Ibaraki is one of those prefectures that rewards visitors who time their trip to the season. Come at the wrong time of year and you will find pleasant but unremarkable farmland and coastal towns. Come at the right time and you will encounter one of Japan’s great plum blossom festivals, a hillside of 4.5 million blue nemophila flowers, a crimson landscape of kochia balls in October, or a samurai parade through a city with a 300-year connection to Japan’s most beloved historical drama. This guide runs through the calendar month by month, with the practical details you need to plan around each event.

Winter (December–February)

Anko Season at Oarai (December–March)

Winter on the Ibaraki coast is anko season. Anko — monkfish — is considered one of Japan’s finest winter delicacies, and the coastal town of Oarai is one of the best places in the country to eat it. The fish is caught in the cold waters of the Kashima Nada and prepared primarily as anko nabe: a rich, warming hot pot made with all seven edible parts of the fish, including the liver, which is dissolved into the broth to give it a depth of flavour that has earned it comparison to foie gras.

The season runs from around November to March, with January and February considered peak quality. Oarai has dozens of restaurants offering anko nabe sets at prices ranging from roughly ¥3,000 to ¥6,000 per person depending on portion size and establishment. The town is accessible from Mito in about 25 minutes on the Kashima Rinkai Railway. No advance booking is needed for most restaurants on weekdays, but weekends in January and February fill up — reserve ahead if possible.

Plum Buds at Kairakuen (Early February)

While the main plum blossom festival does not open until late February, Kairakuen garden in Mito begins its season earlier with the first trees coming into bloom in early February. Visiting before the formal festival period means free entry, lighter crowds, and the quiet pleasure of watching a garden wake up. The 3,000 plum trees of 100 varieties do not all flower simultaneously — early varieties bloom white and pink from the first week of February, while late varieties hold until late March.

Spring (February–May)

Mito Plum Blossom Festival — Kairakuen Baien Matsuri (Late February–Late March)

Japan has three great landscape gardens — Kenroku-en in Kanazawa, Korakuen in Okayama, and Kairakuen in Mito. Kairakuen is the only one of the three that was designed for public enjoyment from its creation in 1842 by Lord Tokugawa Nariaki of the Mito Domain. It contains 3,000 plum trees of 100 named varieties spread across sloping grounds above Lake Senba, and each spring it hosts Japan’s largest plum blossom festival.

The Mito Plum Blossom Festival (Baien Matsuri) runs from late February to late March. During the festival period the garden charges an entry fee of ¥300, compared to free entry outside the festival. The trees are at their collective peak in early to mid-March in a typical year, though the exact timing depends on the winter temperatures — the festival website and local tourist offices publish bloom forecast updates from mid-February onwards.

Festival activities include traditional performing arts on an outdoor stage, food stalls along the garden paths, and a ceremonial plum picking event on certain dates. On weekends during peak bloom, the garden and the surrounding streets fill significantly. Arriving by 9:00 is advisable on busy weekends. Mito Station is accessible on the JR Joban Line, about 75 minutes from Ueno. The garden is a 15-minute walk or short taxi ride from the station.

Adjacent to Kairakuen, the Kodokan — a domain school built in 1841 under Lord Nariaki — is free to enter year-round and worth half an hour during a festival visit. It is one of the largest surviving domain schools in Japan and retains its original buildings. The Mito Tokugawa Museum, a short distance away, houses the Mito branch family’s collection of armour, scrolls, tea ceremony implements, and Tokugawa documents — a natural pairing with the festival period.

Nemophila Season at Hitachi Seaside Park (Mid-April–Early May)

Hitachi Seaside Park’s spring nemophila display has become one of the most photographed natural spectacles in Japan. The park’s Miharashi Hill is planted with approximately 4.5 million nemophila (baby blue eyes) flowers that bloom simultaneously in mid-April to early May, covering the hillside in an unbroken sheet of pale blue that under clear skies blends almost seamlessly with the horizon.

The peak bloom typically falls in the last week of April and the first week of May — a period that overlaps with Golden Week, when the park experiences its highest attendance of the year. On Golden Week days, visitor numbers can reach 20,000 or more. Arriving when the park opens at 9:30 is strongly advisable; the car parks fill by mid-morning. Access is by shuttle bus from Katsuta Station (the bus operates only during the bloom season), or by bicycle from the station in approximately 20 minutes.

Entry to the park is ¥450 for adults. The 350-hectare site also has cycling routes, barbecue areas, and amusement rides, making it suitable for a full day. Bicycle rental within the park is ¥500 for 2 hours.

Bloom forecasts are published on the park’s official website from early April. These are updated regularly and give a percentage-complete indicator that helps with planning the optimal visit day.

Kashima Jingu Spring Grand Festival (Golden Week)

During Golden Week — approximately late April to early May — Kashima Jingu holds its Spring Grand Festival (Shinko-sai). The centrepiece is a yabusame ceremony: mounted archers in full samurai dress gallop along the shrine’s cedar-lined approach and fire at targets at speed. This is one of the rarer ceremonial forms in Japan, practised at only a handful of shrines. Exact dates vary by year; the shrine’s official website publishes the schedule from March onwards.

Summer (June–August)

Summer Flowers at Hitachi Seaside Park (June–August)

After the nemophila season, Hitachi Seaside Park transitions through a sequence of summer flowers. Roses bloom in late May and June in the park’s rose garden. July and August bring sunflowers, zinnias, and a poppy field that creates a different but still vivid landscape. Summer crowds are smaller than Golden Week, and the park’s cycling infrastructure makes it a comfortable outing on a clear morning before the afternoon heat sets in.

Mito Komon Festival (Late July)

The Mito Komon Festival is one of Ibaraki’s largest summer matsuri, held across several days in late July in central Mito. The festival celebrates Tokugawa Mitsukuni (1628–1701), the second lord of the Mito Domain and one of the most beloved figures in Japanese popular culture. Under the pen name Mito Komon, Mitsukuni is the protagonist of a long-running jidaigeki (period drama) television series that ran for nearly 50 years and remains one of the most-watched dramas in Japanese broadcasting history. The character — an elderly retired lord who travels the country in disguise dispensing justice — is immediately recognisable to Japanese audiences.

The festival’s main event is a large parade through central Mito featuring performers in Edo-period costume, traditional floats, and performances invoking scenes from the drama. The parade draws visitors from across the Kanto region. Mito city’s streets become unusually lively for an evening that is otherwise relatively quiet by Japanese urban standards.

Oarai Beach Season (July–August)

Oarai’s Pacific beach opens for the designated swimming season in July and August. The beach is wide and sandy, with water quality maintained by the exposed coastal position. It is significantly less crowded than the beaches of Shonan or the Miura Peninsula, with a more local character. The Oarai Isosaki Shrine — whose torii gate stands on rocks in the sea just north of the beach — is photogenic in summer light and at sunrise year-round.

Autumn (September–November)

Kochia Season at Hitachi Seaside Park (Mid-October)

Hitachi Seaside Park’s autumn spectacle rivals its spring nemophila display. Miharashi Hill, the same hillside covered in blue in spring, is planted with kochia — a round, bushy plant that turns scarlet red over the course of October. At peak colour, usually around the second or third week of October, the hill becomes a sea of deep crimson. The visual contrast between the red kochia, the blue sky, and the distant sea is striking.

Kochia season draws large crowds but is generally less intense than Golden Week. Access is the same as in spring: shuttle bus from Katsuta Station (operating seasonally), or bicycle from the station. Entry ¥450. Bloom forecasts are published on the park’s official website from late September.

Kasama Chrysanthemum Festival (October–November)

Kasama Inari Shrine — one of Japan’s three great Inari shrines alongside Fushimi Inari in Kyoto and Yutoku Inari in Saga — hosts a chrysanthemum festival from October into November. Over 10,000 chrysanthemum plants in hundreds of varieties are displayed around the shrine precincts, many of them trained into elaborate forms including traditional kiku ningyo (chrysanthemum doll) arrangements in which full-size human figures are created from living flowers. This craft form dates to the Edo period and is rare enough that Kasama is one of the few places where it can be reliably seen.

The shrine itself is worth visiting independently of the festival: the approach is lined with fox statues (Inari is the deity of foxes, rice, and prosperity), and the main hall dates from the 17th century. Access is from Mito by bus, approximately 40 minutes.

Kasama Pottery Festival — Kasama Ceramic Arts Festival (November)

Kasama-yaki (Kasama pottery) is one of Japan’s most active contemporary ceramics traditions, and the town of Kasama is home to over 100 pottery workshops and kilns. In November, the Kasama Ceramic Arts Festival is held across the town over a long weekend, drawing an estimated 50,000 visitors and making it Japan’s largest pottery market. Potters from across Japan rent stalls alongside local Kasama ceramicists, creating an unusually broad selection at prices typically well below gallery retail. The festival grounds spread across the city centre and the area around the shrine.

For those unable to attend the festival, pottery workshops are available year-round. Most require advance booking and cost ¥1,500–¥3,000 per person for a 60–90 minute session, with finished pieces fired and shipped within a few weeks.

Anko Season Begins (November)

As the water temperature drops in November, anko season opens at restaurants across the Oarai coast. November is considered the start of the season rather than its peak — the fish are at their best after the coldest months — but the restaurants are less busy than in January and February, and the weather is still mild enough to make the coastal drive pleasant.

Practical Tips

Accommodation during peak events: Hitachi Seaside Park nemophila season coincides with Golden Week, one of Japan’s three main holiday periods. Accommodation in Mito, Katsuta, and Oarai sells out weeks in advance. Book at least 6–8 weeks ahead, or consider staying in Tsukuba or even Tokyo and taking the train up on the day. For the Mito Plum Blossom Festival, weekday visits in early-to-mid March are generally bookable at shorter notice.

Crowd management at Hitachi Seaside Park: During Golden Week, the shuttle bus from Katsuta Station operates at high frequency but queues form. Cycling from the station takes about 20 minutes and bypasses the queue entirely — bicycle rental is available at the station. Inside the park, Miharashi Hill is busy around midday; arriving at 9:30 opening or visiting late afternoon (after 15:00) gives a calmer experience.

Bloom forecasts: Both the nemophila and kochia seasons at Hitachi Seaside Park vary by up to two weeks depending on the year’s weather. The park publishes weekly bloom percentage updates on its official website from early April (for nemophila) and late September (for kochia). These are the most reliable guide to timing a visit.

Getting around: Ibaraki’s event sites are spread across the prefecture and public transport connections between them are limited outside the Mito–Katsuta corridor. For combining Kashima, Oarai, and Kasama in a single trip, a rental car from Mito Station is the most practical approach.