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Korea's 2026 fall foliage forecast is out — autumn is late, and early October is a trap

Reported 2026-09-10 / Posted 2026-09-10 Updated · 2026-10-16 · Compiled from Korean foliage forecasts and media reports · By
Updated · 2026-10-16

Odaesan at peak, first color on Bukhansan, Jirisan and Hallasan (October 16 update)

The Korea Meteorological Administration (KMA) found Odaesan at peak on October 14, with about 80% of the mountain turned, YTN reported on October 15. On the same day it observed first color, about 20% turned from the summit down, on Bukhansan, Jirisan and Hallasan. Jirisan turned earlier than the October 22 – November 5 window this article gave for the south. Separately, the Korea Forest Service's National Recreational Forest Management Office (국립자연휴양림관리소) released a peak-color map for 48 national recreation forests, Newsis reported on October 15. It runs from around October 21 at Sambong in Gangwon to around November 17 at Jindo in the far southwest, with Yumyeong in Gyeonggi around October 31 and the Jirisan recreation forest around November 2.

Updated · 2026-10-15

Official peak dates from the Korea Forest Service, and Seoraksan is turning (October 15 update)

The Korea Forest Service (산림청) forecasts peak color at Seoraksan around October 20, Songnisan around October 28, Naejangsan around November 4 and Hallasan around November 6, Newsis reported on October 12. The KFS counts a mountain as at peak once about 50% of it has turned; the Korea Meteorological Administration (KMA) uses about 80%, so peak dates from the two agencies can differ. Some of the September forecast dates in this article differ from the KFS dates: it placed Naejangsan at November 5–13 and central Korea, where Songnisan is, at October 31 – November 5. Where they differ, go by the KFS dates. The KMA recorded Seoraksan's first color on September 28, its normal date, Segye Ilbo reported. MBC Chuncheon reported on October 13 that peak color has begun around Baekdamsa (백담사) temple in inner Seoraksan, and that a new 5.7 km walkway from the Yongdae-ri parking lot to Baekdamsa, separate from the shuttle-bus road, is expected to open fully around October 23.

Korea's 2026 fall foliage forecast is out, and it carries one blunt warning for trip planners: the color is running late. After the record-hot summer — the one our heatwave safety log tracked week by week until it finally broke — Korean forecasters said in early September that September and October daily temperatures would stay above normal, pushing first color past the historical average. In the event, the KMA recorded Seoraksan's first color on September 28, its normal date. The practical upshot: if you booked "early October for foliage," you will mostly find green mountains. This year, the real show runs from late October to mid November. Here is the region-by-region timetable so you can time it right.

The essentials

  • First color: forecast for Seoraksan around September 27–30 (one outlet marked October 3 as the start); the KMA observed it on September 28, the normal date; the foliage front then rolls south at roughly 20–25 km per day
  • First foliage elsewhere: central Korea October 10–27; Jirisan and the southern regions October 22 – November 5 (Jirisan turned earlier, on October 14; see the update above)
  • Peak color (절정): Seoraksan and Odaesan October 16–25; central regions — including the mountains around Seoul — October 31 – November 5; Jirisan and the south November 5–13. The Korea Forest Service's own dates differ in places: Seoraksan around October 20, Songnisan October 28, Naejangsan November 4, Hallasan November 6 (see the update above)
  • Why it's late: after the record summer, September and October average temperatures were forecast above normal, which was expected to delay the first color; Seoraksan's first color still came on its normal date
  • Bottom line: the safe window for classic foliage is late October through mid November — not early October

How the foliage front works

Korean foliage forecasts use two markers, and knowing the difference saves trips. "First foliage" (첫단풍) means about 20% of a mountain has turned — pretty in photos taken from the summit, patchy from the trail. "Peak" (절정) is when most of the mountain is in full color, and it lands roughly two to three weeks after first color at any given spot. The color starts on the high peaks of the northeast — Seoraksan — and the front then moves south across the country at about 20–25 km a day. That is why Seoraksan peaks in mid-to-late October while Naejangsan in the southwest, arguably Korea's most famous foliage mountain, saves its show for November.

The 2026 timetable, region by region

  • Seoraksan (northeast): first color September 27–30, peak October 16–25 (Korea Forest Service: around October 20) — Korea's classic alpine foliage, and always the first act
  • Odaesan (Gangwon): peaks alongside Seoraksan, October 16–25 — quieter trails, same window; the KMA found it at peak on October 14, about 80% turned
  • Central Korea: first foliage October 10–27, peak October 31 – November 5 — this includes the mountains ringing Seoul, like Bukhansan; the Korea Forest Service puts Songnisan, in central Korea, earlier, at around October 28; the KMA observed Bukhansan's first color on October 14
  • Seoul city itself: the palaces, Namsan and the ginkgo streets typically peak in early November, a beat after the surrounding mountains
  • Jirisan and the south: first foliage October 22 – November 5, peak November 5–13; the KMA observed Jirisan's first color on October 14
  • Naejangsan (southwest): the famous late show; we placed it in that same November 5–13 southern window, but the Korea Forest Service forecasts its peak around November 4

Match the forecast to your travel dates

  • September 27 – October 10: only Seoraksan's high slopes are starting to turn; everywhere else is still green and faintly summerish. Enjoy the hiking weather — just don't build the trip around foliage.
  • Mid-to-late October: Seoraksan and Odaesan hit peak — the best classic alpine foliage of the year.
  • Late October – early November: central Korea peaks, including Bukhansan over Seoul; the city's palaces and streets follow in early November.
  • November 5–13: Jirisan, Naejangsan and the south — the last act, and often the most famous one (Naejangsan's maple valley is the postcard; the Korea Forest Service expects its peak around November 4).

Three practical notes. First, trains: KTX and SRT now book in one app, Korail+, and foreigners can reserve two months ahead — our Korail+ guide covers it, including the update on Chuseok holiday crowds in late September, which you'll want to route around. Second, money and timing: entry to Korea's main national parks is free, but popular foliage weekends get seriously crowded — go on a weekday and start early. Third, this autumn the culture ministry and KTO are running a trekking campaign around the Korea Loop Trail and the new Dongseo Trail — our Dongseo Trail article has the details if you want foliage on foot rather than from a cable car. Stuck on any of it? The 1330 tourism hotline is free, 24/7 and multilingual.

Honest take

A foliage forecast is a planning anchor, not a promise. These windows come from early-September projections, and they get revised as autumn actually arrives — a sharp cold snap can pull peak color forward by days, and another warm spell can push it back. That revision has begun: where our dates differ from the Korea Forest Service dates in the update above, go by the official ones. Treat the dates above as your first draft, then check the KMA the week you fly. The good news hiding in a late autumn: it stretches the season deep into November, when flights and rooms are cheaper and the most famous late-turning mountains — Naejangsan above all — are at their absolute best. Early October is the trap this year; November is the reward.

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