Winter suitability of climate-adapted design – this may sound like a discipline for specialists with thermometers and grit, but it has long concerned every ambitious urban planner, landscape architect and urban designer. Anyone who wants to make public spaces in Germany, Austria or Switzerland resilient to summer heat must not dismiss winter as an annoying off-season. On the contrary: a truly sustainable, climate-adapted design must also prove its qualities in sub-zero temperatures, frozen floors and slush. What does this mean for planning, choice of materials, vegetation concepts and user expectations? And how can we achieve a paradigm shift away from the summer dream and towards a lively and functional urban landscape all year round?

• Why climate-adapted planning does not end at the first frost – and how winter suitability should be understood as a quality feature.
• Opportunities and challenges in the design of open spaces, materials and vegetation for winter city operation.
• Innovative examples and best practices from DACH cities: What works, where is there a need to catch up?
• Technical and design strategies for sustainable winter maintenance, drainage and accessibility.
• How climate change-related extreme weather conditions (freezing rain, heavy frost, thawing) revolutionize planning logic.
• The role of participation, communication and expectation management in dealing with seasonal changes.
• Legal and economic framework conditions for urban and open space design suitable for winter.
• Why winter is indispensable as a testing ground for the resilience of urban spaces – and what planners can learn from it.

Winter suitability as a touchstone for climate-adapted urban planning

Climate adaptation has long been a fixed keyword in competitions, mission statements and funding programs. In practice, however, there is often a fatal fixation on summer: shade providers, evaporation areas, drinking water fountains and green roofs – all key elements when it comes to heat management. But as soon as the first leaves fall and the temperatures drop, interest wanes. Then gritting plans, snow clearing services and the risk of slipping dominate the discussion. Yet the winter month in particular should serve as a litmus test for the quality of climate-adapted urban design. Anyone planning open spaces, squares or new districts must ask themselves: How do our designs work in slush, frost and darkness? Where is there a problem with accessibility, how do plants, surfaces and furnishings survive the grueling months between November and March?

The term winter suitability encompasses more than just technical operational readiness. It is not just about ensuring that surfaces can be cleared and gritted or that sidewalks do not mutate into ice rinks. Rather, the question is how open, safe and attractive urban spaces actually remain in winter. The quality of drainage concepts, the robustness of vegetation, the visibility of paths and accessibility for all are not luxurious details, but key requirements for climate-adapted planning.

A look at Scandinavia shows how naturally winter is incorporated into the design logic: Seating with wind protection, strategically placed lighting, choice of materials for high freeze/thaw loads and vegetation that is not just bare branches even in January. In Germany, Austria and Switzerland, such winter-proof designs are still too often the exception – and are often seen as an additional cost rather than a building block for long-term resilience.

Climate change is also changing the winter months. The spectrum ranges from mild winters with continuous rain to sudden cold snaps, heavy frost, freezing rain or alternating thaw and frost phases, which become a stress test for urban trees, surface coverings and drainage systems in particular. Planning that ignores winter therefore risks not only functional losses, but also serious follow-up costs due to repairs, breakdowns or wear and tear.

Winter suitability should therefore not be seen as a chore, but as a quality feature of climate-adapted planning. It is the touchstone for determining whether a design works all year round, whether materials, plants and user interests are harmoniously coordinated – and whether the city can actually be experienced by everyone, regardless of the weather and season.

Materiality, vegetation and spatial effect: think year-round, design robustly

The choice of materials and surface design are at the heart of any discussion about winter suitability. What appears to be pleasantly foot-friendly, glare-free and low-maintenance in midsummer can quickly become a source of danger in winter. Freeze/thaw cycles, road salt, moisture and mechanical loads from snow clearing vehicles place the highest demands on paving, slabs, asphalt and joints. Experience shows: Cheap materials or improper laying take their revenge after the first winter at the latest with frost cracks, unevenness or slippery surfaces. High-quality, frost-resistant coverings with a non-slip surface structure are not an optional extra, but a must.

Vegetation must also be able to cope with winter extremes. Trees, shrubs and perennials that can withstand summer heat are not automatically resistant to winter. Urban trees suffer from road salt, soil compaction and changing water levels. Careful species selection, sufficiently large tree grates, permeable substrates and innovative irrigation technologies that work all year round can help here. Evergreen plantings, structurally rich grasses or robust undergrowth not only bring color and structure to the dreary months, but also provide valuable retreats for birds and insects.

Another central theme is the spatial effect in winter. Darkness, wetness, snow and ice fundamentally change the atmosphere of urban spaces. Squares, paths and parks that function as lively meeting places in summer can quickly become deserted and forbidding in winter without well thought-out lighting, wind protection and furniture. Strategically placed islands of light, seating protected from the wind and flexible spatial concepts that invite people to linger even in the cold and dark are essential.

It is important to consider the usage requirements of different groups. Children, the elderly and people with limited mobility are particularly dependent on safe, easily recognizable and accessible paths. Accessibility does not end at the kerb – in winter, it also includes keeping ramps clear, avoiding tripping hazards caused by frozen puddles or uncontrolled grit and providing orientation through high-contrast markings.

Winter-suitable design ultimately means combining robustness with aesthetics. It is about creating spaces that not only function technically, but also create identity in winter, offer quality of stay and enable social interaction. Planners who take this to heart create real added value – and set standards for year-round urban quality.

Technical strategies and maintenance concepts: From drainage to gritting services

The technical requirements for open spaces suitable for winter are high – and are becoming increasingly complex in times of climate change. Drainage is a key issue. Heavy rainfall in winter, followed by frost, can lead to the formation of ice on paths and squares if the water cannot drain away quickly and reliably. Surfaces with sufficient slope, well-dimensioned drainage channels, permeable joints and retention areas are essential. The positioning of drains, the choice of salt-resistant materials and regular inspection of the systems are also part of the mandatory program.

Gritting services and winter maintenance are often seen as purely operational tasks. However, intelligent planning can significantly reduce the effort and risks involved. Wide main paths that can also be used by machines, clear routes, avoidance of bottlenecks and dead ends and consideration of turning options for clearing vehicles make winter maintenance much easier. The selection of plants that tolerate road salt and mechanical stress and the avoidance of trees and shrubs planted too close to the path are also important aspects.

Another technical field is the integration of smart irrigation and drainage systems. Sensor-supported systems can not only optimize the supply of vegetation in summer, but also help to prevent frost damage in winter through timely drainage or targeted management of excess water. Digital monitoring systems, such as those being tested in pilot projects in Zurich and Vienna, provide valuable data for fine-tuning maintenance and operating procedures.

The use of alternative gritting agents, such as lava, sand or grit instead of conventional road salt, can reduce the impact on vegetation and surfaces. However, these agents must be removed regularly to prevent blockages in drains and the formation of fine dust. Innovative approaches, such as heated sidewalks, are still rare and usually only make economic sense at neuralgic points such as entrances or pedestrian zones.

Maintenance concepts must be seasonally flexible and forward-looking. This means: timely pruning before winter, removal of leaves and fallen fruit, checking trees for the risk of breakage and – not forgetting – communication with residents and users. Transparent information about planned measures, temporary restrictions or alternative routes increases acceptance and reduces the risk of accidents.

Best practices, participation and communication challenges

Anyone looking for exemplary projects for climate-adapted winter design will increasingly find them in German-speaking countries. In Vienna, for example, parks such as Helmut-Zilk-Park or the Nordbahnhof forecourt are designed to function as social meeting places even in winter: with wind-protected recreation zones, robust materials, evergreen planting and targeted lighting that creates safety and atmosphere. In Zurich, new urban districts are being developed according to the principle of “four-season suitability”. Winter aspects are incorporated into the design phase right from the start – from the orientation of the paths to the furniture and the maintenance concept.

An important success factor is the early and continuous involvement of users, residents and operating staff. They often know the actual weak points and needs in winter operations better than external planning offices. Participation formats, such as seasonal user workshops, feedback apps or digital twins that simulate different weather scenarios, provide valuable information for optimizing designs and operating processes.

Communication is an underestimated discipline, especially when it comes to winter suitability. Expectations of year-round usability that are too high can lead to disappointment when snow, ice or wet conditions make temporary restrictions unavoidable. This is where realistic information, seasonal usage offers and flexible space concepts that enable temporary adaptations, such as mobile furniture, temporary roofing or changing light installations, can help.

The biggest challenges often lie in financing and the legal framework. Winter-proof materials, innovative technology and flexible maintenance are reflected in higher initial investments, but pay off through lower follow-up costs and higher quality of use. Funding programs and sustainable procurement concepts, such as those being tested in Munich or Basel, can provide important impetus here.

Another problem area is the coordination between planning, construction and operation. If you want winter-proof design, you need to involve all stakeholders at an early stage and clearly define the interfaces between planning, construction and maintenance. This is the only way to create a consistent, robust concept that will stand up to the practical test in February.

Conclusion: Winter as a stage for the city’s resilience

Winter is more than just a break between two summers. It is the stage on which the resilience, quality and sustainability of climate-adapted urban and open space design must prove themselves. Planning that is limited to heat protection and evaporative cooling remains incomplete. Only when spaces, materials, vegetation and utilization concepts can also withstand the stresses of winter will a truly sustainable urban landscape be created that is attractive all year round.

This means that winter suitability is not a by-product, but an integral part of good planning. It requires technical and design intelligence, interdisciplinary cooperation, the courage to innovate and open communication with all those involved. Cities that see winter as a touchstone and source of inspiration create open spaces that are inviting, safe and enable social interaction even in snow, ice and darkness.

Those who invest now in winter-proof, climate-adapted design are not only equipping themselves for the challenges of climate change, but are also setting standards for sustainable urban quality. Winter is not an enemy, but a creative driver for robust, flexible and vibrant urban spaces – and the best opportunity to put your own planning principles through their paces.