Rare and Fatal Mountain Lion Encounter in Northern Colorado

On January 1, 2026, a tragic incident occurred on the Crosier Mountain Trail in Larimer County, resulting in the death of a female hiker. This event is believed to be Colorado’s first fatal mountain lion attack in over a quarter-century.

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Sequence of Events

The victim was hiking solo near Glen Haven when the encounter took place. The timeline of the discovery is as follows:

• The Discovery: Around midday, two hikers happened upon the scene. One of the witnesses, a physician, attempted to provide medical aid but found the woman had already succumbed to her injuries.
• The Confrontation: A mountain lion was observed standing near the victim. The two hikers managed to drive the predator away by shouting and throwing rocks.
• Wildlife Intervention: Following the report, Colorado Parks and Wildlife (CPW) officers deployed tracking dogs. Two mountain lions found in the immediate vicinity were euthanized for public safety and forensic testing.

Current Investigation

While the evidence at the scene strongly points to a predatory attack, authorities are following a strict protocol to confirm the details:

• Forensic Analysis: Necropsies are being conducted on the lions to check for human DNA and signs of disease.
• Official Identification: The Larimer County Coroner’s Office is working to notify next of kin before releasing the victim’s name or the formal cause of death.

Historical Context

Mountain lion attacks on humans are exceptionally rare. In Colorado, there have been fewer than three dozen reported attacks since 1990. The most recent fatal encounter prior to this incident took place in 1999. Experts suggest that while mountain lions are active in Larimer County, they typically avoid human contact.

Safety Reminders for Hikers

Authorities remind those heading into the backcountry to:

1. Avoid hiking alone, especially at dawn or dusk.
2. Make noise to prevent surprising a lion.
3. If you encounter one: Do not run. Stand tall, look big, and fight back if attacked.