Autumn Harvest Guide: Chestnuts, Sweet Potatoes, Mushrooms
Autumn harvests in Japan cluster three hands-on farm activities into one short season: chestnut picking, sweet potato digging, and mushroom picking.123 All three run on the same tourist-farm booking mechanics as orchard fruit picking, so this guide points back to that model instead of re-explaining it.
Fees, rules, and requirements can change. Confirm current details at the prefecture tourism and individual farm sites linked in References.
Overview
The autumn trio sits apart from orchard fruit picking. 栗狩り (kuri-gari, "chestnut picking") gathers fallen nuts in September and October.14 芋掘り (imo-hori, "sweet potato digging") pulls tubers from September into November and draws heavy family and school-outing traffic.12 きのこ狩り (kinoko-gari, "mushroom picking") at tourist farms means picking cultivated species such as shiitake from September into November.13
Two boundaries shape the whole article. First, every date and fee below is the cited farm's own listing, never a national standard.142 Second, farm mushroom picking is categorically different from wild forest foraging, which carries a genuine poisoning hazard.56
The Autumn Trio
Each activity peaks inside September to November, but the exact weeks move farm by farm. Confirm the current season with the farm before building a day around it (as of each listing below; confirm current figures with each farm).
Chestnut picking
Japan's chestnut heartland is Ibaraki, which leads the country in Japanese chestnut cultivation area and shipment volume, with Kasama, Kasumigaura, Ishioka, Omitama, and Ibaraki Town as main areas.7 Kaneko Farm in Kasama offers picking experiences in that producing belt, open to visitors from children to adults.8
Farm seasons are short. Nakatsugawa Marron Park in Gifu runs from early September to early October across about 1,600 trees and 20 varieties, with picked chestnuts sold by weight and admission at 600 yen for adults and 200 yen for elementary students (as of the 2025-11-14 directory update; confirm current figures with the park).4 Nakamasaen in Minoh, Osaka, runs chestnut picking from September 13 to November 3 at 1,700 yen (as of the Osaka tourism listing).1 Narita Yume Bokujo in Chiba offers chestnut picking from late September to mid-October, with tongs provided for the burrs (as of the event listing).2
Ripe chestnuts fall when their burrs split open, and visitors gather the fallen nuts rather than knocking burrs from the trees.4 Borrowed tongs handle the spines; hands do not.
Sweet potato digging
Imo-hori is the most family-weighted of the three, with Kanto farms near Chiba and Ibaraki drawing school outings alongside visiting families.2 Narita Yume Bokujo runs its sweet potato harvest from mid-September to mid-November with the Silk Sweet variety (as of the event listing; confirm current figures with the farm).2
Nakamasaen starts digging in early October and continues until the field is dug out, at 800 yen plus 380 yen admission (as of the Osaka tourism listing).1 That open-ended closing is the key planning fact: a dug-out field ends the season whenever the potatoes run out, not on a printed date.
Dug sweet potatoes travel dirty. Farms expect you to bag them as dug, so pack a spare tote and keep your daypack out of the soil.
Mushroom picking at cultivated farms
Tourist mushroom picking uses farm-grown species. Nakamasaen runs 椎茸 (shiitake, "oak mushroom grown on logs or beds") picking from September 17 to November 3 on Saturdays, Sundays, and holidays at 700 yen plus 380 yen admission, with advance reservation required (as of the Osaka tourism listing; confirm current figures with the farm).1 Kawanishien, also in Minoh, runs sweet potato and shiitake experiences from mid-September to late October on weekends only, with shiitake reservations at least 3 days ahead and stoves for rent to eat harvested shiitake on the spot (as of the Osaka tourism listing).3
These are cultivated beds and logs on a managed farm. Nothing in this section applies to mushrooms growing wild in mountains, parks, or roadsides, and the safety section below explains why that line matters.56
Booking and Day-Trip Logistics
Autumn farms run the same playbook as orchards. Dated admission, per-activity fees, advance reservations at popular farms on weekends, and take-home priced by weight or per activity are the shared shape.14 Full detail on time-limited eating slots and weighed take-home pricing lives in Seasonal Fruit Picking in Japan: A Year-Round Orchard Guide, which owns the canonical explanation for both articles.
The same booking model as fruit picking
Book autumn farms the way you would book a strawberry farm. Nakamasaen requires advance reservations for shiitake picking, and Kawanishien asks for at least 3 days' lead on the same activity (as of the Osaka tourism listings).13 Marron Park sells picked chestnuts by weight on top of its admission, the same two-bill shape as orchard mochikaeri (as of the 2025-11-14 update).4 Weekend slots in October, when all three activities overlap, behave like peak strawberry weekends: earliest booking wins.
Per-activity fees stack. Nakamasaen's 380 yen admission sits under each activity fee, so a chestnut plus shiitake day costs admission plus both activity prices (as of the Osaka tourism listing; a second directory page lists 400 yen admission and 1,000 yen shiitake, so treat every figure as farm-set and changeable).19
Getting there
Autumn farms sit in the same rural belt as orchards, so the access pattern repeats: rail to the nearest station, then bus, shuttle, or taxi. Nakamasaen is reached by Hankyu bus from Ikeda station and then about 15 minutes on foot.1 Narita Yume Bokujo runs free shuttles from JR Namegawa station in about 10 minutes and JR Narita station in about 40 minutes, and sits about 2 minutes by car from the Shimousa interchange.2 Marron Park is about 15 minutes by taxi from JR Nakatsugawa station.4 Check whether the farm's shuttle runs on weekdays before assuming it does; weekend-only transport is common.
The Wild Mushroom Line
This is the safety-critical section. Tourist mushroom picking at a cultivated farm and wild mushroom foraging in Japan's mountains and forests are different activities with different risk profiles, and only the first belongs in a visitor itinerary.56
Cultivated picking is not forest foraging
The numbers behind the warning are national and recent. Japan counted 595 mushroom poisoning patients over the ten years to 2024, with 566 cases, over 90 percent, falling in September, October, and November (as of 2025-09-30; confirm current figures with the Ministry of Health, Labour and Welfare).5 The most common cause across that decade was Tsukiyotake with 305 illnesses, a species easily mistaken for oyster, Mukitake, or shiitake mushrooms.5 The deadliest was Dokutsurutake with 2 deaths, mistaken for several edible field mushrooms.5
Single cases keep the pattern current. In 2024 Dokutsurutake caused 48 illnesses and one death: a man in his 20s in Ueda City, Nagano, who ate wild mushrooms found on a roadside (as of 2025-09-30).5 A restaurant case in Anan City, Tokushima, poisoned 8 people who ate visitor-brought Tsukiyotake served as grilled mushrooms.5 毒キノコ (doku-kinoko, "poisonous mushroom") identification defeats even experts for some species, which is why the ministry's rule is categorical rather than visual.56
If you feel ill after eating mushrooms
Treat any illness after eating wild mushrooms as a medical matter, not a wait-and-see situation. The ministry's guidance is direct: see a doctor promptly.6 Call Japan's emergency numbers and head to a hospital or clinic set up for tourists; both have dedicated coverage in this guide. Farm-picked cultivated mushrooms carry no such warning; this section covers wild mushrooms only.
Pairing Harvest Days with Autumn Foliage
The harvest trio shares its September to November window with koyo season, so one autumn trip holds both without forcing either into a spare half day.12 Read its forecast first, then pin a harvest farm near your chosen foliage stop: chestnuts around Tokyo or Osaka in early autumn, sweet potatoes wherever the family day fits, and foliage wherever the color peaks that week.
Good to know
Chestnut burrs demand tongs and sturdy shoes
Ripe nuts sit inside spiky burrs on the ground, and farms lend tongs for exactly that reason.42 Wear closed shoes with grip; Marron Park recommends sneakers and prohibits knocking burrs from trees, so the harvest is a ground search, not a reach.4
Sweet potato fields finish when they are dug out
Nakamasaen runs digging until the potatoes are gone, which means late-season visits can find a finished field with no posted closing date (as of the Osaka tourism listing).1 Go early in the digging window if the activity matters more than the rest of the day.
Chestnut windows are short, so confirm before you go
Marron Park's season spans about one month from early September to early October, and Narita chestnuts run late September to mid-October (as of the 2025-11-14 update and event listing).42 Of the three activities, chestnuts punish vague timing most, so confirm the farm's current picking status in the week you travel.
See also
- How Far Is a Reasonable Day Trip in Japan?
- How Many Things Can You Actually Do in a Day? A Realistic Pacing Framework
- Kyoto's Seasonal Crowding Calendar: Cherry Blossom and Autumn Foliage