Over-logging, invasive species, and bark beetle infestations all pose significant threats to the Sierra Nevada's forests.

The Sierra Nevada's forests face several serious threats that disrupt their health and biodiversity. Over-logging has led to habitat loss and a reduction in forest resilience. Invasive species, such as non-native plants and animals, compete with native species, disturbing the ecosystem. Additionally, bark beetle infestations have become more severe due to warmer temperatures, which weaken trees and make them more susceptible to attacks. These combined threats exacerbate forest degradation, increase the risk of wildfires, and hinder conservation efforts in the Sierra Nevada.