Wildlife Agency Attributes Emergency Closure to Disease, Habitat Loss, and Predator Pressure
A stealthy woodland predator known for its tree-climbing skills and secretive nature is facing significant decline in Illinois forests. In July 2025, the Illinois Department of Natural Resources (IDNR) announced an emergency closure of the gray fox hunting and trapping season, following years of documented population decline.
Although sightings have historically been rare, recent data reveals a troubling trend: the gray fox (Urocyon cinereoargenteus) may be quietly disappearing from substantial portions of its historical range. The decision to close the season is part of a broader conservation effort aimed at preserving this native species before it reaches a critical point.
Significant Decline in Gray Fox Sightings Across Illinois
From 2022 to 2025, researchers at Southern Illinois University-Carbondale (SIU-C) conducted a comprehensive camera trap survey across multiple counties in southern Illinois. With over 200,000 trail camera photos collected, fewer than 0.09% featured gray foxes—a dramatic decline compared to a similar study conducted from 2008 to 2010.
This finding is corroborated by trapper harvest reports, indicating that the annual gray fox harvest has plummeted from hundreds in the 1980s to fewer than 30 animals per year in recent seasons. Trapper observation logs, landowner interviews, and hunter surveys also reveal sharp declines in statewide sightings, particularly in central and northern Illinois.
“We used to catch them regularly,” noted a longtime trapper. “Now, you can run an entire line and not see a single track.”
Canine Distemper Virus Confirmed in Illinois Gray Foxes
Laboratory testing of gray fox carcasses has confirmed the presence of canine distemper virus (CDV), a contagious disease that severely impacts the immune and nervous systems of wild canids, raccoons, and skunks.
Veterinarians and wildlife rehabilitators across Illinois have reported an increase in distemper cases since the mid-2010s. Milder winters may exacerbate the issue by allowing the virus to persist longer in the environment. Infected animals often exhibit disorientation, tremors, or respiratory distress prior to death.
Coyote Population Adds Additional Pressure
Distemper is not the sole factor contributing to the decline. Coyotes, which have aggressively expanded throughout Illinois over the last fifty years, frequently kill gray and red foxes during territorial disputes. While red foxes have adapted by moving into agricultural and suburban areas, gray foxes remain reliant on dense forest and brush habitats, where they face direct competition with coyotes.
Emergency Season Closure Becomes Law
On June 30, 2025, Governor JB Pritzker signed Public Act 104-0019, granting IDNR the authority to suspend the gray fox hunting season based on scientific evidence. Shortly thereafter, on July 9, IDNR filed emergency administrative rules to close the season statewide.
This marks the first time in decades that gray fox harvest will not be permitted during Illinois’ fall and winter trapping season.
“We aim to allow the population to stabilize while we gather more information,” stated Stan McTaggart, IDNR’s furbearer program manager. “Our goal is not permanent closure but responsible stewardship.”
The closure applies to both hunting and trapping and will remain in effect until new population data indicates recovery.
Next Steps: Monitoring, Research, and Public Reporting
SIU-Carbondale and IDNR will continue long-term population monitoring through 2026, which includes:
- Camera surveys in southern Illinois woodlands
- Distemper testing of recovered carcasses
- Potential GPS collaring of surviving gray foxes
- Mapping of viable habitat corridors
Biologists hope to identify gray fox strongholds and assess whether targeted habitat restoration—particularly along forest edges and streams—can facilitate recovery.