Korea Autumn Foliage 2026 Peak Dates: Seoraksan Oct 20

When does autumn foliage peak at each Korean mountain in 2026?

The Korea Forest Service (KFS) forecast of 22 Sep 2026 puts peak colour at Seoraksan on 20 Oct and at Hallasan on 6 Nov, so the colour moves from north to south over about 2.5 weeks.

• Late October is the safe middle. The KFS expects most of the country to peak in late October, with peak dates about 0.8 days later than the average of the past five years.
• Go south if you arrive in November. Naejangsan (4 Nov) and Hallasan (6 Nov) are the last big peaks on the KFS map.
• Confirm 7–10 days out. Use the KMA observation page and the Korea National Park Service (KNPS) live cameras (Seoraksan Ulsanbawi, Bukhansan Baegundae, Jirisan Cheonwangbong and others).

What is the difference between first colour and peak, and where is the colour now?

"First colour" (첫 단풍) is when about 20% of a mountain has turned, starting from the summit (KMA definition); "peak" (절정) is a later stage, and the two agencies define it differently.

2026 so far (as of 2 Oct 2026):

• The KFS logged the season's first colour on 14 Sep at the Jeombongsan forest genetic resources reserve (Gangwon), from a citizen observation.
• KMA lists first colour at Seoraksan (photo dated 28 Sep) and Odaesan (photo dated 1 Oct); its other 19 observed mountains, including Bukhansan, Naejangsan, Jirisan and Hallasan, were still "before colour".
• KNPS listed Seoraksan's trails as operating normally (status since 17 Aug 2026).

Private forecaster Weather i, which uses the 80% definition, put Seoraksan's fullest colour around 25 Oct in its 4 Sep outlook; treat that as one private estimate, not an official date.

How do you get to Seoraksan, Naejangsan and Hallasan for the colours?

Seoraksan is a day trip by bus from Seoul to Sokcho, Naejangsan is reached by KTX to Jeongeup, and Hallasan's summit needs an advance booking.

Seoraksan

Naejangsan

Hallasan (Jeju)

What should you wear, and how do you avoid the crowds?

Pack for mornings near 10 °C in October and near 4 °C in November, and avoid weekend mornings at the famous spots.

• Layers: a light down or wool jacket over a long-sleeve top; ridges are colder and windier than the city.
• Timing: travel on Friday afternoon and start on the trail early Saturday, or go midweek.
• Late-November trails: KNPS usually closes some high trails for the autumn wildfire-prevention period from mid-November, so check the KNPS trail-control page before booking.
• Arriving at Incheon? The AREX express train is the quickest rail link to Seoul Station; see Incheon Airport to Seoul for all options, and the Korea packing checklist for T-money and eSIM.

General information — trail closures and weather can change quickly, so check official park pages on the day.