Sanso-Ishimuro

山荘石室

2,832 m · Kiso, Nagano · 0.7 km from the summit of Mount Ontake

A staffed lodge at 2,820 m on the ninth station of the Kurosawaguchi route up Mount Ontake in Kiso, Nagano. It lies directly on the trail toward the summit and is an overnight base for routes around Kengamine and Ninoike. Guests can experience sunrise, stars and alpine plants, and the building is also a designated volcanic evacuation facility.

2026: open July 1–October 5 · reservation required · sleeps 60

Website: www.ontake-ishimuro.com ／ Phone 090-8873-9761

Prices (2026)

1 night with dinner and breakfast: ¥13,000
1 night with dinner: ¥11,000
1 night with breakfast: ¥9,000
Room only, no meals: ¥7,500

Sanso-Ishimuro weather (hourly, 14 days)

Sunrise today 06:14, sunset 16:54

		Tue, 11/3		Wed, 11/4											Thu, 11/5								Fri, 11/6								Sat, 11/7								Sun, 11/8								Mon, 11/9							Tue, 11/10				Wed, 11/11				Thu, 11/12				Fri, 11/13				Sat, 11/14				Sun, 11/15				Mon, 11/16				Tue, 11/17
Japan time		21	23	1	3	5	7	9	11	13	15	17	19	21	0	3	6	9	12	15	18	21	0	3	6	9	12	15	18	21	0	3	6	9	12	15	18	21	0	3	6	9	12	15	18	21	0	3	6	9	12	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21

Temperature	°C	-6°	-5°	-5°	-6°	-6°	-5°	2°	4°	5°	3°	1°	1°	0°	-1°	-1°	0°	3°	5°	6°	2°	1°	1°	1°	0°	2°	5°	2°	-3°	-4°	-5°	-6°	-8°	-6°	-5°	-6°	-9°	-10°	-11°	-11°	-12°	-2°	1°	-1°	-6°	-5°	-4°	-3°	-3°	-2°	3°	1°	-8°	-10°	-3°	-2°	-6°	-9°	-9°	-6°	-12°	-10°	-3°	-2°	-9°	-7°	-5°	-4°	-12°	-8°	-3°	-1°	-6°	-5°	0°	0°	0°	0°	2°	0°	-7°	-10°	-2°	-1°	-3°
Precipitation	mm													0.1	4.7	3.5	2.3	0.5				0.2	0.2	8	1.4		0.2		0.2	0.2					0.2	0.1												0.5	0.9	0.1						0.4	1.6	0.9	0.3																	1.1	15	12	1.8	1.7	0.2			0.1	0.2
New snow	cm											–	–																			<.1			0.2	<.1															–						0.3	0.6	0.3	<.1								<.1
Snow depth	cm	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	<1	<1	<1	<1	<1	<1	<1	<1	<1	<1	<1	<1	<1	<1	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Wind	m/s	0	0	0	0	0	0	1	2	3	1	0	1	1	1	1	1	0	2	1	1	2	2	3	2	2	4	4	2	1	2	2	2	3	4	4	3	2	2	2	1	1	2	1	1	1	1	1	1	1	3	2	0	0	2	4	3	3	6	5	1	0	3	2	0	1	4	3	1	1	1	2	0	0	3	2	3	1	2	5	2	1	1	2	2
Wind gusts	m/s	4	4	4	4	4	4	6	8	10	10	7	6	7	8	11	10	7	9	9	7	9	12	14	13	11	13	14	13	9	10	11	11	13	16	17	16	14	12	11	11	8	8	8	6	7	10	10	9	9	11	12	7	6	9	15	13	15	25	23	18	6	10	11	7	8	14	16	14	7	5	10	8	7	11	13	15	16	10	19	19	12	5	9	9
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