Mount Akagi & Lake Onuma
Open by month
Open in January. No seasonal closure recorded. New Year (Dec 29 – Jan 3): open.
Open in February. No seasonal closure recorded.
Open in March. No seasonal closure recorded.
Open in April. No seasonal closure recorded.
Open in May. No seasonal closure recorded.
Open in June — at its best.
Open in July. No seasonal closure recorded.
Open in August. No seasonal closure recorded.
Open in September. No seasonal closure recorded.
Open in October — at its best.
Open in November. No seasonal closure recorded.
Open in December. No seasonal closure recorded. New Year (Dec 29 – Jan 3): open.
Checked against the official site on 2026-10-12.
One of Gunma's three famous peaks, with a caldera lake ringed by forest, a lakeside shrine and huge azalea fields in early summer.
100 Famous Japanese Mountains
Nearby
- Fukiware Falls ≈ 45 min by car
- Iwajuku Archaeological Site ≈ 45 min by car
- Kiryu Shinmachi Historic District ≈ 50 min by car
- Mizusawa Kannon (Mizusawa Temple) ≈ 55 min by car
- Ikaho Onsen Stone Steps ≈ 1 h by car
Travel times are rough estimates by car.
- Best time
- June, October
- Getting there
- Kan-Etsu bus from JR Maebashi Station to Akagi Hiroba-mae, about 85 min (60 min direct on weekends)
Few buses — check times or join a tour - Fee
- Free
- Good to know
- About 4 buses a day on weekdays; a 90-min path loops the lake; ice fishing for smelt in winter
- Time needed
- 2 h 30 min
Checked against the official Japanese website on 2026-10-12. Report outdated info