Mt. Fuji Sunrise and Sunset Times: Diamond Fuji and Inverted Fuji, Explained

Quick answer

Around the Fuji Five Lakes, sunrise swings from about 4:30 at the summer solstice to about 6:50 at the winter solstice; sunset runs from about 16:35 in December to about 19:05 in late June. The two calendar events photographers actually plan around are Diamond Fuji at Lake Tanuki (the sun rising over the summit, around April 20 and August 20, plus or minus a few days) and the sunset Diamond Fuji at Lake Yamanakako (visible somewhere along the shore from mid-October through late February). The inverted Fuji needs no calendar — it needs a calm, clear early morning, which is mostly a winter-and-dawn phenomenon.

Sunrise and sunset around the Five Lakes

Times below are computed with the standard sunrise equation for the Kawaguchiko area (35.51 N, 138.76 E, Japan time) at the start of each month. Actual times shift by a few minutes with your exact position around the lakes; for official values cross-check the National Astronomical Observatory of Japan's calendar (links at the end).

January: sunrise ~6:55, sunset ~16:50
February: sunrise ~6:45, sunset ~17:15
March: sunrise ~6:15, sunset ~17:45
April: sunrise ~5:30, sunset ~18:10
May: sunrise ~4:55, sunset ~18:35
June: sunrise ~4:30, sunset ~19:00
July: sunrise ~4:35, sunset ~19:00
August: sunrise ~4:50, sunset ~18:45
September: sunrise ~5:15, sunset ~18:10
October: sunrise ~5:35, sunset ~17:30
November: sunrise ~6:05, sunset ~16:50
December: sunrise ~6:40, sunset ~16:35

Diamond Fuji: two different events that share a name

Sunrise Diamond Fuji at Lake Tanuki (Fujinomiya side)

Tanuki-ko sits almost due west of the summit, so the rising sun crests the peak only when the sun's azimuth lines up — which happens twice a year, around April 20 and around August 20, with a usable window of a few days on either side. The sun clears the summit at roughly 6:00 a.m. On a calm morning the lake doubles the effect ("double Diamond Fuji" — the reflection completes the diamond below the waterline). Access is by bus from Fujinomiya Station; the lakeside park and the Kyukamura Fuji hotel grounds are the standard vantage points.

Sunset Diamond Fuji at Lake Yamanakako (Yamanashi side)

Yamanakako sits east-northeast of the mountain, and because the lake shore curves, the setting sun touches the summit from somewhere along the shore for a remarkably long season: mid-October through late February, with the moment drifting between about 15:30 and 16:30 as the sun's path and your standing point shift. The Hirano lakeside area is the classic spot, and the village runs a "Diamond Fuji Weeks" festival in the first half of February, when February's stable winter highs make the odds best.

Inverted Fuji: no calendar, just conditions

The mirror reflection needs three things at once: clear air, no wind on the water, and a viewing angle from the north or east shore. All three align most often in the first hour after winter sunrise — before convective wind picks up. Kawaguchiko (north shore) and Yamanakako are the classic reflections; Oishi Park and the Yamanakako Nagaike area are the named spots. On still mornings in cold months you sometimes get the bonus of mist lifting off the water as the sun warms it.

What the odds actually look like

Here is the honest part: the sun's schedule is perfectly predictable, the mountain's visibility is not. FujiVis archives its visibility-index source values daily as an open dataset; over 87 archived days (June 16 – September 10, 2026), the north-side forecast hit 7+ on 29% of mornings versus 11% of afternoons. (Those are forecast values as published, not observations.) Two practical consequences:

Anything involving sunrise gets better odds by default — you are competing with the 29% regime, not the 11% one.
Sunset Diamond Fuji at Yamanakako in late autumn and winter competes with the year's best visibility window, which is part of why February is the festival month.

On the day, stack the odds: pick the morning with the highest index, then confirm on the live cameras that the summit is actually uncapped before you commit to the lakeside in the cold.

Gear notes (brief)

Telephoto (200 mm+) for Diamond Fuji — the sun-over-summit disc is small; wide angle for the inverted reflection.
Tripod for pre-dawn and reflection work; circular polarizer carefully used (too much and you erase the reflection you came for).
Batteries die fast in the cold — winter lakeside mornings routinely sit below freezing; keep spares in an inside pocket.
Arrive 30–45 minutes before the computed time; the best light on the mountain often comes before the sun clears the ridge.

Why the azimuth matters

Diamond Fuji is geometry, not weather: the sun rises and sets at a slightly different point on the horizon every day, and only on the days when that point is exactly behind the summit — from your specific viewing spot — does the "diamond" appear. Two consequences worth internalizing:

The viewing point shifts with the date. At Tanuki-ko, photographers move along the shore by tens of meters across the week-long window; the local tourism association publishes guidance each season. At Yamanakako, the season is long precisely because different shore positions align with different sunset azimuths from October through February.
One or two days either side still shows something. The disc misses the summit slightly — rising from the shoulder or sliding down the flank — which is still a striking photograph, just not the perfect diamond. That is why a window, not a single date, is quoted everywhere.

A photographer's timeline for a Diamond Fuji morning

Two or three days before: confirm the window dates with the local tourism association's current-season page, and pick two candidate mornings so weather can veto one.
The evening before: after the ~16:30 JST index update, check the visibility forecast for the viewing side; below 5, sleep in and try morning two.
60–90 minutes before computed time: arrive, scope the alignment line, set up. Lakeside positions fill surprisingly early in the middle of the windows.
The moment itself: the disc crests or touches the summit for only a few minutes. Bracket exposures aggressively — the dynamic range between the sun and the mountain is extreme.
Afterward: stay 20 minutes. Post-sunrise alpenglow on a snowcapped summit is frequently better than the headline event.

FAQ

Is Diamond Fuji visible every day in the window?

No — only when the summit is cloud-free at that exact time. The alignment is astronomical; the visibility is weather. Budget two or three mornings inside the window if the shot matters.

Diamond Fuji and "Pearl Fuji" — same thing?

Related but different: Pearl Fuji is the moon (not the sun) sitting on the summit, so it follows the lunar calendar, not the solar one. The same west-lake/east-lake geometry applies around a full moon.

Where is the exact spot for the Tanuki-ko event?

The alignment point shifts slightly with the date within the window; the Fujinomiya City Tourism Association publishes the viewing guidance each season, and the crowd on the morning is a reliable homing beacon.

Do the sunrise times change much between the lakes?

A few minutes at most — the lakes are within ~15 km of each other. What changes much more is what blocks or frames the mountain from each shore.

Sources

Written by the VoyBird Team. Sunrise and sunset times are computed with the standard solar equation and rounded to the nearest 5 minutes — cross-check the NAOJ calendar for exact minutes. More about who we are.