Yilan's mountains aren't tall. This makes them easy to overlook, yet it's also their greatest strength.
From the coastal Guishan Island (262 meters) to the Nan'ao North Creek Valley near Nan'ao Harbor, Yilan's mountain trails span not vertical elevation, but seasonal and weather transformations. The same trail in spring means rhododendron flower seas, while in autumn and winter it becomes mountaintops floating above sea of clouds. This versatility makes Yilan a region where both hiking beginners and experienced hikers can find suitable routes—and more importantly—you can rediscover the same mountain in different seasons within a single year.
Difficulty Rating System: Find Your Pace
The most practical way to categorize Yilan's trails isn't by elevation, but by difficulty and physical intensity. The hiking experience here is completely different from Taipei's volcanic geothermal terrain—it's more akin to gentle forest healing and hydrological landscapes.
Beginner Trails (Weekend easy walks, suitable for seniors and children): The Sacred Mother Mountain Trail offers the most well-developed hiking entrance facilities. Located next to the Sacred Mother Mountain Lodge, the full trail is 3.8 km with an elevation of approximately 490 meters, taking about 2 hours round trip. The trail's endpoint offers 360-degree views overlooking the Lanyang Plain and the Pacific coastline. On sunny winter days, you can even spot Guishan Island in the distance. The trailhead has parking and restrooms, but it gets very crowded on weekends, with admission at NT$50 per person.
The Five Peaks Flag Waterfall Trail is another beginner option, located near the Jiaoxi Hot Spring area, a 15-minute walk from hot spring hotels. The full trail is 2.5 km with three tiers of waterfall scenery, making it especially worthwhile during water-abundant seasons (spring and summer). What makes this place unique is that you can enjoy hot spring bathing right after hiking—this is how many locals use it for recreation. The wheelchair-accessible ramp is incomplete, but there's a small visitor center near the trailhead providing basic information.
Intermediate Trails (Hiking experience required, no ropes or rock climbing skills needed): Candlestick Twin Peaks is the top choice for autumn and winter hikers. About a 30-minute drive from Yilan City toward Nan'ao, with an elevation of approximately 880 meters, the trailhead environment is tranquil with few tourists. The full trail is approximately 4.5 km; the difficulty lies in the steep path and mostly rocky tread, but trail markers are clear. From October through March, Candlestick Twin Peaks is often shrouded in sea of clouds—standing at the peak gives a dreamy sensation of being amidst the clouds. Due to the low foot traffic, this area retains a more primitive hiking experience.
The Nan'ao Old Trail is an advanced hiker's choice, spanning approximately 6 km and taking 4 to 5 hours. The old trail follows the Nan'ao North Creek upward, passing through several rapids and waterfalls. During summer when water volume is high, river-crossing skills are needed; in autumn and winter when water is lower, it's easier to navigate. The old trail preserves traces from the Japanese occupation period, with人工stone steps and flood prevention waterworks—making this a must-visit historical route for Taiwan old trail enthusiasts.
Advanced Trail is the Guishan Island Circular Trail. This isn't traditional forest hiking, but an experience of maritime volcanic geology. The entire Guishan Island is a volcanic geological relic, with the peak at 401 meters; difficulty lies in the steepness and exposure. Circling the island takes over 6 hours, and island landing permit purchase is required (NT$100). There are many weather restrictions; in winter (December to March), the island is often closed due to sea conditions. Only 500 people are allowed to land daily, and online reservation must be made 7 days in advance.
Practical Guide for Seasonal Choices
Spring (March-May): Rhododendrons are in full bloom, but mountain trails are prone to rain with poor visibility. Beginner trails are most suitable; it's recommended to climb in the afternoon to avoid morning fog.
Summer (June-August): High temperatures and many mosquitoes. Long hikes are not recommended, but the Five Peaks Flag Waterfall has the most spectacular water flow—it's recommended to set out at 5 AM and descend before 8 AM.
Autumn (September-November): Most stable weather with best visibility. Golden season for intermediate and above trails; hiking plans can be arranged at any time.
Winter (December-February): Sea of clouds and fog scenes are most common, cold in the morning but mild during the day. Suitable for Candlestick Twin Peaks and Nan'ao Old Trail, with the least number of visitors.
Practical Information
Transportation: Rent a scooter or drive from Yilan Station. Every trailhead has parking (mostly free), but may be full on weekends—it's recommended to set out early or choose weekdays. Public transport is sparse, so self-driving or renting a scooter is the most practical choice.
Cost Range: Most trails are free. Sacred Mother Mountain Trail is NT$50 per person, Guishan Island landing is NT$100 per person. Parking is usually free.
Best Season: Autumn and winter (September to February), followed by spring (March to April).
Key Reminders: Five Peaks Flag and Sacred Mother Mountain trails get very crowded on weekends—it's recommended to set out on weekdays. Guishan Island requires online reservation 7 days in advance; check weather forecasts and sea condition announcements before landing. For Nan'ao Old Trail, it's best to join a local guide to prevent getting lost or river-crossing accidents. Check the Yilan County Government Mountain Trail website for real-time trail conditions before hiking. Accessibility: Some sections of the main Sacred Mother Mountain Trail have ramps; most other trails are primitive mountain paths—wheelchair users should consult hiking associations.
