Iceland has long been known for its mosquito-free reputation. The country’s chilly temperatures and unpredictable winters made it tough for these pests to survive. But that might be changing. Recently, scientists identified three mosquitoes, specifically the species Culiseta annulata, on the island. This surprising discovery was considered unlikely until now.
The finding began when Björn Hjaltason, an insect enthusiast, spotted what he called a “strange fly” while using wine to attract moths. He quickly collected the insect, later confirmed as a female mosquito. Soon after, two more were found, marking the first documented presence of mosquitoes in Iceland’s wild.
Historically, mosquitoes had reached Iceland in small numbers via airplanes, but they never established populations outdoors. This time, the discovery was different because it involved mosquitoes found in nature, not just hitching a ride on a plane.
There are reasons why Iceland stayed mosquito-free for so long. Cold weather alone isn’t the issue. When temperatures drop below 50°F (10°C), mosquitoes struggle to feed and reproduce. Some species, like Aedes nigripes, have adapted to Arctic conditions by hibernating under ice. Iceland’s rapid temperature changes, however, disrupt mosquito life cycles, preventing them from settling. Culiseta annulata may thrive better here since it can take refuge in human-made structures during cold spells, allowing it to survive until warmth returns.
Interestingly, Iceland’s warming climate opens new doors for these pests. In 2025, temperatures soared, with Egilsstaðir Airport hitting about 79.9°F (26.6°C). Similar patterns are happening globally. In the UK, eggs of the Egyptian mosquito and the Asian tiger mosquito have been found, both of which can spread diseases. While Culiseta annulata isn’t known for transmitting major diseases, its presence signals Iceland’s shift toward a landscape that could support mosquitoes. Now, Antarctica is the last holdout for a mosquito-free region.
The arrival of mosquitoes brings mixed feelings. On social media, many Icelanders express surprise and concern. They wonder if this change will affect local ecosystems or their own comfort during summer outings. As climate change continues to reshape environments, impacts like this could become more common.
This shift highlights the broader implications of climate change on our ecosystems. Authorities and experts stress the importance of monitoring these changes. The effects are not just local but global, impacting health, ecology, and even our personal lives. As Iceland navigates this new reality, the world will be watching closely.
