Mt. Akaiwa
赤岩岳
Ōmachi-shi, Nagano · Elevation 2,769 m
Mt. Akaiwa is a 2,768.7 m peak on the main ridge of the southern Hida Mountains (Northern Alps), on the boundary of Ōmachi and Matsumoto Cities in Nagano Prefecture. It sits between Daitenjō-dake and Nishi-dake along the Omote-Ginza traverse (Higashi-kama Ridge), with a third-order triangulation point named "Fudenami" on top. Within Chūbu Sangaku National Park, the maintained trail bypasses the summit along the eastern flank, so reaching the peak proper is a side excursion for the curious. Listed among Japan's Hyaku-kōzan.
Mt. Akaiwa at a glance
- Weather: The most settled day in the next 7 days is Wed, November 4: clear, gusts up to 9 m/s. Thu, Nov 5, Fri, Nov 6, Sat, Nov 7: strong wind (gusts up to 20 m/s).
Mt. Akaiwa weather (hourly, 14 days)
Sunrise today 06:13, sunset 16:52
| 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 | 15 | 17 | 19 | 21 | 23 | 1 | 3 | 5 | 7 | 9 | 11 | 13 | 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 | 18 | 21 | 0 | 3 | 6 | 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 | 3 | 9 | 15 | |
| Temperature | °C | 0° | -5° | -7° | -7° | -6° | -6° | -4° | -4° | -3° | 1° | 3° | 4° | 3° | 0° | 0° | 0° | 0° | 1° | 2° | 4° | 6° | 2° | 2° | 1° | 1° | 1° | 1° | 1° | 0° | -3° | -6° | -7° | -9° | -9° | -9° | -9° | -9° | -12° | -13° | -12° | -12° | -11° | -3° | -1° | -3° | -7° | -6° | -6° | -6° | -6° | -4° | -3° | -11° | -12° | -4° | -4° | -6° | -12° | -9° | -7° | -11° | -10° | -3° | -3° | -10° | -6° | -5° | -4° | -9° | -7° | 0° | 0° | -7° | -6° | 0° | -1° | -1° | -1° | 1° | -2° | -7° | -6° | -2° | -2° |
| Precipitation | mm | 0.1 | 2.4 | 10 | 9 | 6 | 0.7 | 0.3 | 2.6 | 3.3 | 0.8 | 0.7 | 0.5 | 0.2 | 1.3 | 1.6 | 1.8 | 1.7 | 0.8 | 0.2 | 0.1 | 0.9 | 1.1 | 0.2 | 0.7 | 3.0 | 6 | 3.6 | 0.3 | 0.9 | 1.5 | 1.1 | 10 | 10 | 3.4 | 1.4 | 0.7 | ||||||||||||||||||||||||||||||||||||||||||||||||
| New snow | cm | 0.1 | 0.2 | 0.1 | 0.1 | 1.2 | 1.6 | 1.8 | 1.6 | 0.8 | 0.2 | <.1 | <.1 | <.1 | 0.1 | 0.8 | 0.9 | 0.1 | 0.7 | <.1 | 2.9 | 6.0 | 3.6 | 0.3 | 0.8 | 1.0 | <.1 | <.1 | 0.3 | 0.4 | 0.6 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 | 1 | 2 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 6 | 5 | 5 | 5 | 5 | 5 | 7 | 12 | 14 | 14 | 13 | 13 | 12 | 12 | 11 | 12 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 10 | 8 | 7 | 6 | 4 | 4 | 4 | 4 | 4 | 4 |
| Wind | m/s | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 3 | 3 | 3 | 1 | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 3 | 3 | 3 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | 2 | 2 | 1 | 1 | 1 | 2 | 4 | 3 | 7 | 3 | 2 | 1 | 1 | 2 | 1 | 1 | 3 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 1 | 4 | 3 | 2 | 3 | 1 | 0 | 1 | 2 |
| Wind gusts | m/s | 10 | 9 | 8 | 8 | 8 | 7 | 6 | 6 | 6 | 7 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 13 | 15 | 14 | 12 | 10 | 11 | 12 | 13 | 15 | 17 | 17 | 16 | 16 | 17 | 18 | 19 | 19 | 20 | 19 | 16 | 16 | 15 | 14 | 14 | 11 | 9 | 9 | 9 | 10 | 12 | 14 | 14 | 12 | 12 | 8 | 6 | 8 | 15 | 14 | 27 | 29 | 18 | 10 | 7 | 9 | 10 | 8 | 13 | 13 | 12 | 10 | 9 | 7 | 7 | 7 | 8 | 10 | 13 | 17 | 17 | 15 | 16 | 14 | 8 | 5 | 8 |
| Wind dir. | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | ↓ | |
Huts, campsites and lodging near Mt. Akaiwa
Mountain huts
- Hutte Nishidake 2026: open July 10–October 11 · reservation required · sleeps 38
- Otenjo Hutte 2026: open July 11–October 11 · reservation required · sleeps 70
- 赤沢岩小屋
- Hutte Oyari 2026: open July 1–October 12 · reservation required · sleeps 96
- Yarisawa Lodge 2026: open April 27–November 3 · reservation required · sleeps 100
Campsites
- Babadaira Camp Site
- 殺生ヒュッテテント場
- 南岳小屋テント場
Lists that include Mt. Akaiwa
Japan's 100 Highest Mountains · Elevations of 1003 Mountains of Japan
Mt. Akaiwa facts
- Elevation
- 2,769 m
- Location
- Ōmachi-shi, Nagano
36.343346, 137.684054 - National Park
- 中部山岳国立公園
- Website
- www.yarigatake.co.jp
- Trail Map
- azumino-e-tabi.net
- Access Information
- azumino-e-tabi.net