Spain's Pyrenees Fire Risk: 300,000 Hectares Under Threat 2026

Spain's Pyrenees could soon face a wildfire of up to 300,000 hectares, according to warnings from forest engineering experts. The prediction comes as the region reels from the 20,000-hectare Peña de Riscos fire, which has already shown how vulnerable these mountains have become.

For years, scientists have pointed to a hidden factor that determines whether a forest burns: the vapor pressure deficit (VPD). Now, their warnings are being taken seriously.

What Is VPD and Why Does It Matter for Wildfires?

VPD measures the atmosphere's "thirst"—the difference between how much moisture the air could hold at a given temperature and how much it actually contains. When VPD is high, the air is dry and pulls moisture from vegetation, turning trees and brush into tinder.

In 2021, Víctor Resco de Dios, a professor of forest engineering at the University of Lleida, and his team published a detailed study in Science of the Total Environment. They measured fuel moisture across numerous pine forest plots at different elevations and compared it with historical burned areas from 2006 to 2020.

Their finding was clear: VPD plays a key role in whether a forest ignites. High VPD means drier fuels, which can lead to more intense and faster-spreading fires.

Why the Pyrenees Are Becoming More Flammable

Historically, the Pyrenees have been less fire-prone than other Mediterranean regions. But that is changing. As temperatures rise and droughts become more frequent, VPD is increasing, even in mountain areas.

The study's authors estimated dates and drew maps showing the loss of the "safety cushion" that once protected these forests. Their work predicted that the Pyrenees would increasingly experience conditions conducive to large fires.

Now, with the Peña de Riscos fire fresh in memory, those predictions look prescient. The fire burned 20,000 hectares—a fraction of the 300,000-hectare worst-case scenario, but a stark warning.

Key Takeaways from the Research

• VPD is a critical driver of wildfire risk, often overlooked in favor of temperature and wind.
• Fuel moisture is directly linked to VPD; drier air means drier vegetation.
• The Pyrenees are losing their natural fire buffer as the climate warms.
• Historical fire data from 2006-2020 shows a clear trend of increasing fire potential.
• Urgent action is needed to manage forests and reduce fuel loads.

How VPD Compares to Other Fire Risk Factors

While temperature and wind are commonly cited, VPD integrates both temperature and humidity into a single metric that better predicts fire danger. As VPD rises, the window for safe fire management shrinks.

What This Means for the Future of the Pyrenees

The 300,000-hectare figure is not a prediction of a single fire, but a warning of the scale that could occur if conditions align. Such a fire would be unprecedented in the region and would overwhelm firefighting resources. The background to this story is set out in Pyrenees Glaciers Face Collapse as Aneto Ice Shrinks Rapidly. A related thread runs through Mallorca's 4,000 Ancient Caves Face Tourism Threat.

Resco de Dios and his colleagues argue that forest management must adapt. This includes reducing fuel loads through controlled burns and mechanical thinning, and creating landscape-level fuel breaks. Earlier coverage in AI Risk Is Not Extinction: 300 French Supermarkets Hacked shows how the argument developed. A closer look at the same subject appears in Procrastination: The Biggest Threat to Academic Performance.

They also emphasize the need for early warning systems based on VPD forecasts, so that resources can be pre-positioned when critical thresholds are exceeded. Anyone following the wider picture can start with Morillo de Tou: The Sunken Pyrenees Village Now a Budget Vacation Paradise. The same theme surfaces in Pyrenees-Orientales Rejects Name Change to Catalan Pyrenees, which takes a different angle.

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