Chichibu moss‑phlox is peaking

Japan’s most photogenic pink hillside is already in peak mode on Friday, April 10: Chichibu’s official tourism site says the northwest and southwest slopes at Shibazakura Hill are at “best viewing,” while the east slope is still only about 20 percent open. That split matters on the ground, because Hitsujiyama Park is planted like a patchwork quilt rather than one flat field, so visitors this weekend will see full color blocks next to sections that are still filling in. The site says the hill covers about 17,600 square meters with more than 400,000 plants in 10 varieties. The paid season also began on Friday, April 10, which is usually the signal that Chichibu expects the bloom and the foot traffic to arrive together. Adult admission is 500 yen, group admission is 400 yen for parties of 20 or more, and middle school students and younger enter free. Parking flipped to paid on the same date and the city is openly warning that roads around the park get heavily congested during the moss-phlox period. The official rates are 700 yen for cars, 300 yen for motorcycles, 3,000 yen for large buses, and 2,000 yen for microbuses. This is not a remote mountain flower field that requires a rental car. The Japan National Tourism Organization says Seibu Railway’s Limited Express Laview runs direct from Ikebukuro to Seibu-Chichibu Station in about 90 minutes, and the park is about a 20-minute walk from the station. The reason Chichibu gets attention every spring is scale plus backdrop. The hill sits below Mount Buko, and the tourism materials describe one of the largest moss-phlox displays in the Kanto region, which is the greater Tokyo area. The flower itself is not cherry blossom even though the Japanese name sounds like it. Chichibu’s official guide says shibazakura is phlox subulata, a perennial originally from North America that gets its name because the flowers resemble sakura while the plant spreads low across the ground like grass. This year also lands on a milestone for the site. Chichibu says 2026 marks the 25th anniversary of the public opening of Shibazakura Hill, which helps explain why the city has special branding around this season instead of treating it like just another bloom update. The festival itself runs from Friday, April 3, to Wednesday, May 6, but bloom timing is never perfectly aligned with calendar dates. On April 10, the city’s own update shows the payoff has arrived early in two major sections, which is why this weekend is likely to be the sweet spot for photos and the hard part for crowds.