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Story summary
- Forecast predicts Portland’s peak fall colors between Nov 4-10, 2026.
- First foliage appears around Oct 9, 2026, with moderate color a week later.
- UC Davis Arboretum says cooler temperatures boost colors while warmth speeds chlorophyll loss.
- Reduced daylight stops chlorophyll production, revealing yellows, oranges, and reds.
- Terrain variations can shift peak color dates by several days.