ALBUQUERQUE, N.M. – New Mexico is seeing a dramatic surge in tree mortality, and state forestry officials say native bark beetles are at the center of the problem. According to forest health surveys, an estimated 209,000 acres of trees died in 2025, a steep jump from about 67,000 acres the year before. Much of the damage is concentrated south of I‑40, including areas of the Lincoln National Forest near Ruidoso and parts of the Gila National Forest west of Socorro.
While bark beetles are a natural part of New Mexico’s forest ecosystem, recent environmental shifts—particularly warmer temperatures and prolonged drought—have fueled conditions that allow these insects to thrive. Beetles typically remain active when temperatures reach about 55 degrees Fahrenheit, and forestry officials reported those temperatures extended well into late September and even November in regions such as Datil, the Lincoln area, and the Gila. This longer warm period allows beetles to reproduce more frequently and spread across larger areas of forest.
The beetles’ attack begins when drought-stressed trees release chemicals that the insects can detect. Once a tree signals distress, beetles bore through the bark and start carving tunnels—known as galleries—in the soft inner tissue. This is where the damage accelerates. The insects effectively cut off the tree’s ability to transport water and nutrients, causing a slow decline that can’t be reversed. But the physical tunneling is only part of the problem. Beetles also carry a blue‑stain fungus, which spreads through the tree’s vascular system, further blocking the flow of water and hastening the tree’s death. Forestry specialists say these combined effects can kill a tree in just a few months. Needles typically fade to red or brown within three to six months, and once dead, trees may stand for two to six years before falling.
Several beetle species are involved in the current die-off, each attacking different parts of the state’s diverse forests. Piñon ips beetles are heavily affecting New Mexico’s iconic piñon pine. Ponderosa pine bark beetles—including species such as the southwestern pine beetle and the pine engraver—have contributed to rising mortality in ponderosa forests, where deaths increased from 5,500 to 32,000 acres in a single year. Higher-elevation forests are seeing damage from spruce beetles that target Engelmann spruce stands, while Douglas-fir beetles and fir engravers have been active near wildfire burn scars, overwhelming trees already weakened by extreme conditions.
Wildfire scars themselves have become hotspots for beetle activity. Conditions in those landscapes—hotter soils, reduced moisture, and lingering stress—make surviving trees especially vulnerable. Near the 2022 Calf Canyon/Hermit’s Peak burn area, Douglas-fir beetles and fir engravers destroyed an additional 15,000 acres of mixed conifer forest. State forestry officials link this kind of post-fire beetle surge to the broader climate trends shaping the region: hotter, drier conditions have made it harder for trees to recover and easier for beetles to expand.
Despite the scale of the damage, experts emphasize that bark beetles aren’t inherently destructive. Under normal conditions, they serve as part of the ecosystem’s natural cycle, targeting weakened trees and helping open space for younger growth. But with the climate shifting and drought intensifying, their role has expanded far beyond its ecological balance. The result is widespread mortality that not only alters forest structure but also increases wildfire risk. Dead trees—standing or fallen—add significant fuel to the landscape, raising concerns about the severity of future fire seasons.
To counter the trend, the Forestry Division says prescribed thinning remains one of the most effective management tools. By reducing tree density, thinning eases competition for water and sunlight, strengthening the remaining trees and improving their ability to defend against beetle attack. Alongside thinning, aerial surveys conducted each summer help monitor beetle activity and provide real-time insight into how conditions are shifting across the state’s forests.
Taken together, the data paints a clear picture: New Mexico’s bark beetle populations are responding directly to a warming climate and long-term drought. With hundreds of thousands of acres already affected, forestry officials say the state is now at a critical point—one where forest management, climate patterns, and insect behavior are more interconnected than ever.
