Facing 44°C Heatwaves, Bilbao Deploys 131 Climate Shelters: An Urban Resilience Model for 96% of its Population
# Facing 44°C Heatwaves, Bilbao Deploys 131 Climate Shelters: An Urban Resilience Model for 96% of its Population
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In August 2023, the city of Bilbao, the economic capital of the Spanish Basque Country, experienced a heatwave of unprecedented intensity, with temperatures reaching a record 44.0°C. This event, once considered an anomaly for northern Spain, has become a symptom of an accelerating climate crisis that is forcing urban areas to radically rethink their design. In direct response to this threat, the municipality of Bilbao has implemented a concrete and ambitious adaptation strategy: a network of 131 climate shelters, designed to offer an accessible refuge to almost all of its inhabitants. This system now covers 96% of the population, placing Bilbao at the forefront of European cities seeking pragmatic solutions to protect their citizens from the most severe impacts of global warming.
Bilbao's initiative is not just an emergency measure; it represents an integrated model of preventive urban planning. By combining existing infrastructure with new green spaces, the city has created a dense territorial network that guarantees rapid and equitable access to cool areas. This article provides an in-depth analysis of how this network operates, assesses its relevance in the face of growing health risks, and compares it to the strategies adopted by other European metropolises such as Paris, Vienna, and Athens, in order to identify the key factors for successful urban adaptation to heatwaves.
A Territorial Network Covering 96% of Inhabitants Within a 5-Minute Walk
The cornerstone of Bilbao's strategy is accessibility. The program, officially part of the "Heat Plan for the Prevention of the Health Effects of High Temperatures in Euskadi," was designed to ensure that no resident is left behind. Official data from the municipality confirms that 96% of the city's 348,089 inhabitants are within 300 meters of a climate shelter, which is about a five-minute walk. Even more remarkably, 43% of the population has one of these refuges within 100 meters of their home 1. This hyper-proximity is essential to ensure the effectiveness of the system, especially for the most vulnerable populations: the elderly, young children, pregnant women, and people with chronic illnesses, for whom even short exposure to extreme temperatures can have serious consequences.
The network consists of two complementary types of spaces:
1. 65 indoor shelters: These shelters are located in existing public and private buildings. The list includes municipal libraries, civic centers, sports facilities, transport stations (metro, train stations), museums, exhibition halls, and even shopping centers. To qualify as a shelter, a space must maintain a controlled temperature of around 26-27°C, guarantee free and universal access, and be clearly identified with visible signage.
2. 66 outdoor shelters: These are carefully selected green spaces known for their ability to create natural cool islands. Parks, public gardens, and tree-lined squares offer protection thanks to the shade of their canopy and the phenomenon of plant evapotranspiration, which significantly reduces the ambient temperature. The presence of fountains and water points is also a selection criterion.
To ensure that the information reaches all citizens, the municipality has launched a proactive communication campaign. Field teams, called "Sombralagun" (a Basque portmanteau meaning "friend of the shade"), travel through the neighborhoods to inform residents, distribute maps of the network, and explain how the shelters work. This human and direct approach aims to ensure that the system is not only available but also fully used by those who need it most.
A scientific study published in 2026 in the journal npj Urban Sustainability analyzed the planning methodology of this network. The researchers emphasize that this initiative goes far beyond a simple emergency response. It helps to "solidify Bilbao's reputation as an innovative and adaptive city that proactively addresses the growing challenges of climate change" 2. The study highlights the importance of a data-driven approach to optimize the location of shelters based on population density, neighborhood vulnerability, and the characteristics of the urban fabric. The AccessiCity model, developed as part of this research, even proposes extending the network by including places of worship, schools, and metro entrances to fill coverage gaps.
Urban Adaptation in the Face of Rising Heat-Related Mortality
The implementation of this network is not just a matter of comfort, but a public health imperative. Heatwaves are silent killers. Exposure to extreme temperatures can lead to severe dehydration, heatstroke, cardiovascular and respiratory problems, and, in the most critical cases, death. The population of Bilbao, with an average age of 45.7, is particularly exposed to health risks, a vulnerability exacerbated by the broader climate context of the Basque Country. The region faces a multiplication of risks: 81% of its municipalities are threatened by river floods, 23% by rising sea levels on the coast, and the entire territory is subject to increasingly frequent episodes of drought.
Faced with this reality, European cities are beginning to integrate climate adaptation into the heart of their public policies. The Bilbao model, although very comprehensive, is part of a broader trend where metropolises are experimenting with various solutions.
In Paris, the "Oasis Schoolyards" program, launched in 2017, has transformed 165 asphalt schoolyards into genuine green cool islands. These spaces are open to the public during the summer holidays, offering welcome refuge areas in neighborhoods that are often dense and have few green spaces. The French capital also made a mark by making it possible to swim in the Seine again, a strong symbol of the reconquest of urban waterways as a cooling tool 3.
In Vienna, innovation is found in the details of everyday life. The city has begun to install bus shelters with green roofs. Although modest in appearance, this measure helps to reduce the perceived temperature at public transport stops, places where users are often forced to wait in the sun.
Hamburg, Germany, has adopted a large-scale approach with its "green roof strategy" initiated in 2014. The city subsidizes between 30% and 60% of the costs for owners who voluntarily green their roofs and aims to make this practice mandatory for all new suitable buildings. The goal was to reach 100 hectares of green roofs in a decade, contributing to both building insulation and the reduction of the urban heat island effect.
Complementary Strategies for a Replicable and Holistic Model
The success of the model in Bilbao and other pioneering cities is based on the understanding that climate shelters are only one piece of a much larger puzzle. An effective adaptation strategy must be holistic and combine short, medium, and long-term interventions.
The city of Getafe, in the working-class suburbs of Madrid, illustrates this complementary approach well. Through its "Hogares Saludables" (Healthy Homes) program, the municipality is tackling the problem at its source: the overheating of buildings. The program finances the improvement of thermal insulation, the installation of solar shading, and the development of small green infrastructures (green balconies, etc.), targeting primarily housing in low-income neighborhoods, where residents are often the most vulnerable and least able to finance such work.
The nature of urban materials is another essential lever. The small town of Rethymno, in Crete, has shown that it is possible to cool public spaces by replacing asphalt with more suitable materials. The use of permeable compressed soils, pavements painted with reflective coatings (cool pavements), and light-colored paints on buildings can significantly reduce the absorption of solar heat and lower the surface temperature by several degrees.
These examples converge on a clear conclusion: the replicability of the Bilbao model in Europe is not about copying and pasting a list of measures, but about drawing inspiration from its methodology. Success depends on each city's ability to analyze its own vulnerabilities (demographic, urban, climatic) and build a portfolio of tailor-made solutions. The npj Urban Sustainability study on Bilbao confirms this: the effectiveness of a shelter network depends on a detailed analysis of "spatial accessibility, opening hours, and building typology" 2. A museum, for example, does not offer the same flexibility in opening hours as a metro station. Cities like Toronto, Seoul, and Melbourne are going further by activating exceptional opening hours for their shelters during heatwave alerts, a protocol that Bilbao could also adopt to strengthen its system.
The study goes even further by testing the replicability of the refined "Bilbao Strategy." By extrapolating it to 131 cities across different continents, climate zones, and colonial legacies, the researchers found that the strategy achieves more than 60% of the maximum potential coverage in 74.81% of cases and exceeds 40% in 96.18% of cases. These results highlight the importance of urban density, climatic context, and typological availability in the strategy's performance, offering an adaptable model for improving resilience on a global scale.
In conclusion, Bilbao's strategy provides a valuable roadmap. It demonstrates that rapid, data-informed, and socially equitable action is possible. By offering almost universal protection to its citizens, Bilbao is not just managing a crisis; it is redefining what it means to be a resilient city in the 21st century. Its model, enriched by the innovations of other European cities, proves that climate adaptation is not just a technical constraint, but an opportunity to create fairer, healthier, and more livable cities for all.
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References
[1] Bilbao pone en marcha de nuevo este verano 131 refugios climáticos. (2025, June 18). Bi-Aste. Retrieved March 24, 2026, from https://www.bi-aste.com/articulo/actualidad/bilbao-pone-marcha-nuevo-verano-131-refugios-climaticos/20250618154609005219.html
[2] Divasson-J, A., Macarulla, A. M., Garcia, J. I., & Borges, C. E. (2026). Seeking protection in times of turbulence: A methodology to assess and optimise the location of indoor climate shelters. npj Urban Sustainability, 6(1). https://www.nature.com/articles/s42949-026-00356-7
[3] European cities step up as record heatwaves highlight urgent need for climate adaptation. (2025, July 22). Energy Cities. Retrieved March 24, 2026, from https://energy-cities.eu/european-cities-step-up-as-record-heatwaves-highlight-urgent-need-for-climate-adaptation/
