Autumn foliage in Korea 2026: Seoraksan to Naejangsan, week by week

How the colour moves: the 2026 forecast

On 8 September 2026 VisitKorea, the Korea Tourism Organization's English site, published its fall foliage forecast, credited to the private forecaster Weatheri. It put the first colour at Seoraksan on 3 October, Bukhansan on 23 October, Jirisan on 28 October and Hallasan on 31 October, and expected peak foliage across the country from mid-October to early November. The predicted peaks were Seoraksan around 25 October, Bukhansan around 4 November, Jirisan around 5 November, Naejangsan around 11 November and Hallasan around 13 November.

Read those dates as a guide to order, not a booking calendar: the forecast itself warns that actual dates change with the weather. What holds every year is the direction. The colour starts high and in the north-east, reaches Seoul and the central and southern mountains later, and ends in the warmer south-west and on Jeju. If you can travel for only one week, choose the region that matches your dates rather than trying to see the famous names in one go.

The forecast is also a crowd calendar. VisitKorea's own feature on less crowded foliage spots says the famous mountains, Seoraksan and Odaesan among them, are always packed in the season. Expect the weekends around each peak to be the busiest days of that park's year, and plan the hikes you care about for a weekday.

• Early to mid-October: colour on the high ridges of Seoraksan; the lower valleys are still mostly green.
• Late October: Seoraksan's forecast peak (about 25 October); Odaesan and the Gangwon valleys; Bukhansan just starting.
• Early November: Seoul and Bukhansan (about 4 November), Jirisan (about 5 November), and the gardens around Seoul.
• Mid-November: Naejangsan (about 11 November), Baegyangsa and the south-west, then Hallasan on Jeju (about 13 November).

Late October: Seoraksan and Odaesan in Gangwon State

Seoraksan is the first big park to colour, and it rewards an overnight stay more than a day trip. Sleep in Seorak-dong at the park entrance or in Sokcho, and choose your Seoraksan by fitness: the cable car and the flat valley walk to Biseondae for an easy day, Ulsanbawi for a steep half-day, or Daecheongbong from Osaek for a hard summit day. Our Seoraksan guide has the routes in detail.

Two rules matter in the foliage season. First, trail entry hours: when we checked on 2026-10-03, the Korea National Park Service (KNPS) listed entry from Osaek towards Daecheongbong at 03:00–12:00 from April to October and 04:00–11:00 from November to March. Second, Heullimgol, the short valley walk on the Osaek side, runs on a reservation system in October and November, with entry from 09:00 to 14:00, according to the same KNPS page. Book it on the national park reservation site as soon as you know your date.

Seoraksan's upper trails also close for forest-fire prevention. VisitKorea listed the closure of the upper sections from Biseondae to Daecheongbong from 15 November to 15 December (and 2 March to 15 May), in a column last updated in September 2024, so a November summit attempt is not a safe plan.

Odaesan, south of Seoraksan in Pyeongchang, is the gentler alternative. VisitKorea describes the Seonjae-gil, a 9 km forest road from Woljeongsa to Sangwonsa once used by monks, as famous for its foliage along the valley and suitable for older walkers and families with children. It suits a day when you want colour without a climb. It is not a crowd-free choice, though: VisitKorea names Odaesan alongside Seoraksan as one of the packed autumn mountains, so go early.

Early November: Seoul, Bukhansan and Gapyeong

Seoul colours later than Gangwon, which makes the capital the natural middle stage of a foliage trip. The 2026 forecast expected Bukhansan, the mountain park on Seoul's northern edge, to peak around 4 November, and named Gyeongbokgung Palace, Seoul Forest, Olympic Park and N Seoul Tower as the city's popular foliage spots. These need no planning beyond the subway.

For something less obvious inside the city, VisitKorea's guide to Seoul's autumn forests picks Seoul Forest in Seongsu-dong for its metasequoia and ginkgo trees turning gold, Olympic Park for the path along Seongnaecheon Stream that is also called the Fall Foliage Path, Haneul Park above World Cup Stadium for its hilltop silver grass, the Dream Forest in Gangbuk for easy paths lined with oak and maple, and Seokchonhosu Lake by Jamsil for cherry trees that turn crimson. The column was last updated in August 2025.

Just outside Seoul, the forecast lists Nami Island and The Garden of Morning Calm, both in the Gapyeong area, among the famous foliage attractions on the city's outskirts. When we checked on 2026-10-03, VisitKorea listed Nami Island as open 08:00–21:00 with ferries from Gapyeongnaru Pier, and noted longer opening hours in the fall foliage season; it listed the Garden of Morning Calm as open 08:30–19:00. Both are at their busiest on autumn weekends. Our Gapyeong guide covers trains, ferries and where to stay.

Mid-November: Naejangsan, Baegyangsa and the south-west

VisitKorea calls Naejangsan the best mountain in Korea for autumn foliage, and its nickname, the Geumgang of Honam, refers to the same fame. The 2026 forecast expected its peak around 11 November, the last of the mainland mountains on the list. That makes it the natural end of a trip that starts in Gangwon; expect the weekends around the peak to be very busy.

Go by train. VisitKorea's rail guide notes that Jeongeup Station on the Honam Line is especially famous in autumn for hikers heading to Naejangsan, and its Jeongeup page says that at the foliage peak the KTX makes the trip much easier and avoids traffic jams. The Honam Line starts at Yongsan Station in Seoul. Sleep in Jeongeup or at the park entrance in Naejang-dong so you can be on the trail early. When we checked on 2026-10-03, KNPS listed entry at the Naejangsan trailheads from 05:00 to 15:00 from November to March (04:00–16:00 from April to October), so a mid-November hike has to start by mid-afternoon at the latest. Our Naejangsan guide has the walks around Naejangsa and the cable car.

On the Jangseong side of the same park, Baegyangsa is a 6th-century temple where, VisitKorea writes, a forest path leads to a lake overlooked by Ssanggyeru Pavilion, a famous autumn scene. When we checked, VisitKorea listed it as open 24 hours with an adult admission of 3,000 won, and the temple runs temple stays booked through baekyangsa.templestay.com, a calmer way to be there at dawn.

Quieter alternatives to the famous valleys

In a feature on less crowded foliage destinations, VisitKorea suggests five places that work well when the big parks are packed. The column was last updated in August 2025, so check the current details on each official site before you go.

One more option is further away: Juwangsan National Park in Cheongsong, North Gyeongsang, a rocky park with valley walks to waterfalls. In autumn 2026 two notices matter. KNPS runs the 5.7 km Jeolgol entrance to Gamebong trail on a reservation system from 16 September to 14 November 2026, 09:00–18:00, for 1,350 people a day, booked at reservation.knps.or.kr; the notice warns of a fine of up to 500,000 won for entering without a booking. And the access road to Jusanji, the 18th-century reservoir with willows growing in the water, is closed from 25 August to 23 October 2026 for construction work, with parking at the Jusanji Theme Park car park and a walk in. Our Cheongsong guide has the detail.

• Hwadam Botanic Garden, Gwangju (Gyeonggi-do): an arboretum about 1 hour 30 minutes from Seoul by public transport, with gently sloping paths and a monorail loop. When we checked on 2026-10-03, VisitKorea listed 09:00–18:00 (last admission 17:00), closed on Mondays, with online reservation required and adult admission at 11,000 won. Taxi about 10 minutes from Gonjiam Station.
• Hongcheon Ginkgo Forest, Gangwon State: over 2,000 ginkgo trees on private land, open to the public only in October, 10:00–17:00 and free, according to VisitKorea. Check the county site (hongcheon.go.kr) for this year's dates before the long bus trip via Hongcheon and Nae-myeon.
• Seonunsa, Gochang (Jeonbuk State): an ancient temple best known for its spring camellias, with autumn colour along Dosolcheon Stream. Bus from Seoul's Central City terminal to Heungdeok, then about 20 minutes by local bus.
• Gwanbangjerim Forest, Damyang (Jeollanam-do): a 2 km forest along a 6 km embankment, best early in the morning when the autumn leaves meet the early morning fog. About 19 minutes' walk from Damyang Bus Terminal, and an easy add-on to a Naejangsan trip.
• Wondae-ri Birch Forest, Inje (Gangwon State): some 70,000 birch trees. VisitKorea listed it as closed on Mondays and Tuesdays, with last admission three hours before closing; it fits a Seoraksan trip.