May's reputation is dominated by Golden Week (late April to May 5) — Japan's busiest travel period. But after May 6, something remarkable happens: the crowds evaporate, the prices drop, and Japan enters one of its most beautiful green seasons. Here's why mid-to-late May deserves serious consideration.
The Golden Week Effect
May 1–5 is among the most crowded periods in Japan. Shinkansen reservations are made months in advance; popular ryokan and Kyoto temple accommodation is fully booked. If you arrive after May 6, you inherit the infrastructure built for the rush — every restaurant, transport system, and attraction is operating at full capacity — but with dramatically lower visitor numbers. It's Japan running at maximum efficiency for a fraction of the crowd.
May Weather
May is arguably Japan's best weather month: Tokyo high 21–26°C, low 13–16°C, low humidity, minimal rain, long daylight hours. Kyoto similar. Hokkaido: 14–18°C, a genuine spring feel with late cherry blossoms at Hakodate and elevated locations. The rainy season (tsuyu) doesn't begin until mid-June in most of Japan, so May is pre-rainy season — reliably sunny days with cool evenings.
What's Happening in May
Wisteria season: Japan's most underappreciated floral display. Ashikaga Flower Park (Tochigi, 2 hours from Tokyo) has Japan's most spectacular wisteria — a 160-year-old vine covering an entire dome in purple clusters. Peak: late April to early May. Koinobori (carp streamers): For Children's Day (May 5), carp-shaped wind socks fill riverbanks and temple grounds — most visible May 1–5 but lingering through mid-May at some locations. Aoi Matsuri (Kyoto, May 15): One of Kyoto's three great festivals — a procession of 500 participants in Heian-period court dress from the Imperial Palace to Shimogamo and Kamigamo shrines. Free to watch along the route.
Seasonal Foods in May
Shincha (new tea): The year's first tea harvest reaches shops in early May — the freshest, sweetest, most delicate Japanese green tea of the year, available only for 2–3 weeks. Worth buying at a Kyoto or Uji tea shop for the seasonal experience. Takenoko (bamboo shoots): The fresh spring bamboo shoot season peaks in April–May. Takenoko-gohan (bamboo rice), takenoko no nimono (simmered shoots), and fresh takenoko salad appear on restaurant menus. The Kyoto restaurant association produces a dedicated takenoko course menu. Strawberry season: Japan's extraordinary ichigo (strawberry) season peaks late April–May. Tochigi Prefecture's Tochiotome variety and Fukuoka's Amaou are the most prized.
Kamikochi Opens (May 15)
The famous alpine valley in Nagano opens May 15 after winter closure. The two-week window between opening and Golden Week end (May 6–14) is Kamikochi's quietest period — excellent for hikers who want the valley to themselves. By late May the snow has largely cleared from the valley floor while the mountains above retain their white caps, creating the classic Kamikochi composition.