Grape picking Sayama, Saitama. Sayama Grape season generally starts in August. What week in August depends largely on the fruit picking farm. The grape picking season is one of the shorter fruit picking seasons, generally finishing up in the middle of September. However, you can currently only buy directly from the vineyards and the picking season is a few weeks away yet.
Grape Picking Sayama

Grape picking costs start from 600 yen for an adults, 500 yen for a school aged child, 400 yen for preschoolers and 200 yen for toddlers. That is for an eat as you pick system, but you can pay extra to buy the grapes you pick to bring them home.
Sayama Vineyards
There are five vineyards in Sayama that I am aware of, all in the vicinity of the Iriso station in Sayama, three of them are outlined below.
宮岡ぶどう園, Miyaoka Vineyard
Address: 1058 North Iriso,
Phone: 04-2959-4949
Opening: This vineyard tends to open on August 7th annually. Generally it runs until early October
Hours: 9 am to 6 pm Thursday to Tuesdays, closed Wednesdays
Access: 10 minute walk from the East exit of Iriso station on the Seibu Line
宮信観光ぶどう園, Miyashin Vineyard
☆RESERVATION REQUIRED
Telephone: 04-2959-4059,
Website: https://www.miyashin.com/ (Japanese only)
Open: You can buy grapes from mid August generally, but picking doesn’t start until September 1st.
Hours: 9 am – 6 pm, picking until 5 pm. Closed on Mondays.
Access: 15 minute walk from Musashi Fujisawa Station on the Seibu Line, 18 minute walk from the West exit of Iriso station
This farm used to have kiwi picking too, but I see they dropped it. They do still sell kiwis for consumption. They also have pear picking. However, this year 2020, they will not be offering pear picking and will only have pears for sale.
宮俊ぶどう園, Miyatoshi Vineyard
Telephone: 04-2959-3651,
Open: They started selling the grapes around mid August this year (2020). However, as yet, they have no information about picking this year.
Hours: 9 am – 5 pm
Access: 13 minute walk from Iriso station on the Seibu Shinjuku Line