It is time for the fall foliage display of color to begin. California foliage starts around mid-to-late October in the higher elevations such as Mammoth Lakes, and you can also see the change at lower elevations into early November most seasons.
John Poimiroo, expert on fall foliage in California, says that you can track the foliage display from the cold mountain tops, and watch the color changes on the trees as the temps drop. Moving down the mountains as the colder weather begins to reach the lower elevations, you can see nature’s hand at work with demarcations. The changes usually begin right around now (early October) in Mammoth and the High Sierras.