Mount Hinokiboramaru, a 1601m Peak Representing Nishi-Tanzawa
Mount Hinokiboramaru lies in the western part of Tanzawa-Ōyama Quasi-National Park and is a serious hiking destination reached by following deep forests and steep ridges to its 1601m summit.
Unlike a short walk at a sightseeing spot, this climb requires planning and equipment for long ascents and descents, stream crossings, and changing weather.
Nishi-Tanzawa Visitor Center Serves as the Hiking Base
The main Tsutsuji Shindō route starts at Nishi-Tanzawa Visitor Center and heads to the summit via Gōrasawa Deai.
Before setting out, check the nature information and trail warnings inside the center or on its notice boards, submit a hiking plan, and then begin your walk.
A Round Trip of About 10km with About 1060m of Elevation Gain
The published route is approximately 10km round trip, with about 1060m of elevation gain and an estimated hiking time of around 6 hours.
This elevation difference is the gap between the starting point at Nishi-Tanzawa Visitor Center, around 540m above sea level, and the 1601m summit, showing that the ascent continues for a long time.
Because this time can increase due to breaks, congestion, stream crossings, photography, and differences in fitness, work backward from the last bus and sunset and add extra time.
Do Not Judge the Difficulty by the Numbers Alone
Even though the distance is about 10km, the elevation change is substantial and the footing varies through a long descent, so it cannot be judged like walking the same distance on level ground.
The table below summarizes the route’s basic figures and the main points to reflect in your plan.
| Item to Check | Route Guideline | How to Use It in Your Plan |
|---|---|---|
| Summit elevation | 1601m | Allow for temperature differences |
| Elevation difference | About 1060m | Prepare for ascents and descents |
| Round-trip distance | About 10km | Work backward from sunset |
| Estimated time | About 6 hours | Add time for breaks |
Tsutsuji Shindō Changes to a Steep Climb after Gōrasawa Deai
Tsutsuji Shindō is not simply a steady climb through the forest; its character changes from the approach to the stream and the crossing itself to a steep ridge ascent and boardwalks just below the summit.
Knowing the features of each section in advance makes it easier to pace yourself and decide when to turn back.
Walk Along the Road to the Trailhead
From Nishi-Tanzawa Visitor Center to the Tsutsuji Shindō trailhead, follow the roadside while watching for vehicles and the edge of the shoulder.
Compare your map, signs, and current location so that you do not miss the entrance and continue onto a different route.
Cross the Stream at Gōrasawa Deai
At Gōrasawa Deai, assess whether the stream can be crossed safely by checking the water level, wet rocks, and speed of the current.
Do not force a crossing when the water is high, and turn back if trail advisories or conditions on site leave you uncertain.
A Steep Ascent Continues beyond the Stream
After the crossing, the route gains considerable elevation, and steps, tree roots, and rocks can easily disrupt your stride.
When yielding to faster hikers, stop in a stable place and take a short break before you remain out of breath for too long.
Protect Vegetation on the Boardwalk below the Summit
Boardwalks have been installed in some higher areas, and staying on the designated path helps protect the vegetation and slopes.
When passing others, do not step far off the boardwalk; wait until you reach a point wide enough to let each other pass.
Observe Shiroyashio Azaleas and Beech Forests
Mount Hinokiboramaru is known for its shiroyashio azaleas, while Tōgoku mitsuba tsutsuji and yamatsutsuji azaleas can also be seen near the summit.
Flowering times vary with elevation, temperature, and each year’s weather, so do not fix a particular date as peak bloom; check the latest nature information.
5 Leaves Are Another Clue for Identifying Shiroyashio
Shiroyashio is known not only for its white flowers but also as goyōtsutsuji because its 5 leaves grow in a whorl-like arrangement.
Some shiroyashio trees near the summit are said to be 100–200 years old, and the distinctive branching of these old trees is another highlight.
Do not pull branches toward you or pick flowers; observe the tree forms and overlapping flowers and leaves from the trail.
Contrast with Tōgoku Mitsuba Tsutsuji
When purple-flowered Tōgoku mitsuba tsutsuji and white shiroyashio bloom near each other, compare not only their colors but also their height and branching.
Hikers tend to gather during flowering season, so do not block the trail to take photos or step onto slopes where there is a risk of falling.
Change What You Observe with the Seasons
After the fresh spring greenery come deep leafy shade, autumn foliage, and then bare branches and snow in winter, so the focus of observation changes along the same trail.
Winter, however, requires specialized preparation for snow and ice, and it is important not to enter the mountain based only on experience from snow-free seasons.
The table below separates seasonal observations from their key safety concerns.
| Seasonal Focus | What to Observe | Safety Check |
|---|---|---|
| Spring to early summer | Azaleas and fresh greenery | Crowds and flowering information |
| Summer | Forest and wildflowers | Heat and thunderstorms |
| Autumn | Autumn colors and fallen leaves | Sunset and wet leaves |
| Winter | Snow and views through the branches | Ice and winter-mountain gear |
Prevent Falls and Getting Lost on the Descent
On the Mount Hinokiboramaru route, many mountain accidents are said to result from falls during the descent.
Treat reaching the summit as the halfway point and plan to preserve leg strength, concentration, and drinking water for the way down.
Take Smaller Steps on Steep Descents
Do not drop down steps all at once; choose places where you can plant your whole foot and avoid suddenly putting your weight on wet roots or loose rocks.
Keep your distance from the person ahead, and if you dislodge a rock, warn those around you in a loud voice.
Refuel before Fatigue Sets In
Take small amounts of water and trail food regularly before hunger or dehydration impairs your judgment.
If your legs begin to shake or you feel unsteady, slow down and rest in a stable place; do not run recklessly just to catch the last transportation service.
Repeatedly Check Junctions and Your Current Location
Do not rely on signs alone; carry a topographic or hiking map and a backup power source, and confirm your direction at every junction.
If fog or rain reduces visibility, return safely to the point where you noticed the mistake, and do not use a stream or slope as a shortcut downhill.
Choose Equipment for the Weather, Stream Crossing, and Snow
On Mount Hinokiboramaru, temperature and wind differ between the trailhead and summit, and stream conditions also change with rainfall.
Prioritize being prepared and willing to turn back according to the day’s conditions over reaching the summit as planned.
Carry Your Own Essential Equipment
Bring hiking boots, rain gear, warm clothing, drinking water, trail food, a map, a light, first-aid supplies, and a backup power source, and confirm how to use them before departure.
Do not assume that you can obtain supplies from a mountain hut or other hikers; carry the amount required for your own itinerary.
Check for Rising Stream Levels and Thunderstorms
Even when rain is light on the mountain, precipitation upstream may change the water level, so include the weather through the previous day in your assessment.
If thunderstorms or strong winds are forecast, reconsider setting out, and switch to an early descent if you sense danger on the trail.
Treat the Snow Season as Winter Mountaineering
Carry traction equipment for snow and ice, and stay alert to conditions that change by time and location.
Winter requires snow-mountain equipment, skills, and experience, so check the latest snow records and trail information and do not enter if conditions exceed your ability.
Use Public Transportation and the Visitor Center
One recommended way to reach the Tsutsuji Shindō starting point is to take a bus bound for Nishi-Tanzawa from Shin-Matsuda Station on the Odakyu Line and get off at Nishi-Tanzawa Visitor Center.
Because transportation in mountain areas is strongly affected by limited service and schedules, check the return bus before planning the outbound trip.
Check the Bus Schedule for the Day of Your Visit
Service conditions may vary by season and day of the week, so use the transportation operator’s timetable rather than an old hiking report.
Allow for the possibility that crowded buses may prevent you from boarding your intended service, and set an earlier option and an alternative time to end your hike.
Review Trail Access Information Just before Departure
Trail closures and advisories are published, so check them 2 times: when planning and immediately before departure.
Read the update date and affected section, and do not apply information about a different trail to Tsutsuji Shindō.
Share Your Hiking Plan with Family
Tell family or friends your route, departure time, expected descent time, and emergency contact information in addition to submitting a hiking registration.
Assume that some areas will have no signal and decide in advance when you will contact them if your plans change.
The table below organizes the information to check before departure.
| Source | Main Information | When to Check |
|---|---|---|
| Kanagawa Prefecture | Trail access information | During planning and just before departure |
| Visitor center | Nature and trail conditions | Just before departure and on the day |
| Transportation operator | Bus schedule | Day of visit |
| Weather information | Rain, wind, and thunderstorms | Previous day and day of visit |
Summary | Climb Mount Hinokiboramaru with the Descent in Mind
The Tsutsuji Shindō route on Mount Hinokiboramaru combines the stream crossing at Gōrasawa Deai, a steep ascent of about 1060m, boardwalks just below the summit, and shiroyashio forests in a single hike.
Add breaks and time for unexpected delays to the guideline of about 10km round trip and roughly 6 hours, and preserve the strength and concentration needed to avoid falls during the descent.
Check trail conditions, stream levels, weather, snow, and bus schedules through the relevant information sources, and change your plan safely without insisting on the summit when conditions are unsuitable.
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