Sushi Koshu

About

Japanese, Sushi Bars, Soup

Price Range : $11-30 ($$)

  • star
    Yelp rating
    4 stars

Location

Adress: 20627 Golden Springs Dr Ste 2k, Diamond Bar, CA 91789

Phone: (909) 869-7881

Work Hours

Mon
Tue 11:30 am-2:30 pm
Wed 11:30 am-2:30 pm
Thu 11:30 am-2:30 pm
Fri 11:30 am-2:30 pm
Sat 5:00 pm-9:30 pm
Sun 5:00 pm-9:00 pm

Business info

  • turned_in_not
    Health Score
    A
  • list_alt
    Takes Reservations
    Yes
  • directions_car
    Delivery
    No
  • move_to_inbox
    Take-out
    Yes
  • credit_card
    Accepts Credit Cards
    Yes
  • thumb_up
    Good For
    Lunch, Dinner
  • local_parking
    Parking
    Private Lot
  • directions_bike
    Bike Parking
    No
  • accessibility
    Good for Kids
    Yes
  • group
    Good for Groups
    Yes
  • new_releases
    Attire
    Casual
  • insert_emoticon
    Ambience
    Casual
  • volume_up
    Noise Level
    Average
  • local_bar
    Alcohol
    Beer & Wine Only
  • turned_in_not
    Good For Happy Hour
    Yes
  • transit_enterexit
    Outdoor Seating
    No
  • wifi
    Wi-Fi
    No
  • tv
    Has TV
    Yes
  • turned_in_not
    Dogs Allowed
    No
  • turned_in_not
    Waiter Service
    Yes
  • fastfood
    Caters
    Yes

Reviews

  • Jayson P.

    star star star star star 19 June 2026

    This is an automatic lunch stop for me whenever I am in the area. I rarely do anything other than omakase with Tomi-san at the sushi bar so this review is based on that. The fish is always fresh here. Sometimes on Thursday or Friday at lunch before the weekend rush you can see Tomi and his son processing fresh fish during lunch awesome to see them process large bluefin tuna and kinmedai. When at the bar Tomi will start you with something fresh from his garden usually a nice small refreshing dish - Japanese eggplant dishes have been memorable and I especially love when his persimmon tree bares fruit for dessert. I've probably been here at least a hundred times so he will usually just wait to see what my level of appetite is or if I want anything specifically that day. Otherwise it's almost like a Brazilian steakhouse and I just tap when I'm full. I definitely have not had a bad experience here.

  • Kevin H.

    star star star star star 18 June 2026

    The fish quality here is amazingggg. One of the best experiences all the way out in Diamond Bar. We came here and had the $60 Chef's choice and it was some serious Cloud 9. *5 stars for food*, overlooking the tad bit slower service. The two of us shared the platter and was quite full already. Maybe could've had an appetizer or dessert to seal the deal, but no need to overeat at all. It was extremeful delightful and satisfying.

  • song k.

    star star star star star 13 June 2026

    The most freshest fish sushi place ever! For people that go to AyCE, I prefer quality versus quantity. Yummy!!! Very inexpensive.

  • Lincoln Y.

    star star star star star_border 13 June 2026

    We were taken there by a friend of us and we'll sure come back. We ordered 2 boats that night lol. Everyone was so full.

  • Chris J.

    star star star star star 2 June 2026

    I have been coming here for years, so it's an overdue review.  I usually don't get the on menu items but sushi bar.  Tommy the chef is awesome!

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