Season by season
Spring. Snow lingers into April. Fresh green and azaleas arrive from mid-May to June, when Ryuzu Falls is at its prettiest.
Summer. Daytime highs of around 20–23°C make the lake a classic escape from Tokyo’s heat. Cotton grass and wildflowers bloom on Senjogahara.
Autumn. The season moves downhill: Yumoto and Senjogahara in early October, Ryuzu Falls about the same time, Lake Chuzenji and Kegon Falls in mid to late October, and the Irohazaka slopes from late October to early November.
Winter. Deep cold, snow and blue skies. Kegon Falls is fringed with ice, and Yumoto holds a small snow festival in midwinter.
Autumn leaves by spot
| Spot | Typical peak |
|---|---|
| Yumoto Onsen, Lake Yunoko | early Oct |
| Senjogahara, Ryuzu Falls | early–mid Oct |
| Lake Chuzenji, Kegon Falls | mid–late Oct |
| Akechidaira, Irohazaka | late Oct–early Nov |
Crowds
October weekends are extremely busy. Visit midweek, start before 8:00, or stay up at the lake. July and August are lively but manageable; from December to March you may have the falls almost to yourself.
Oku-Nikko month by month
| Month | Avg high | Avg low | Visit rating |
|---|---|---|---|
| January | -1°C | -8°C | ★☆☆ Quiet / limited |
| February | 0°C | -8°C | ★☆☆ Quiet / limited |
| March | 3°C | -5°C | ★☆☆ Quiet / limited |
| April | 9°C | 0°C | ★☆☆ Quiet / limited |
| May | 15°C | 5°C | ★★☆ Good time |
| June | 18°C | 10°C | ★★☆ Good time |
| July | 22°C | 15°C | ★★★ Peak season |
| August | 23°C | 16°C | ★★★ Peak season |
| September | 19°C | 12°C | ★★☆ Good time |
| October | 14°C | 5°C | ★★★ Peak season |
| November | 9°C | 0°C | ★☆☆ Quiet / limited |
| December | 2°C | -5°C | ★☆☆ Quiet / limited |
Temperatures are approximate long-term averages for the area and vary with altitude; check a forecast before you travel.
