Why Korea takes hiking seriously
Around 70% of South Korea is mountainous, and hiking is a genuinely mainstream weekend activity here, not a niche hobby — you'll see everyone from college students to retirees in full technical gear on a Saturday morning. The upside for visitors: trailheads are almost always reachable by public transit from a major city, trails are well-marked and well-maintained, and entrance to Korea's national parks has been free since 2007, when the government scrapped the old admission-fee system nationwide. (A few individual attractions inside park boundaries, like cable cars, still charge separately.)
Below are the three national parks most worth a visitor's time, in order of accessibility.
Bukhansan: Seoul's own mountain
Bukhansan National Park straddles the northern edge of Seoul and neighboring Gyeonggi-do, which makes it one of the only national parks in the world reachable directly by subway from a capital city — and one of the most heavily visited as a result, especially on weekends.
Getting there: Take Seoul Subway Line 3 to Gupabal Station, exit 1. From the bus stop just outside, take bus 704 (or 34/8772) to the Bukhansanseong stop, about 17 minutes. From there it's a short walk to the Bukhansanseong park entrance and information center. Total travel time from central Seoul is roughly an hour.
Signature route: Baegundae Peak (836.5m), the park's highest point, is the classic goal. Counting the approach from the Bukhansanseong entrance, round trip runs roughly 7–8km and takes most hikers 4–5 hours with breaks. The final stretch up to the summit is steep rock scramble aided by fixed ropes and chains — rated intermediate-to-advanced by park staff — but the exposure is short and the view over Seoul from the top is the payoff.
Practical tip: Bring gloves for the rope sections near the summit, even in summer — the rock gets polished and slick from decades of hands and feet. Trailheads also close before dusk, so start early rather than aiming for a late-afternoon summit.
Seoraksan: the dramatic one
Seoraksan National Park, on the northeast coast in Gangwon, is Korea's most scenic range — jagged granite peaks, deep valleys, and the country's most famous autumn foliage, which typically peaks in mid-to-late October.
Getting there: Buses run from Seoul Express Bus Terminal (Banpo-dong, Seocho-gu) to Sokcho, departing roughly every 30–60 minutes from 6:30am to 11:30pm. The ride takes about 4 hours and costs around ₩12,800–20,700 (roughly $9–15). From Sokcho Express Bus Terminal, local bus 7 or 7-1 runs to Seorak-dong (Outer Seorak, the main park entrance) in about 30 minutes for around ₩1,000 (~$0.70); a taxi covers the same stretch in about 20 minutes.
Signature route: Ulsanbawi, a dramatic exposed granite ridge, is the most popular day hike — about 3.8km one-way from the Sogongwon trailhead, elevation 874m, with a steep final push up several hundred steel stairs. Budget 4–5 hours round trip. Hikers after a bigger objective can aim for Daecheongbong (1,708m), the park's highest peak and the third-highest in South Korea — around 16km round trip from Sogongwon, and a genuine full-day undertaking.
Practical tip: If you're attempting Daecheongbong, start before dawn and check in advance whether you need to book a mountain shelter — overnight huts on the longer routes require reservations through the Korea National Park Service's website and fill up fast in October. The standard Ulsanbawi day hike needs no reservation.
Jirisan: the biggest
Jirisan National Park spans three provinces (Jeollabuk-do, Jeollanam-do, and Gyeongsangnam-do) and is Korea's largest national park by area on the mainland, as well as its first, designated in 1967. It's built around one enormous ridge rather than a single peak, and serious hikers come specifically for the multi-day traverse.
Getting there: The most direct option is KTX from Seoul Station to Gurye-gu Station (about 2.5 hours), then a short local bus (~10 minutes, ₩1,000–1,500) into Gurye Bus Terminal, where onward buses run to trailhead areas like Seongsamjae (for Nogodan) or Jungsan-ri. A direct intercity bus from Seoul's Nambu Bus Terminal to Gurye takes roughly 3.5–4 hours.
Signature route: The full ridge traverse from Nogodan (1,507m) to Cheonwangbong (1,915m, the highest peak on mainland South Korea) is Korea's longest ridge hike, commonly cited at around 25–30km depending on the exact endpoints used. Most hikers spread it over 2–3 days, overnighting at mountain shelters along the way. For a single day, the shorter Nogodan course from Seongsamjae rest area is a much more manageable option, since Seongsamjae itself already sits above 1,000m.
Practical tip: Shelters along the main ridge require advance online reservation through the Korea National Park Service and sell out well ahead during autumn foliage season and summer weekends — book before you travel, not after you arrive. The ridge is fully exposed in long stretches, so check the forecast closely; weather changes fast at this elevation.
The stamp-passport habit
Beyond the big three, Korea's national park system runs a long-running stamp tour passport program: pick up a free booklet at any participating park's visitor center, and get it stamped at trailhead and visitor facilities as you go (there are roughly 90+ stamp stations across 21 parks, Hallasan excluded). Collect ten stamps and you can mail in for a patch or medal. It's a low-key way frequent visitors track which parks they've covered — worth knowing about if you plan to hike more than once, though it's unrelated to the separate certification-stamp system used on Korea's cycling paths.