Things to Do in Jeju in October
October weather, activities, events & insider tips
October Weather in Jeju
Is October Right for You?
Advantages
- Peak autumn foliage season - the volcanic slopes turn brilliant shades of orange and gold, particularly stunning around Hallasan National Park and the Bijarim Forest. Mid-to-late October is when the colors hit their peak, and the contrast against the black volcanic rock is genuinely spectacular.
- Comfortable hiking weather with daytime temperatures around 22°C (72°F) - warm enough that you won't freeze on the summit of Hallasan at 1,947 m (6,388 ft), but cool enough that you won't be drenched in sweat halfway up. The reduced humidity compared to summer makes those long coastal walks actually pleasant.
- Post-typhoon season pricing drops - by October, the September typhoon risk has largely passed, but accommodation rates haven't yet hit the winter premium levels. You're looking at 20-30% lower hotel rates compared to peak summer, and domestic Korean tourists thin out considerably after Chuseok holiday.
- Mandarin harvest season brings the island's signature crop to its sweetest point. Roadside stalls sell fresh-picked mandarins for ₩5,000-10,000 (around USD 4-8) per large bag, and you'll find mandarin-everything at markets - from fresh juice to hallabong chocolate to mandarin makgeolli.
Considerations
- Unpredictable rain patterns - those 10 rainy days don't follow a neat schedule, and October showers can be surprisingly heavy when they hit. Unlike summer's predictable afternoon storms, October rain might last several hours or even a full day, which can derail outdoor plans without indoor backup options.
- Wind picks up significantly in October, particularly on the coast and at higher elevations. Hallasan summit winds can hit 40-50 km/h (25-31 mph) on average days, making the temperature feel closer to 10°C (50°F) even when it's technically mild. Coastal walks and beach activities get genuinely uncomfortable on windier days.
- Shorter daylight hours mean less exploration time - sunset drops from around 6:30 PM in early October to 5:45 PM by month's end. If you're trying to pack in multiple sites, you'll find yourself racing against darkness, and many hiking trails close earlier than summer months for safety reasons.
Best Activities in October
Hallasan Mountain hiking trails
October is arguably the single best month to tackle Hallasan, South Korea's highest peak at 1,947 m (6,388 ft). The autumn foliage creates a gradient effect as you climb - subtropical plants at the base transitioning to alpine vegetation near the crater. The cooler temperatures mean you can actually reach the summit without feeling like you're melting, and the reduced humidity gives you clearer views across the island and toward mainland Korea on good days. The Seongpanak and Gwaneumsa trails are both open, taking 8-9 hours round trip. Start early - trailheads close to new hikers by 12:30 PM in October due to shorter daylight.
Udo Island cycling routes
This small island off Jeju's northeast coast is perfect for October cycling. The 17 km (10.6 mile) coastal loop takes 2-3 hours at a leisurely pace, and the October weather is ideal - cool enough that you won't overheat, but warm enough that coastal winds feel refreshing rather than punishing. The peanut fields are being harvested in October, and you'll see farmers working the distinctive red volcanic soil. The famous peanut ice cream tastes better when you've actually seen where the peanuts come from. Ferry from Seongsan Port takes 15 minutes and runs every 30 minutes.
Seongsan Ilchulbong sunrise hikes
This UNESCO volcanic crater is technically hikeable year-round, but October offers a sweet spot - you're not competing with peak summer crowds, the stairs aren't slippery from humidity, and sunrise happens at a reasonable 6:20-6:40 AM rather than the brutal 5:30 AM summer timing. The 182 m (597 ft) climb takes 20-30 minutes up 600+ steps. October's clearer air means better chances of actually seeing the sunrise without haze, and the surrounding fields show autumn colors. The view across to Udo Island and the haenyeo (women divers) working below is spectacular in morning light.
Jeju Olle Trail coastal walking routes
The Olle Trail network covers 425 km (264 miles) across 26 routes, and October is when serious hikers tackle the coastal sections. Routes 1, 7, and 10 are particularly stunning in autumn. The temperatures make 15-20 km (9-12 mile) day hikes actually enjoyable rather than endurance tests. You'll walk through silver grass fields that turn golden in October, past black volcanic cliffs, and through fishing villages where locals are drying anchovies and preparing for winter. The trail is well-marked with blue and orange ribbons, and each route takes 4-7 hours depending on your pace.
Manjanggul Lava Tube exploration
October is actually ideal for visiting this 7.4 km (4.6 mile) lava tube system, one of the longest in the world. When it's warm and humid outside, the cave's constant 11-21°C (52-70°F) temperature feels refreshingly cool rather than bone-chilling like it does in winter. Only 1 km (0.6 miles) is open to visitors, taking about 45 minutes to walk through. The lava formations and the 7.6 m (25 ft) tall lava column are genuinely impressive, and October's moderate outside temperatures mean you won't get that shocking temperature contrast when you emerge.
Seongeup Folk Village cultural walks
This preserved traditional village shows how Jeju islanders lived before modernization. October is perfect for wandering the stone-walled pathways and thatched-roof houses without summer's oppressive heat or winter's biting wind. The village sits at the foot of Hallasan, and in October you get the autumn foliage backdrop. You'll see traditional stone grandfather statues, black pigs in their pens, and elderly residents still living in some of the homes. The village is living history rather than a museum recreation, which makes it more interesting but also means respecting that actual people live here.
October Events & Festivals
Jeju Olle Walking Festival
This multi-day festival typically happens in late October and brings together hikers from across Korea and internationally to walk various Olle Trail routes together. It's not just walking - there are cultural performances, local food stalls, and evening events at base camps. The atmosphere is surprisingly festive for a hiking event, and it's a great way to meet other travelers and locals. Registration usually opens in August and routes fill up, so if you're interested, plan ahead.
Jeju Mandarin Festival
Celebrating the island's most famous crop, this festival in mid-October features mandarin picking experiences, cooking demonstrations using mandarins, and markets selling every mandarin product imaginable. It's held in various locations across the island's mandarin-growing regions, particularly around Seogwipo. You can actually go into the orchards and pick your own fruit, which sounds touristy but is genuinely fun and the fresh-picked mandarins taste noticeably better than store-bought.