After a snowfall blanketed a Dutch village, one house stood out—its roof remained oddly free of snow. At first, neighbors assumed it was due to
renovations or a special roof. But in the Netherlands, a snow-free roof in winter can signal something else entirely: an illegal indoor cannabis farm.
Suspicious, villagers alerted the police. Officers, well aware of the pattern, investigated and quickly discovered a large-scale
cannabis operation inside the home. Powerful grow lights, heaters, and ventilation systems used for cultivating
marijuana produce enough heat to melt roof snow, even in freezing weather. That heat gave the operation away.
This wasn’t an isolated case. Similar busts have occurred in places like Haarlem, Zutphen, and Arnhem,
where police used snow patterns to uncover cannabis farms with hundreds of plants—some worth tens of thousands of euros.
Following these incidents, Dutch police urged the public to report snow-free rooftops in winter. Despite the Netherlands’
reputation for relaxed cannabis laws, growing more than five plants is illegal and considered drug trafficking. As one officer noted, “Sometimes, the snow
tells you more than the neighbors.” The message is clear: even in a tolerant country, large-scale cultivation has serious legal consequences.