First Confirmed Sightings of Murder Hornets in the US
The first live Asian giant hornet, commonly called a murder hornet, was found in the United States in December 2019 near Blaine, Washington. The Washington State Department of Agriculture confirmed the specimen in a routine trap check and immediately launched a survey in the surrounding area. The hornet, a nonnative species known for preying on honeybees, was linked to earlier detections in British Columbia, Canada, during late 2019, according to the department's official updates on invasive pest tracking.
Before the 2019 discovery, no verified live murder hornet had ever been recorded in the continental US. The Washington State Department of Agriculture worked with the US Department of Agriculture and local beekeepers to set up additional traps and monitoring zones in Whatcom County. The goal was to determine whether the hornet had already established a breeding population or was a single accidental introduction from Asia.
Spread, Nest Findings, and Eradication Efforts
In 2020, researchers found and destroyed the first confirmed murder hornet nest in the US near Blaine, Washington. The nest, located in a tree cavity, contained about 200 hornets, including queens, workers, and larvae, and was removed by a team from the Washington State Department of Agriculture using vacuum extraction and carbon dioxide treatment. Genetic analysis of specimens from the nest helped confirm the origin and supported the conclusion that the hornet had likely arrived via shipping routes from Asia.
Following the nest removal, surveillance continued across northwest Washington State and into neighboring regions. Additional sightings were reported in 2020 and 2021, including a few hornets trapped in areas outside Whatcom County. The Washington State Department of Agriculture expanded its trapping grid and coordinated with beekeeping associations to protect commercial pollinators. The department also published guidance on how to report possible sightings and avoid stings.
Public Alerts and Monitoring Timeline
State agencies issued public alerts in 2020 and 2021, urging residents in affected counties to report large hornet sightings and avoid disturbing suspected nests. The alerts included clear identification tips, such as the hornet's large size, orange-yellow head, and dark thorax, to help distinguish it from native wasps and bees. The department also worked with local media and social platforms to share updates and reduce panic while keeping the public informed.
Eradication Results and Current Status
By late 2021, the Washington State Department of Agriculture declared that no live murder hornets had been detected in the US for multiple consecutive years, signaling a successful eradication effort in the initial outbreak zone. The department continues annual trapping and monitoring in high-risk border areas to detect any new introductions early. The program is considered a model for rapid response to invasive insect threats and has been cited by federal and state agricultural agencies as a best practice.
Why Murder Hornets Matter for US Agriculture and Beekeeping
Murder hornets pose a direct threat to honeybee colonies, which are essential for pollinating crops that support the US agricultural economy. A single hornet can kill dozens of bees in minutes, and a group can destroy an entire hive in hours, according to research shared by university extension programs and beekeeping organizations. The hornet's impact on pollination services highlights the broader economic risk that invasive species pose to food production and farm revenue.
The US Department of Agriculture and state agencies have invested in early detection tools, public education, and rapid response protocols to reduce the chance of a large-scale hornet establishment. These efforts are part of a wider strategy to protect pollinators, which contribute billions of dollars to the US economy each year. Continued monitoring and international cooperation on biosecurity remain key to preventing future introductions of murder hornets and other invasive pests.