The Mosquito Fire ignited on Thursday August 17th, 2023, and, with other nearby fires, was managed as the 2023 Six Rivers Lightning Complex. The Fire Behavior Assessment Team (FBAT) started monitoring on the Mosquito Fire on Wednesday September 27th, 2023. Study plots were located within GIS polygons designated as containing Physical or Biological Features that would support breeding, denning, resting, or foraging (hereafter called PBF 1 habitat) by the Humboldt marten. The objectives included assessing the range of variability in shrub and overstory vegetation across polygons mapped as PBF 1 Humboldt marten habitat and to get a rough assessment of effects of the strategic firing operation by comparing paired burned and unburned plots. Paired plots were primarily in closed and moderately open conifer-dominated stands with moderate to high shrub cover at elevations between 3750-4350 ft. In addition, a set pf four plots were established in stands with a significant hardwood component at lower elevations (2200-3200 ft) in anticipation of continued firing that, ultimately, did not occur.