Seoraksan is one of the first major mountain areas in Korea to show autumn color, and the 2026 forecast marks October 3 as the start. That does not mean the mountain is already at full color. VISITKOREA’s current foliage forecast expects Seoraksan to reach peak color around October 25. The useful distinction for travelers is therefore between first foliage and peak foliage. Early October can show the beginning of color change, especially at higher elevations, while lower areas and many valleys may still look largely green. That difference matters because foliage travel is often planned around a single date. In reality, Seoraksan changes by elevation, slope, weather and route. A photograph from one trail or one day should not be treated as a park-wide condition. For someone visiting now, the advantage is atmosphere rather than maximum color: cooler mountain weather, the first visible seasonal shift and less certainty about where the strongest color will be. For someone whose priority is dense autumn color, the current forecast points much later in the month. Practical planning should still begin with the National Park Service rather than the foliage forecast alone. Trail closures, weather restrictions, cable-car operation and route-specific access can change independently of leaf color. The park also has multiple approaches and a wide range of route difficulty. The editorial point is simple: 'first foliage' is useful information only when it is not mistaken for 'best day.' October 3 starts the season. It does not end the planning question.