Gunma Insect Forest

The operator suggests observation building → butterfly greenhouse → Grasshopper Meadow → farmhouse → annex → food-plant/rearing greenhouse. Follow the signed paths and current access instructions between those landmarks. Allow about three to four hours including looking, breaks and lunch; this is our planning estimate, not the operator’s route duration. Aim for the farmhouse before its 15:00 interior closing time.

For rain, limited energy or a short visit, concentrate on the main building’s exhibits and greenhouse, then decide whether the annex suits your group. Allow roughly 90 minutes to two hours as an editorial estimate. Ask staff for the lift route and accessible connections; this is a selection of stops, not a certified step-free circuit.

Spend five quiet minutes watching one area of grass, then compare it with the edge of a path. Count movements or different shapes rather than requiring children to know names. A drawing of what an insect was doing is a useful record even when you cannot identify it. This is a self-guided family idea, not a scheduled park program.

Check the second-floor desk for crafts and other sessions. The park offers paid insect crafts, shorter mini-crafts and some free self-led activities; session times and places vary. Using a cocoon or natural material supplied for a workshop does not give permission to collect materials elsewhere in the grounds.

The follow-up learning corner has more than 10,000 books, including picture books, field guides and specialist titles. It is a useful place to turn a mystery from the meadow into a question to investigate. The annex also has the cafe and museum shop, so this can be a natural pause rather than another task to complete.

The conspicuous rice paper butterfly is the park’s named greenhouse highlight. Watch its slow flight and, if on display, compare the adult with its golden pupa. These butterflies are maintained in a subtropical exhibit, not evidence of a wild Kiryu population.

The floor guide names Hercules beetles among the living insects from other parts of the world. Read the individual display label and watch without tapping the enclosure. The listed exhibit is captive; no wild outdoor encounter is implied, and individual animals may change.

The managed woodland includes kunugi, or sawtooth oak. Its long, toothed leaves and deeply furrowed bark reward a close look even when insects remain hidden. The source confirms trees in the woodland but does not establish whether an individual tree was planted or naturally regenerated.

The observation building’s entrance is on the third floor, with exhibits and the program desk below and the greenhouse reached at the first-floor level. Its large glass dome was designed by Tadao Ando. Use the official floor plan to orient yourself before following a staircase; lifts are available.

In the subtropical greenhouse, let butterflies approach rather than chasing them. Then look for the separately identified food-plant and rearing greenhouse: raising larvae, pupae and adult butterflies also depends on growing the right plants. Follow visitor signs and staff directions rather than entering working spaces.

This rounded open area is surrounded by a patchwork of rice fields, pond, cultivated land and trees. Choose a small patch to watch instead of rushing across it. Field Station 1 has insect interpretation, toilets and a place to pause; a short search can be more rewarding than covering every path.

The relocated early-Meiji house preserves an Akagi-style roof, cut back at the front so light and air could reach silkworm rooms upstairs. Its interior is normally viewable from 10:00 to 15:00 on opening days. Traditional games in the yard add a playful stop, while May–October silkworm rearing is seasonal and not guaranteed on every visit.

The woodland includes the hill called Fuji or Fuji-yama (不二山) and Tsutsumi Pond farther southeast. The summit’s 285.6 m figure is its elevation above sea level. The operator specifically warns of steep, unstable footing on the pond approach. Treat these as optional extensions for a suitable group, rather than essential family stops; Field Station 2 is normally closed.

Traditional satoyama woodland was cut and tended for fuel and leaf compost. The park explains how this human work also helped create insect habitats. The landscape’s lesson is about relationships between people and nature, not simply leaving every place untouched.

The farmhouse’s upper windows served a practical purpose: light and ventilation for sericulture. Looking from the outside first makes the arrangement inside easier to understand. The building is a Kiryu municipal cultural property and a registered part of Gunma’s silk heritage.

The operator’s English introduction reports more than 1,400 insect species and 80 bird species confirmed at the site. These are accumulated records, not a promise of that many species, or any particular animal, during your visit.

Spring changes the farmhouse surroundings with flowering trees and plants; around May the operator notes azaleas near the hill ridge. Summer invites longer outdoor observation and falls within the farmhouse’s May–October silkworm season. Plan shade and water breaks, and let the weather determine how much woodland to attempt.

Listen as well as look. Singing insects are a theme of the seasonal exhibition, while the operator’s recurring October guide includes chestnut tiger butterflies and hawkmoths. This is seasonal potential, not a fresh sighting report for October 2026. Autumn colour around the pond is also weather-dependent, and its steep approach remains a consideration.

Use the indoor exhibits and greenhouse as your anchor, with a shorter outdoor look when conditions suit. The farmhouse’s seasonal planting includes wintersweet and plum. Closing time is 16:00 from November through March, with last entry at 15:30, and the year-end closure runs from 28 December through 8 January.

Regular admission is ¥410 for adults and ¥200 for university and high-school students; junior-high pupils and younger children enter free. Bring student identification for the student rate. Qualifying disability and specified-illness documentation can grant free admission for the holder and one caregiver; confirm your document with the park. Individual programs may cost ¥100–500. Hours are 09:30–16:30 April–October and 09:30–16:00 November–March, with final entry 30 minutes earlier. Mondays normally close, or the following day after a Monday holiday; consult the actual calendar for exceptions.

The annex sells light food and drinks, but there is no full restaurant and indoor seating is limited. A packed lunch and water bottle give you more flexibility; eat in permitted outdoor places or the annex rest area and take rubbish home. The main building has a first-floor nursing room, accessed by asking at the office, and third-floor lockers requiring a refundable ¥100 coin. Use the official map for toilets; the temporary meadow toilet is Japanese-style and is excluded from the operator’s multipurpose-toilet list.

The park lists accessible parking, ramps, a lift and multipurpose toilets, plus four wheelchairs available free at the South Gate or office. Availability is limited. It recommends an accompanying helper because the grounds rise and fall. Free stroller loans are also offered, but the operator recommends stroller use around the observation building rather than the wider grounds. Confirm the route, toilet suitability and any equipment you need directly on 0277-74-6441; the illustrated maps do not provide gradients or a verified all-park accessible circuit.

The address is 460-1 Tsurugaya, Niisato-cho, Kiryu, Gunma 376-0132. The operator lists 300 free parking spaces and estimates about 25 minutes over 12 km from Isesaki Interchange on the Kita-Kanto Expressway, or 45 minutes over 28 km from Akagi Interchange on the Kan-Etsu Expressway. These are approximate driving figures, subject to traffic.

Akagi and Niisato stations are each listed about 3 km away, roughly ten minutes by taxi. From Niisato, the park points visitors to the Egao-go demand taxi. The city says to reserve by phone from the previous day until 30 minutes before travel: 0120-44-2310, booking desk 07:00–19:00. Service runs 08:30–18:00; pooled rides and availability can affect timing. The posted adult fare is ¥300 for an ordinary trip and ¥600 for journeys to or from Akagi Station. Confirm the pickup, fare and return when booking rather than expecting a walk-up shuttle.

Wear shoes that grip and keep children close beside ponds and on steps. Avoid steep woodland or pond paths when wet, and respect every restricted-area marking. Never break rotting logs or enter leaf-compost enclosures to search for insects. Do not handle an animal you cannot safely identify; ask staff for help. Keep nets away from other visitors and do not catch greenhouse butterflies. Tents, tarps, wagons, barbecues, bikes, scooters, ball games and smoking are prohibited. The main first-floor office has an AED; alert staff promptly if someone needs help.

The current calendars show 20 October as a scheduled opening day. Besides the normal weekly closures, they mark 29–30 October and 4–6 November closed. Check again before travel for weather or operational changes.

The Autumn Field Insects exhibition runs from 5 September to 28 October 2026 in the first-floor exhibition room. Admission is advertised as free on 28 October for Gunma Prefectural Citizens Day, but that day’s peanut-digging activity has been cancelled because of a poor crop. Check the event list for the remaining activities.

The park’s FAQ says the indoor insect-handling corner is suspended. A separate notice suspends film screenings in the first-floor theater until further notice because of equipment trouble. These notices do not announce closure of the entire observation building.