Fall Foliage Prediction 2024 Washington State. An exploration and prediction of 2050's fall foliage in washington state under a high emissions scenario The peak of fall foliage can start as early as september, and most locations will peak in either october or november.

When will the leaves start changing? By september 30, 2024, the map shows that parts of colorado, utah, montana, north dakota, minnesota, washington, and michigan’s upper peninsula will be at peak fall foliage, which is about the same as last.