Ashibetsu-dake Hanmen-yama Winter Ridge

芦別岳半面山(冬尾根)

Posted on Mar 16, 2023
0
ES
Posted on Mar 16, 2023
0 0
ES
10km

Distance

6.5 hours

Time

1000m

Ascent

1377m

Highest point

7.5/10
Difficulty
Snow Icon | Hokkaido Wilds
Jan-Mar

Best season

GPX

KML

TOPO

GSI

Ashibetsu-dake 芦別岳 (1726m) is a serious alpine peak in the Yubari Range 夕張山地 near Furano City in central Hokkaido. It's a fine ski mountaineering objective, but it requires a good weather window to attempt. Hanmen-yama 半面山 (1377m) is a minor peak serving as an advance-guard of sorts - a necessary transit point for both this Winter Ridge route 冬尾根 and summer trail 夏道 on the way to the main prize. On stormy days, however, Hanmen-yama becomes a worthy objective in its own right, particularly via this winter ridge. There are a number of lappable slopes at the upper part of the route which hold snow well. If the weather is putting a damper on other larger objectives in the area, a walk up Hanmen-yama might be the antidote.

We visited this route on Feb 12, 2023

Last updated Dec 25, 2023

Topomap

Route Map

Need to know details

Location

Hanmen-yama sits just east of the summit of Ashibetsu-dake in the middle of the Yubari Range near Furano City in central Hokkaido. This route up the “Winter Ridge” 冬尾根, as it’s referred to some, starts at the entrance of the Karamatsu-rindo forestry road カラマツ沢林道 next to the Furano Recycling Center, on the eastern side of the range.

General notes

Ashibetsu-dake is somewhat of a unicorn in the mountains around Furano City. The summit facilitates access to some committing and challenging terrain. It’s a rare day, however, that the weather will allow a summit in deep winter. This winter ridge to the transit-peak that is Hanmen-yama, however, fills the gap when seeking a backcountry adventure when visibility or wind might preclude a summit attempt. In particular the slopes on the south side of the ridge, in the upper portion of the ridge, offer some great lappable terrain.

Hut
None
Route details

From the main road, skin about 800m west up the Karamatsu-rindo forestry road カラマツ沢林道. About 100m after the gate, at the hard left hairpin bend, continue westwards. You’ll walk along a very gently rising clearing in the plantation forest before gaining the ridge at around 460m. The ridge is compact and disturbingly bushy until around the 950m mark, where things finally open up considerably.

Keeping an eye on possible lappable zones on the climber’s left (south) as you climb, continue along the ridge. You may need to cut steep kickturns out on the southern slopes at times to effectively gain altitude – the ridge can be narrow in places. The summit of Hanmen-yama (1377m) comes all of a sudden. It’s a featureless summit, with no clear high point. There’s a summit sign, but you’ll have to search for it.

From Hanmen-yama, make the call to either continue on to the Ashibetsu-dake summit (see this post for details) or descend and make the most of the lappable terrain off the winter ridge towards Ichinosawa-gawa 一の沢川. The return to the trailhead is back along the ascent ridge.

Route Timing
Up | 5hrs
Down | 1hrs

The timing above applies to a leisurely, simple up-and-back mission in very deep mid-winter powder snow. It doesn’t take into account lapping terrain.

Transport

Public transport:

The JR Yamabe Station 山部駅 (location) is a 40 minute walk (3km) from the trailhead (see the route here). Yamabe Station is a 14-minute train ride from Furano Station.

By car:

The trailhead is a 20 minute (14km) drive from central Furano City via National Highway 38. There is no dedicated parking at the trailhead. Previously, skiers would typically park in a small cleared area at the entrance of Karamatsu-rindo forestry road (here), where there used to be room to park two cars at a pinch. For the past few years, however, the forestry road is in use even in winter for forestry. Therefore, there is no longer anywhere to park at the trailhead. We recommend skiers either arrange to get dropped off at the trailhead, take public transport (see above), or seek permission from forestry staff (in Japanese) before considering parking anywhere along the forestry road.

Physical maps
Official Topo Map: Ashibetsudake (芦別岳) – map no. NK-54-8-9-4

NOTE: The official 1/25000 topo map(s) above can be purchased for 350yen from Kinokuniya bookstore next to Sapporo Station or online (in Japanese).

Aspect
The main aspect skiers are exposed to on the descent and/or ascent is East. Other aspects that may also be encountered while following the route outlined on this page include: South. Therefore, keep an eye on the weather forecast a few days ahead of your trip to monitor wind, snow, and temperature. Also, since this route is in the general vicinity of the Furano area, consider looking at the Furano Avalanche Center (on Facebook). They issue sporadic observations throughout the season which may give extra insight into avalanche conditions.

Snow and
route safety

The slopes on the south side of the winter ridge all drop into a deep and narrow gully (the Ichi-no-sawa-gawa gully). This is a serious terrain trap where skiers would get buried very deep if caught in an avalanche. Ski with caution and be aware of what the snowpack is doing. If shooting for the Ashibetsu-dake summit, see this post for safety notes.

Ashibetsu-dake Hanmen-yama Winter Ridge Difficulty Rating

Category

Grade

Points

Strenuousness

Vertical Gain

A

40

Time ascending

B

6

Technicality

Altitude

A

10

Hazards

B

12

Navigation

C

6

Totals

74/100

GRADES range from A (very difficult) to D (easy).  More details here. Rating rubric adapted from Hokkaido Yukiyama Guidebook 北海道雪山ガイド.

Weather forecast

Windy.com weather forecast for Ashibetsu-dake Hanmen-yama
Onsen nearby

If there’s just one thing that the immediate Furano area lacks, it’s good natural onsen. Drive 40 minutes up to the Tokachi Onsen area, and you’ll be in heaven – our pick is Hakuginso’s massive outdoor onsen complex. But if you’re headed back to Furano, try out the pokey but cute Hotel Naturwald Furano ホテルナトゥールヴァルト富良野 (location, 600yen), right next to the Furano ski area.

Extra Resources

Guide Options

If you’d like to ski this route and/or explore other peaks in central Hokkaido together with a local certified guide, get in touch with Yasuko Kikuchi. Born and raised in Hokkaido, she’s a JMGA-certified guide now based in Sapporo. Her outdoor experience is broad and worldwide, having worked as a Canadian Ski Patrol member, and has sumitted a number of 6,000m+ peaks around the world. She speaks good English, and can arrange transport to and from central Hokkaido. In addition to Yasuko, also see a full list of English-speaking Hokkaido Mountain Guides Association (HMGA) guides on the HMGA website here

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Show Full Route Notes Close Route Notes

Route Trip Notes

The previous day, I’d been up at Ryounkaku in the Tokachi Range with Tim, Simon and Alex. It was a great day out with great weather. With that crew variously engaged today, and the weather decidedly worse, I was at somewhat a loose end. In my search for a suitable place to sleep in the van overnight in the Furano area, Tim suggested the Yamabe Parking area (location). With a 24hr heated toilet building, this was a perfect, albeit far-from-Furano solution (a 30 minute drive).

This location south of Furano City central more or less decided for me where I’d ski today. The Ashibetsu-dake winter ridge route was one I’d wanted to check out for a while. I was solo, but with a relatively safe ridge, and a conservative goal of just getting to Hanmen-yama, it seemed like a nice opportunity for a walk in the woods.

I arrived at the trailhead just as the sky was getting light. It was somewhat fortuitous that the normally snowed-in forestry road had been cleared all the way to the forestry road gate. I drove up, saving about 20 minutes of trail-breaking. It took a while to decided exactly where to park, though. Initially, I drove past the gate, and there was an area off the side of the road I could have parked. But I felt uneasy parking beyond the gate – what if someone closed it while I was out? Unlikely, but there was also an alternative spot to park off the road just outside the gate. I played it safe and parked just next to the gate.

I followed the road about 100m past the gate on skis, and then started trail breaking in earnest through the forest just beyond the hairpin bend. It was going to be slow going, as the snow was fresh and deep. Before long though, I found the ridge.

The ridge was narrower and more heavily wooded than I think I’d expected.

After about 2 hours of trail breaking along the ridge, seeing nothing but a bushy hell-scape on either side of the ridge, I messaged a friend.

“This route sucks!”

After about 3.5hrs though, things started to look much better. The ridge itself was still compact and narrow, but in particular the climber’s left side was looking much nicer, and even worth the initial bushy ridge approach.

I was about 4.5hrs into the trail-breaking slog when I stopped for a break. I sat down and donned my puffer jacket, and started munching on a packet of Oreos. I looked back at my skin track.

“I really hope someone else gets to make use of this track today,” I pondered. I felt like I’d put in a lot of work.

Just as I was thinking this, I noticed a party of three skiers making their way quickly up the skin track.

They caught up to me taking my break. It was three foreigners, apparently a guide with two clients.

“We were going to head up the summer trail ridge, but decided instead to make use of your skin track,” the guide-looking guy said. “So thanks for that!”

I told him I would let him take over for the final 200m of ascent, which he happily accepted. I was certainly the happier one.

“I don’t ski much up in here, but when we do, we usually ski the east-facing slope just south of Hanmen-yama,” he said. “Should be good today!”

After a couple of minutes of chatting, they carried on and left me to my Oreos.

With a skin track ahead of me now, it was a quick and easy climb for the final few hundred meters to the non-descript summit.

Sure enough, at the summit, I could see the skin track of the party in front of me, heading south along the ridge. The east slope looked steep on the topo, so I decided to give it a miss and head back the way I had come.

I ripped skins and was immediately amazed at the quality of the snow. I stayed on the ridge for a while before succumbing to temptation and dropped down the south slope off the ridge for some very high-quality turns until I was bluffed out above the gully.

As I was transitioning back to skins, I noticed the party of three skiing the very steep-looking eastern slope. It looked amazing.

The guide led the other two all the way to the gully floor.

For me, I had a deep climbing traverse of a skin back up to the main ridge. All around me were incredible-looking slopes perfect for lapping. If I’d had someone to share the trail-breaking with, we would have for sure lapped these slopes more. As it was, I was already over 5 hours in on this solo mission, so I decided to head back on the ridge.

The ridge-line skiing was better than my negativity on the ascent made me expect. There were a couple of good open pitches, and the tight trees were just plain fun.

I’d certainly got the best of the snow for the day. Back at the trailhead, the snow felt warm and heavy. I boiled up some water, had a coffee, ate a leisurely lunch, and then carried on my way.

Comments | Queries | Reports

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Ashibetsu-dake Hanmen-yama Winter Ridge Difficulty Rating

Category

Grade

Points

Strenuousness

Vertical Gain

A

40

Time ascending

B

6

Technicality

Altitude

A

10

Hazards

B

12

Navigation

C

6

Totals

74/100

GRADES range from A (very difficult) to D (easy). Hazards include exposure to avalanche and fall risk. More details here. Rating rubric adapted from Hokkaido Yukiyama Guidebook 北海道雪山ガイド.