In February 1999, Colorado state biologists began a program to reintroduce Canada lynx into the San Juan Mountains, releasing wild-caught animals from Alaska. In the first month, four of the first five released cats died, drawing heavy criticism and negative media coverage of the effort.

Canada lynx had inhabited Colorado’s high-altitude forests for thousands of years. Unregulated fur trapping in the late 19th century and government predator control programs reduced their numbers significantly. By 1973, the species was listed as endangered in the state. The last known native lynx was trapped near Vail the following year, and no lynx were found in 11 searches over the next two decades.

The initial failures led to a change in approach. Gene Byrne, who led the reintroduction program, and his team determined the lynx were not dying due to poor habitat but because of the release method. Standard practice at the time minimized how long animals were held before release, but stressed lynx were exhausting their body reserves before they could adapt to new terrain.

The program shifted to holding incoming lynx for at least 45 days, sometimes up to 90, while feeding them a high-calorie diet to build fat reserves. First-year survival under the original protocol was roughly 80%. Under the new protocol, survival exceeded 97%. Between 1999 and 2006, 218 lynx were released, all fitted with satellite transmitters.

Changes in the forest itself also aided the population. Between 2004 and 2016, a spruce beetle epidemic killed most of the mature spruce in the Rio Grande National Forest. While the dead trees looked like a serious habitat loss, the loss of the canopy allowed sunlight to reach the forest floor, prompting dense growth of young fir and spruce. This new understory provided ideal cover for snowshoe hares, a primary lynx prey. Lynx tracked with GPS collars showed they actively selected beetle-impacted stands over intact forest. When hare numbers dipped, the Colorado lynx also hunted red squirrels successfully.

By 2003, wild-born kittens were documented in the San Juan Mountains. Colorado Parks and Wildlife declared the reintroduction successful in 2010 after the population met all seven benchmark criteria. The program is considered a case study in how release methodology affects outcomes. A 1989 New York effort using different methods did not establish a population.

Data from the Colorado program has informed forest management policy. The 2020 Rio Grande National Forest plan avoided aggressive salvage logging in beetle kill zones. Tracking data also identified highway crossing points that led to wildlife overpass construction on Interstate 70.

The success has limits. The habitat benefit depends on how trees die. Slow beetle damage allows understory regrowth and shelter, while high-severity wildfire removes the understory and deadfall entirely, making an area unusable for lynx for years.

Estimates today place 75 to 100 lynx in southern Colorado’s mountains. The case continues to raise questions about whether conservation programs can rely on natural landscape transformation, even when a forest appears to be dying.