Autumn foliage season in Korea, called danpung (단풍), is happening right now, but it doesn't arrive everywhere at once. It starts on the high ridges of Gangwon in late September, slides down the mountains and south across the peninsula, and reaches Seoul's palace walls and ginkgo-lined streets weeks later. If you're in Korea this month, or flying in soon, the date you pick matters more than the place.
This guide compares the 2026 forecasts from official sources, explains why their dates don't match, and turns them into a plan: when to head for the mountains, when to stay in Seoul, and how to reach Seoraksan from the capital. Everything here is as of October 16, 2026.
Key takeaways
- The Korea National Park Service expects Seoraksan to peak around October 25 and Bukhansan, on Seoul's northern edge, around November 4, 2026.
- Forecasts differ by up to a week because agencies measure "peak" differently. High slopes turn first, valleys and cities last.
- Our suggestion: mountains in Gangwon from roughly October 17 to 27, then Seoul's streets and parks from late October into mid-November.
Contents
1. Where the color is right now (mid-October 2026)
Odaesan is at its peak, Seoraksan is close
On October 16, SBS reported that Odaesan (오대산) had reached peak foliage, with color covering the slopes between roughly 900 and 700 meters. On Seoraksan, the color that began at Daecheongbong Peak in late September had worked its way down to the Yongso Waterfall area at around 500 meters, and the valleys around Baekdamsa Temple in Inner Seorak were turning too. The broadcaster said Seoraksan was expected to peak around the following week.
One practical update from that report: this year the Baekdam Valley walking trail has been separated from the shuttle bus road.
The first color has reached the rest of the country
The same report noted first foliage on October 14 at Bukhansan (북한산), Jirisan and Hallasan, and on October 15 at Woraksan. "First foliage" is an official term; section 3 explains it.
How fast does it move? When Seoraksan's first color was declared on September 28, Korea JoongAng Daily reported that the front was expected to travel south at about 20 to 25 kilometers a day.
2. 2026 peak foliage dates by mountain
The Korea National Park Service (KNPS) published its peak forecast for major national parks on October 16, 2026. The Korea Forest Service (산림청) released its own maple forecast map on September 22. Here they are side by side.
| Mountain (region) | KNPS peak forecast | Forest Service maple peak |
|---|---|---|
| Odaesan (Gangwon) | Oct 16 (reported at peak) | — |
| Seoraksan (Gangwon) | Oct 25 | Oct 20 |
| Chiaksan (Gangwon) | Oct 31 | — |
| Bukhansan (Seoul) | Nov 4 | — |
| Songnisan (central) | Nov 4 | Oct 28 |
| Jirisan (south) | Nov 5 | — |
| Naejangsan (southwest) | Nov 11 | Nov 4 |
| Hallasan (Jeju) | Nov 13 | Nov 6 |
Sources: KNPS forecast as reported by The Hankyoreh (Oct 16, 2026); Korea Forest Service map as reported by Money Today (Sept 22, 2026); Odaesan status from SBS (Oct 16, 2026). All dates are forecasts as of October 2026 and shift with the weather.
The Forest Service said its 2026 peaks are about 0.8 days later than the average of the past five years, so 2026 looks like a fairly typical year.
3. Why the forecasts disagree, and which one to trust
Three agencies, three definitions
The Korea Meteorological Administration (KMA) uses a whole-mountain view. It declares first foliage when about 20 percent of a mountain, measured down from the summit, has changed color, and peak when about 80 percent has. The Forest Service's map works differently: it tracks tree species and calls the peak when leaves are 50 percent or more colored, a threshold the National Arboretum also uses in its location search tool. A 50 percent tree hits its mark before an 80 percent mountain does, which explains most of the gap in the table.
The KNPS dates also match those of private forecaster Weatheri, published by the Korea Tourism Organization in September.
How we'd use them
Our take: treat the earlier Forest Service date (a 50 percent tree threshold) as the opening of the good window and the later KNPS date as the likely high point. For Seoraksan, that means roughly October 20 to 25. Color also moves downhill, so upper trails can be past their best while valleys are just starting. Early in the window, go higher. Late in it, stay low.
Check live conditions before you go
For the final call, the KMA's Gangwon office runs a foliage service with dated photos from points around Seoraksan, including Sogongwon (the main entrance area), Daecheongbong and the Huiungak shelter. It's in Korean, but photos need no translation. The National Arboretum's search service (Korean) lets you type a place name and get an expected peak date for that exact spot.
4. Fall foliage inside Seoul: streets, palaces and parks
In late October or November, you don't need to leave the city. The Seoul Metropolitan Government keeps a list of 110 autumn-leaf roads covering 167 kilometers. Its foliage page gives Bukhansan's peak as around November 4, matching KNPS. An article on the city's news site last autumn noted that downtown streets usually look their best in early November and stay pretty into mid-month.
Downtown walks (good for a half day)
- Jeongdong-gil (정동길): a 0.5 km street of ginkgo and zelkova trees beside Deoksugung Palace, which the city designated its first "street you want to walk." It gets packed at lunchtime.
- Deoksugung-gil: 0.3 km beside the palace's stone wall.
- Sejong-daero: 0.9 km of ginkgo trees along Gwanghwamun Square.
- Samcheong-dong-gil: 1.2 km of ginkgo and zelkova among galleries and cafes, a natural continuation after Gyeongbokgung.
Chained together, they make an easy, mostly flat walk ending near Gyeongbokgung. For the palace itself, see our guide to strolling Gyeongbokgung in hanbok.
Parks with more space
- Olympic Park (Wiryeseong-gil): a 2.7 km ginkgo route. The park's woods are more than 20 years old, so the trees are big.
- Seoul Forest: a 0.5 km ginkgo path near the Han River.
- World Cup Park: metasequoia and zelkova, plus the silver grass fields of Haneul Park.
Hill trails inside the city
The city lists Gwanaksan as one of Seoul's earliest spots to turn, and Bukhansan is close enough for a morning hike. For trails and gear rental, see our posts on hiking trails in Seoul and the Seoul Hiking Tourism Center.
Day trips
The Korea Tourism Organization's 2026 foliage page suggests Hwadam Botanic Garden, Nami Island and The Garden of Morning Calm near Seoul.
5. How to do Seoraksan from Seoul
Is it a realistic day trip?
Possible, but long. Express buses run to Sokcho from both Seoul Express Bus Terminal and Dong Seoul Terminal, according to the Korea Tourism Organization, and the IVisitKorea guide puts the ride at about 2.5 to 3 hours each way. Add the local bus and you're looking at 6 or more hours of travel. In peak week we'd stay a night in Sokcho and start the trail early.
Step by step
- Check the live photos the night before. Look at the KMA Gangwon foliage page and note which elevations are colored. That decides whether you aim high or stay in the valley.
- Book the bus. Express buses can be booked in English at kobus.co.kr, and intercity buses at txbus.t-money.co.kr or bustago.or.kr, per the tourism board. Some online bookings need to be confirmed or printed at the terminal.
- Take local bus 7 or 7-1 in Sokcho. From near the Sokcho Express Bus Terminal, these run to the Seoraksan entrance area (Sogongwon). Ride to the last stop, about 30 to 40 minutes.
- Choose a trail that fits your legs and the light. KNPS rates trails on five difficulty levels and asks hikers to choose by fitness, distance and time. A gentle option like the valley walk toward Biseondae suits a first visit. Ulsanbawi, the park's best-known rock, is rated advanced.
- Dress in layers and turn around early. Autumn temperatures swing, and the park service reminds hikers that days are getting shorter. Plan to be off the trail well before dark.
- Sort out your return seat before you hike. Booking the trip back in advance means one less thing to deal with at the end of a long day.
The park itself has no entrance fee, per IVisitKorea's September 2026 guide. The cable car is charged separately, and tickets are sold on the day.
6. Crowds, slippery leaves and staying safe
The numbers behind the warnings
National parks get much busier in autumn, and fallen leaves make paths slick. The park service counted 304 accidents in national parks over the past three years: 118 in 2024, 123 in 2025 and 63 through August 2026. Of those, 276 involved injuries and 28 were fatal. They're a good reason to take the "easy trail, early start" advice seriously.
Walking tips from the park service
Walk heel to toe on flat ground. On descents, keep your knees slightly bent, and zigzag down steep slopes instead of heading straight down. If you have a heart condition, take frequent breaks.
Our opinion on timing
If you can choose one thing, choose a weekday. The color is the same on a Wednesday; the queues for buses, the cable car and narrow trail sections are not. The 1330 Korea Travel Hotline (+82-2-1330) can help in English if plans change.
7. FAQ
When is the best time to see fall foliage in Seoul in 2026?
Late October to mid-November. KNPS and Seoul's city government put Bukhansan's peak around November 4, and downtown streets usually look best in early November.
When does Seoraksan peak in 2026?
KNPS forecasts October 25; the Forest Service's maple forecast says October 20. Aiming for October 20 to 25 is sensible, but check live photos first.
Why are there different peak dates for the same mountain?
The agencies use different thresholds. The KMA's peak means about 80 percent of the whole mountain has turned, while the Forest Service measures trees that are 50 percent colored. The 50 percent date comes first.
Conclusion
The short version for 2026: Gangwon's mountains through the last third of October, then Seoul from late October into November. Forecasts give you the week; live photos give you the day. Go midweek if you can, start early, and let the color's downhill march decide whether you climb or stay in the valley.
Sources
- The Hankyoreh: Korea National Park Service peak forecast and safety figures, Oct 16, 2026
- SBS News: Seoraksan and Odaesan foliage report, Oct 16, 2026
- Money Today: Korea Forest Service 2026 foliage peak forecast map (Korean), Sept 22, 2026
- Korea JoongAng Daily: Seoraksan first foliage, Sept 28, 2026
- Gyeonggi Province: National Arboretum peak search service (Korean), Oct 6, 2026
- VisitKorea: 2026 Fall Foliage Forecast (data: Weatheri Inc.)
- Seoul Metropolitan Government: 110 autumn-leaf roads in Seoul (Korean)
- Seoul city news: downtown foliage walk (Korean), Nov 2025
- VisitKorea: Express and intercity buses
- IVisitKorea: Seoraksan National Park guide (updated Sept 10, 2026)
- KMA Gangwon: live national park foliage photos (Korean)
All dates and figures are as of October 2026. Foliage forecasts change with the weather, so confirm conditions before you travel.
By the Korea Vibe Hopper team · Updated October 16, 2026