Onioshidashi Park
Open by month
Open in January. No seasonal closure recorded.
Open in February. No seasonal closure recorded.
Open in March. No seasonal closure recorded.
Open in April. No seasonal closure recorded.
Open in May — at its best. Alpine flowers such as iwakagami and azaleas bloom among the lava from around May.
Open in June. No seasonal closure recorded.
Open in July. No seasonal closure recorded.
Open in August. No seasonal closure recorded.
Open in September. No seasonal closure recorded.
Open in October. No seasonal closure recorded.
Open in November. No seasonal closure recorded.
Open in December. No seasonal closure recorded.
Checked against the official site on 2026-10-19.
A field of jagged lava left by Mount Asama's great eruption of 1783. Paths wind between the rocks with the volcano behind, and alpine flowers bloom among them from around May.
Nearby
- Shiraito Falls (Karuizawa) ≈ 20 min by car
- Kumoba Pond ≈ 35 min by car
- Kyu-Karuizawa Ginza Street ≈ 35 min by car
- Akaiwa District (Kuni, Nakanojo) ≈ 45 min by car
- Komoro Castle Ruins (Kaikoen) ≈ 45 min by car
Travel times are rough estimates by car.
- Best time
- May — Alpine flowers such as iwakagami and azaleas bloom among the lava from around May
- Getting there
- About 40 min by bus from Karuizawa Sta. (Hokuriku Shinkansen); about 30 min by bus from Naka-Karuizawa Sta.
- Fee
- Adults (junior high and up) ¥700, elementary ¥500
- Good to know
- 8:00–17:00 (last entry 16:30), open all year; hours may change by season
- Time needed
- 1 h
Checked against the official Japanese website on 2026-10-19. Report outdated info