Record numbers of rats are seeking shelter indoors across Denmark this winter as mild weather and heavy snowfall drive them from the sewers. Several municipalities are reporting the highest rat infestation levels in years.
Thousands of Reports in Odense Alone
Odense Municipality faced an overwhelming surge in rat sightings in 2025, with 7,823 official reports over the year. That equals about 21 complaints per day. Local authorities confirm that it is a record-high number, continuing a four-year upward trend in many Danish cities.
The city’s dense housing structure and mild winter conditions have created what experts describe as an ideal breeding environment for the rodents. Because of that, rat control teams in Odense have been working around the clock to keep infestations from spreading to homes and businesses.
Widespread Increase Across the Capital Region
The pattern is repeated elsewhere. A new survey among 34 municipalities in the Copenhagen region shows that 15 have seen more rat reports than last year. Solrød Municipality broke its previous record with 1,215 complaints in 2025, surpassing its 2020 level of 1,055.
In Gentofte, complaints jumped by 917 cases from the year before, bringing the total to 4,785. Copenhagen itself has seen rising figures for four consecutive years. Through November, its municipal services received 8,416 rat reports, 658 more than in 2024.
Interestingly, a few areas are seeing improvement. Aalborg, once heavily plagued by rodents, reported a slight decline in infestations. The northern city logged 7,277 cases last year, down from 7,901 the year before. Officials believe coordinated cleanup and infrastructure repairs may be paying off.
Mild Winters and Food Waste Fuel the Boom
Experts point to a mix of environmental and human causes. Denmark’s recent mild winters allow rats to reproduce longer into the season. Heavy rainfall also flushes them out of sewers, forcing them to the surface. In closely built cities, this leads the animals to explore basements, garages, and homes.
Homeowners are being urged to safeguard their properties. Rats need warmth and food to survive, and poorly stored garbage, compost, or bird seed can easily attract them. People living in smaller or dense residential areas such as compact living spaces may be especially vulnerable since rats can more easily spread from one unit to another.
Specialists recommend sealing cracks and ensuring no leftover food or fallen fruit is left around the property. Simple measures such as cleaning around trash bins and checking basements for entry holes can drastically reduce risk.
Cold Conditions Now Pushing Rats Inside
Even though the fall was mild, recent cold spells have reversed the situation, driving the animals to seek warmth indoors. When temperatures drop, rats either dig into the ground or move into buildings. Once inside, they often stay hidden, reproducing rapidly in warm corners.
Municipal pest experts warn that the “rat season” may shift due to climate changes, forcing local governments to adapt their year-round prevention measures. They advise against leaving pet food, stored fruit, or recyclables in unsealed sheds during freezing weather.
With rodents moving closer to people’s living areas, property owners should also verify that their home insurance covers potential pest-related damages. Guidance on policies for foreigners can be found here: home insurance in Denmark.
Authorities Call for Sustained Prevention
For now, municipal pest control teams are under pressure to respond faster and strengthen public information campaigns. Some towns have expanded their exterminator programs and invested in smarter traps. City workers remind residents to report any new sightings quickly so local services can locate and block potential access routes.
Without a doubt, Denmark’s changing climate and urban density are giving rats the upper hand. Whether this winter’s record will be surpassed again next year depends on both the weather and how effectively cities and residents cooperate to make their homes less appealing to unwanted visitors.
Sources and References
The Danish Dream: Compact Living Spaces Increasingly Popular in Denmark
The Danish Dream: Home Insurance in Denmark for Foreigners
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