Colorado’s top forest health concern is a mountain pine beetle outbreak on the Front Range that has expanded by nearly 150% from 2024 to 2025, according to a Colorado State Forest Service report. The report shows the continued spread of mountain pine beetles and other forest insects during the second consecutive year of above-average temperatures and below-average precipitation. Trees in forests across Colorado are stressed following a record warm winter and low snowpack, and infestations of bark beetles and western spruce budworm are expected to intensify and expand. “Heat and drought are stressing our forests, turning many areas into tinderboxes and making it harder for trees to fight off bark beetles and other insects,” said Matt McCombs, state forester and director of the CSFS. …Trees killed by drought, insects or disease can potentially alter wildfire behavior should there be ignition from lightning or other sources.