Wildlife officials Investigate Deer Deaths in Northwest Montana
KALISPELL, MT - September 20, 2025 – Montana Fish, Wildlife & Parks (FWP) is investigating a recent increase in white-tailed deer mortality in northwest Montana, with suspicion focused on hemorrhagic disease (HD). Reports of sick and dead deer have surfaced primarily in the marion area,prompting a response from wildlife managers.
The outbreak,if confirmed,poses a potential threat to local deer populations and could impact hunting opportunities.Hemorrhagic disease is a viral infection transmitted by biting midges, and while it doesn’t pose a risk to humans or domestic animals, it can be fatal to deer.FWP is currently collecting samples for laboratory testing to confirm the presence of the virus and determine the extent of the outbreak.
FWP began receiving reports of deer exhibiting symptoms consistent with HD, including weakness, loss of appetite, and hemorrhaging from the nose and ears. The agency is urging the public to report any sightings of sick or dead deer to their local FWP office. As of September 20, 2025, the agency has not released specific numbers regarding the deer deaths, but is actively monitoring the situation.
Hemorrhagic disease outbreaks are cyclical and typically occur during warm, dry weather conditions that favor the proliferation of the midge vectors. Montana has experienced HD outbreaks in the past, including a significant event in 2023. The disease is most prevalent in late summer and early fall.
FWP encourages hunters and landowners to be vigilant and report any unusual deer behavior. Further updates will be provided as laboratory results become available. More information about hemorrhagic disease can be found on the FWP website: https://fwp.mt.gov/conservation/diseases/ehd-blue-tongue.
