Vienna's 137,000 Street Trees — and Where the Shade Runs Out

Vienna has around 137,000 street trees — an average of 3.96 for every 100 metres of street. But that average hides a sharp divide: some districts have up to eight times more than others. On a cool day that's an aesthetic difference. As the city keeps getting hotter, it becomes a question of which streets stay walkable and which turn into heat traps.

A note on the data: this map counts Vienna's street trees from the city's public tree register, along roads and paths. It doesn't capture trees in parks, courtyards, private gardens, or cemeteries, and any register lags slightly behind reality as trees are planted or removed. So read it as a map of the street canopy specifically — not every tree in the city — but as a picture of where the street network offers shade, and where it doesn't, it's a telling one.