Korea Autumn Foliage 2026: Peak Dates & Best Spots

Korea’s autumn foliage peaks in 2026 between about 20 October in the northern mountains and mid-November on Jeju and the south coast. The Korea Forest Service’s forecast map, published on 22 September, gives Seoraksan 20 October, Songnisan 28 October, Naejangsan 4 November and Hallasan 6 November. Seoul’s ginkgo-lined streets usually fall in between.

That is the short answer. The rest of this guide explains why the published dates disagree by up to a week, where to check the real colour before you travel, and the practical details at the three places most visitors aim for: Seoul, Seoraksan and Naejangsan. Every date and price below was checked on 5 October 2026.

2026 peak dates by mountain

The most useful official forecast is the Korea Forest Service’s 2026 Korean Peninsula Foliage Peak Prediction Map (2026년 한반도 단풍절정 예측지도). It combines plant observations from public arboretums since 2009 with the National Institute of Forest Science’s mountain weather network. The Forest Service says this year’s peak is about 0.8 days later than the average of the last five years, so 2026 is a fairly normal year.

The colour arrives at different times for different trees, and the Forest Service publishes those too. Oaks turn the hillsides brown-gold, maples give the red, and ginkgo gives the bright yellow you see on city streets.

The gaps inside one mountain matter. At Seoraksan the whole-mountain peak is 20 October, but its oaks peak on 25 October. At Naejangsan the oaks are forecast for 26 October, more than a week before the maples that make the valley famous. If you are going for red maples rather than general colour, lean towards the later date.

Why the forecasts disagree

Search “Korea foliage 2026” and you will find dates that differ by several days for the same mountain. Nobody is wrong; they are counting different things.

• Korea Forest Service: peak = the day 50% of leaves have changed colour. This is the map above.
• Korea Meteorological Administration (KMA): first colour = about 20% of the mountain turned, counting down from the summit; peak = about 80% of the whole mountain turned. KMA observes rather than forecasts: it announces the dates when they happen.
• Kweather (a private forecaster): uses the same 20% / 80% definitions as KMA, and does publish a forecast.

Because 80% takes longer to reach than 50%, KMA-style peaks fall later. Seoraksan shows the gap clearly. KMA’s normal peak there is 17 October, and in 2025 it came on 24 October. Kweather’s 11 September outlook put the 2026 peak in the central region between 19 October and 1 November and in the south between 1 and 11 November, about two weeks after first colour in each place.

The first colour has already arrived. The Forest Service recorded this year’s very first turning leaves on 14 September in the Jeombongsan forest reserve in Inje, Gangwon, from a citizen observer. KMA’s official first colour on Seoraksan came on 28 September 2026, exactly on the normal date and four days earlier than in 2025 (2 October). Kweather had forecast 30 September.

Temperature drives all of this. Kweather notes that leaves start to turn once daily minimum temperatures fall below about 5°C, and that in 2021–2025 September and October averaged 2.3°C and 1.4°C warmer than in the 1990s. That is why peaks have been creeping later, and why a warm spell can push this year’s dates back by a few days.

Check the real colour before you go

Two free official tools show what the mountains actually look like right now. Both are in Korean, but they are mostly photos and maps.

Seoul: ginkgo streets, palaces and parks

You don’t need to leave the city for autumn colour. Ginkgo is the most common street tree in Seoul (34.7% of them, according to the city), and it turns a clean yellow. The Seoul Metropolitan Government publishes a list of foliage streets every autumn. Its latest, from 29 October 2025, named 110 routes covering 167 km and about 72,000 trees, viewable on the city’s Smart Seoul Map. That article estimated last year’s peak at around 25 October on Bukhansan and late October to mid-November in the city centre. A 2026 list had not been published when we checked on 5 October.

Places from the city’s list that are easy to reach and combine with sightseeing:

• Samcheong-dong-gil (Dongsipjagak to Samcheong Tunnel, 1.2 km): ginkgo along the east wall of Gyeongbokgung, past galleries and museums.
• Jeongdong-gil and Deoksugung-gil: ginkgo beside Deoksugung’s stone wall and early-modern buildings, next to City Hall.
• Seoul Forest: a grove of 600 ginkgo trees.
• Namsan Park: the car-free roads around the mountain, good for an easy walk.
• Wiryeseong-gil in Olympic Park (Peace Gate to South Gate 2, 2.7 km): double rows of ginkgo.
• Yangjaecheon stream (Seocho/Gangnam): cherry trees and reeds along the water.

The palaces are the other classic. The Secret Garden (Huwon) at Changdeokgung is the best-known autumn view in central Seoul, but it can only be seen on a guided tour, and the Korea Heritage Service warns that October and November tours sell out quickly. Tickets go online six days ahead at 10:00 Korea time, and the tour costs ₩5,000 on top of the ₩3,000 palace ticket. Our 7-day Seoul itinerary has the booking steps, palace closing days and the integrated ticket.

October is also the easiest month for walking around: Seoul averages a 20.2°C high and 10.6°C low with little rain, as our Korea weather by month guide shows. Bring a warm layer for evenings and for any mountain.

Seoraksan: the first big peak

Seoraksan National Park, above Sokcho on the east coast, is where the season starts and the one most visitors try for. The Forest Service forecast is 20 October; on KMA’s 80% measure expect a few days later. Weekends around the peak are the busiest of the year.

Getting there from Seoul. The Seorak Cable Car’s directions give about 2 hours 30 minutes by express bus or 2 hours 10 minutes by intercity bus to Sokcho, with buses about every 30 minutes. From Sokcho, city buses 7 and 7-1 run from the bus terminals to the Seoraksan car park at the end of the line, next to the Sogongwon area where the cable car and the main trails start.

The cable car to Gwongeumseong is the easy way to get a ridge-top view. It runs 1,128 m from Sogongwon to an upper station at 699 m in about five minutes.

Cars run every 10–15 minutes when it is quiet and every 5 minutes when busy. A ticket can be refunded in full up to 10 minutes before your boarding time, and missing your slot costs 20% to rebook. Operating hours change with the weather and are posted on the homepage each day.

Heullimgol, on the south side near Osaek, is one of the classic foliage walks, and it is booking-only in autumn (details in the next section). It is a one-way, 3.1 km route downhill from the Heullimgol trail centre to the Yongso junction. Plan how you will get back to your car or bus before you book. If it’s full, nearby Jujeongol needs no reservation.

Naejangsan: the southern classic

Naejangsan National Park, near Jeongeup in North Jeolla, is the best-known maple valley in the south, and the Forest Service forecasts its peak for 4 November. It is a long day trip from Seoul. The usual route is the KTX to Jeongeup Station, then a city bus or taxi to the park; our guide to booking KTX tickets covers how to get seats before a busy weekend.

In foliage season, KTO’s listing advises parking in the car parks and riding the return shuttle bus run by the national park office. Inside the valley, the cable car runs from near the visitor centre to the middle of Yeonjabong. The top station is about 10 minutes’ walk from an observatory looking over the valley.

These cable-car prices come from Korea Tourism Organization data (via K-Trip Tips), last updated in April 2026; the operator’s own site did not show a fare table when we checked, and some Korean blogs quote older, lower prices.

The ridge walk from Seorae to Seoraebong and Byeongnyeonam (2.8 km) is booking-only in October and November, capped at 520 people a day. Weekend places go fast.

Trails you must book in autumn 2026

Korea’s national parks cap numbers on some sections in autumn, and you need a reservation on the Korea National Park Service booking site before you walk them. According to Maeil Shinmun’s 5 October 2026 summary of the rules, 16 national parks run booking-only sections this autumn.

How the national-park system works:

• One person can book for up to 10 people, first come, first served.
• Online booking closes at 14:00 the day before. Unpaid and cancelled places are released in real time, so check again around midnight and early in the morning.
• There is a 24-hour automated phone line (1670-9202), in Korean. In past seasons the park service has also taken phone bookings from foreign visitors through each park office (a 2022 notice); the 2026 notices we found didn’t repeat this, so call the park office to check.
• No-shows are banned from booking for one month, two no-shows for three months. Cancel even on the morning if the weather turns.
• Walking a closed or booking-only section without a reservation, or leaving the marked trail, costs ₩200,000 the first time, ₩300,000 the second and ₩500,000 after that.
• Screenshot the QR code before you go; mountain valleys often have no signal.

Jeju and Hallasan: the last peak

Hallasan’s forecast peak is 6 November, and Jeju’s lowland ginkgo at Halla Arboretum peaks around 16 November, the latest date on the Forest Service map. That makes Jeju a good choice if you can only travel in mid-November.

The two summit trails, Seongpanak and Gwaneumsa, need a reservation on Jeju’s own Hallasan booking site (not the national-park one). Bookings for a month open at 09:00 on the first working day of the month before, so November places have been open since 1 October. The booking QR code is sent to your phone, and a no-show bans you for three months (a second for a year).

Trailheads close to new hikers around midday, but the booking site currently shows two different tables. One gives 11:30 at Seongpanak for October to March; the other gives 12:30 for September–October and 12:00 for November. Plan to start by 11:30 to be safe. Trails open at 05:30 in September–October and 06:00 in November. For where to base yourself on the island, see our Jeju area guide.

A simple foliage plan for a 2026 trip

A few practical rules:

• Go on a weekday if you can. Peak weekends fill the Seoraksan buses, the cable-car queues and the booking-only trails first.
• Start early. Booking slots, cable-car waits and Hallasan cut-offs all reward a morning start.
• Dress for the mountain, not the city. It is much colder on the ridges than in Seoul’s 20°C afternoons, and the Seorak cable car’s cabins have no heating.
• Keep one flexible day. Rain or strong wind can stop the cable cars, and a warm week can push the peak back by several days.
• Add a night festival in the south. The Jinju Namgang Yudeung (Lantern) Festival runs from 3 to 18 October 2026 on the Namgang river in Jinju, South Gyeongsang, according to the city’s confirmed 2026 schedule. Jinju is far from Seoraksan, so it fits better with a southern loop that includes Naejangsan or Busan than with a Gangwon trip. For a Gangwon trip, the Gangneung Coffee Festival (21–25 October) starts the day after the Forest Service’s forecast Seoraksan peak (20 October); our autumn festivals calendar lists every confirmed October–November 2026 date.

More seasonal guides, including festivals and holiday travel, are collected in our Seasons & Festivals section.