. Scotland saw extreme wildfire warnings across the whole country at the end of April 2026 and into May — conditions driven by the same combination of low soil moisture, low humidity, and dry vegetation that preceded Dava.

The wildfire commission launched by moorland management groups in early 2026 is partly a direct response to the Dava fire, seeking to understand fuel load management, muirburn practices, and emergency response capability.

On the ground

For chasers and weather observers in Scotland: conditions conducive to extreme wildfire spread will increasingly appear on the radar as a chase target in their own right. Pyrocumulus development, rapidly changing wind fields near active burns, and smoke impacts on visibility all become relevant considerations as fire behaviour in the UK scales toward the kind of events previously associated with Australia or the western US.