春 SPRING · APRIL–JUNE · BABIES & BLOSSOM
The one season with a reason that is not the pool
Births run April to June with the peak in May. The bath goes out of use over the same weeks, so spring is a straight trade: infants instead of steam, on an emptier trail, at the same gate price.
Mean air 10.6 to 20.4 °C in Nagano city, and the park at 850 m runs two to three degrees colder. The gate is 8:30–17:00.

One price in every month of the year, and the park asks visitors to arrive 30 minutes before closing time.
The ticket, in detail湯THE GUIDED DAY, YEAR-ROUND$140 (≈¥21,800)PER PERSON · TICKET INCLUDEDOne price in all twelve months. What changes is what is at the end of it.
Live dates in springThe 3 months of spring, side by side
BABIES / QUIETApril still has winter in its first week — the park changes to summer hours on the 1st and the express bus drops to the green season on the 7th. May is the peak of the births. June is the tail of them and the start of the rainy season.
What spring is, at this park
Infants. Births run April to June, with the peak in May, and the pool is largely out of use by now.
Births run April–June, peak May. The bath goes out of use over the same weeks, so the two halves of spring look nothing alike.
The park publishes a predicted time for the monkeys coming down from the mountain and asks visitors to check before traveling and again on the day, through its live cameras and social accounts — the only thing that answers «will they be there today», and it is free.
Spring cannot give you both pictures
Read before bookingThe cherry blossom is mid-April in the city, 400 m below the park, and the last of the bathing is a cold morning at 850 m. They are two different days, and no itinerary makes them one.
THE TROOP DECIDES Park staff work to attract the monkeys during opening hours, but the monkeys may not show up at all on certain days; appearances are particularly sporadic in autumn. Seven of the 21 tours on this site include the ¥800 (≈$5.1) gate fee in the price and the rest leave it at the gate; not one of them includes a monkey.
LIVE DATES · SPRING · FROM NAGANO · TICKET INCLUDED
Spring, month by month
Of the 3 months in spring, April ranks highest on this site’s own order — 5th of twelve. That is a ranking, not a promise.
OR APRIL · MAY · JUNE · ALL TWELVE COMPARED