2026 update · All trails now charge a ¥4,000 entry fee. Advance booking is optional but recommended. Read the rules →
Home · When to climb
The official climbing season runs from July 1 to early September. Within that window, your specific week choice dramatically changes the experience.
| Week | Temp | Crowd | Weather | Note |
|---|---|---|---|---|
| Early July | 3–8°C (summit) | Low | Most rainy | Rainy season tail end. Fewest people but unpredictable weather. |
| Mid July | 4–9°C | Medium | Improving | Rainy season typically ends. Good balance of weather and crowds. |
| Late July | 5–10°C | High | Clear | Japanese school holidays begin. Crowds build quickly. |
| Early August (Obon) | 5–10°C | Very high | Clear | Obon holiday week — most crowded period. Avoid unless you like company. |
| Mid August | 5–10°C | High | Clear | Still busy but Obon has passed. Hut availability improves slightly. |
| Late August | 3–8°C | Medium | Clear | Schools resume, crowds drop. Good sweet spot for most climbers. |
| Early September | 0–6°C | Low | Variable | Final window. Coldest and quietest. Some huts close mid-month. |
Late August weekdays (Mon–Thu). You get clear weather, manageable crowds, and can still book huts without planning months ahead. Avoid Obon week (mid-August) at all costs unless you specifically want the crowded festival experience.
Target 4:30–5:00 AM summit arrival
Sunrise in peak season is between 4:30 and 5:00 AM. Arrive at the summit 15–30 minutes before for the best viewing spot.
Leave the hut by 1:30 AM
Most climbers stay at 8th-station huts. Budget 2–3 hours for the final push — it's slow, cold, and congested.
Crater rim walk adds 1 hour
After sunrise, walking the crater rim (Ohachi-meguri) takes ~60 minutes. Worth it if weather allows.
Small-group tours time the entire climb around sunrise — hut check-in, night rest, early wake-up, final push. No guessing about timing.
Book a sunrise tour (Klook) →