It's In- N-Out, so you know it's good! This location is one of the old school locations, where it's mainly a drive through with minimal seating outside. It's old school charm. That being said, the lines for the drive through can get very long during lunch time. It's does move along relatively quickly though. Service here is excellent, as are all In-N-Outs. Staff is super friendly and efficient. You can tell each person is well trained in customer service. Burger, fries and drinks are of high standard - not surprising. It's a simple menu, but it's all done the right way. In-N-Out is a place you can count on to deliver good food and service. read more

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I've been to countless In N Out locations throughout Los Angeles, Corona, Riverside, Las Vegas and Walnut and this location was my least favorite. The drive thru experience was terribly slow. There are two lanes in a very compact space right off the main road where lots of cars were waiting. The food was average for a in n out restaurant and the burgers were tasty but given that I waited nearly 40 minutes when there was only 3 cars ahead of me was the indicator to go to the Walnut location for better convenience. read more

Great service! Everyone at this location is always so friendly Great food everything is always delicious Parking is limited but it's nice to seat and enjoy the food. read more

In-N-Out Burger - Burgers Near Me - Diamond Bar, California

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There is only two cars in front of me took around 30 minutes to get my food. On top of that the worker Brendan sounded very annoyed. Give me an eye roll because I wanted to add french fries to my order. Not really sure what his problem is. There's not really an ambience. It's just a drive-through location. read more

In-N-Out Burger - Burgers Near Me - Diamond Bar, California

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We came here late on a Friday (technically it was Saturday 1:23am) right before they closed. We only ordered two rootbeer floats and a fry. Considering the fact that we arrived there about 7 min before closing, the two gentlemen were still beyond friendly and nice. The one making our floats even chitchat with us while making our drinks. Thank you for being so nice despite us coming right before closing! read more

This In N Out is small and does have limited parking. However, there is a seating area outside for enjoying a meal with friends! The service was good for a good group of us and food quality is still good in comparison to others. Tips: There's 2 restrooms on the side and a more obscure way to get from the ordering side of In N Out to the tables. For parking, there's about 9-10 spots of parking and then the rest would need to be on the street! read more

In-N-Out Burger - Burgers Near Me - Diamond Bar, California

This is a very small In N Out Burger place. Service is excellent and burgers and fries are fantastic. For decades people parked right across from the walk up window in what was thought parking that belongs to In N Out in Diamond Bar California. Today the gas station put up signs kicking out the In N Out patrons. After our meal... our group from church would always gas up at this gas station. Not no more. read more

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I love this in-n-out. All of them are good honestly, they NEVER mess up your order. I've been coming since I was a kid and I have never had a messed up order. Also just a shout out tonight I went and obviously it's a Friday night so everyone and their mama is here and Branco is out taking orders on the hand held and getting through the line quickly but effectively and doing it with a smile on his face. So polite, so friendly and so attentive. Love it! read more

In-N-Out Burger - Burgers Near Me - Diamond Bar, California

Hmmmm.. . Why is this particular In-N-Out always struggling with the attitudes or immature games!!?? Several friends have experienced issues at this location. The manager seems to either not care or he also is lost in the sauce!! lol .. no pun intended. Every other In-Out Burger has their program and training University at "top notch" level! I think i will drive a little farther out to another location. This location seems to ALWAYS dissapoint! read more

Hands down amazing service and delicious food. Normally my in n out order is pretty complicated but I think the workers in the front and the cooks nailed it. Josh was the gentlemen who helped me and even went out of his way to give me the restroom code after closing. Will definitely be returning! read more

Wayyyy too long of a wait for a number 2 combo. 25 min it took on my 30 min lunch with the same two cars in front of me. Food was great, wait time is horrible. read more

Very congested parking lot, holy moly. Waiting outside the parking lot with no way in. The drive thru line runs immediately out onto the street and slowly. Guess no lemon ice water for me this time D-: read more

Worsr in n out. Takes forever to get your order. I wish there is another in n out nearby

Been going here for awhile and it's consistent in pricing and speed no matter what the line looks like. 5 stars.

Service is terrible the lady gave me so much attitude when I asked for a box and spread and just had somebody else help me.

Classic In and Out with the traditional drive thru setup. The service is always wonderful at this location, but peak hours can be a pain getting your car in from the road. read more

This is the best burger in California .the service is fast and good quality . The area is good also.

Drive through only. But still classic, delicious in-n-out taste with fresh veggies and toasted bun. Fries, requested light, were cooked soggy as ordered. Employees did a good job moving along the car lanes smoothly. No issues with service. Employees were all friendly. read more

In-N-Out Burger - Burgers Near Me - Diamond Bar, California

Went there 3 times, and all 3 times my order was incorrectly made. I called into to In n Out corporate all 3 times and they generously sent gift cards and advised they would follow up with the store. I went today hoping for a change, considering corporate told me they would address it, and it was even worse than the last 3 times. I ordered a grilled cheese plain, just like corporate asked me to request during my prior calls to them, and the rep gave me a protein style cheeseburger instead. I don't know about you, but I have never heard of a grilled cheese plain with lettuce instead of a bun. She asked me twice "you want a grilled cheese protein style". And I told her twice "no, I need a grilled cheeseburger plain combo with a lemonade". And guess what? I got a protein style grilled cheese lol. What a surprise, merry Christmas to me I guess. I also ordered a hamburger plain, like the previous 3 times, and I got a hamburger with grilled onions. Fyi these are for my kids, so they're very picky. I know that I can easily go to a different in n out but it you live in my area, you know this in n out is the only one within 10 miles that is not busy. All of the other in n outs have lines accross the neighborhoods. I should have checked the bag this time around, but I was there on my lunch break while on a teams meeting. It was just a mess and I hope that their staff can understands the basics of just making a simple GRILLED CHEESE PLAIN. I won't be returning to this specific in n out, I suggest you go elsewhere to avoid getting the wrong order or something pushed onto you that you don't want. Just for reference if their stores sees this, this is a grilled cheese plain read more

In-N-Out Burger - Burgers Near Me - Diamond Bar, California

Poor service and wrong order twice. Told them they messed up my burger and fries, handed me back the same fries and a wrong burger again. Didn't want to ask again so I took the meal and best part of my meal was my soda. 10:40pm on Monday. Rude girl doing fries as well. Not very welcoming, won't be back. They weren't even busy! read more

Def the worst the of the chains Food takes forever and doesn't taste as good as the others read more

I usually love coming here, but when I came today, it was such a mess. I pulled up, they got my order wrong. When they read it back to me on the intercom it was right. I ordered a lemon up, I got a lemonade and when they handed me the lemonade, the straw cover was completely soaked and the person handing it to me started messing with it and was rubbing off the wet paper on it. I asked for everything in a bag and they handed me a box. I previously asked for 3 spreads and they only gave one and when I asked again, they looked so mad about it. I ordered a double double with chopped chili and grilled onions and they gave me a whole onion and no chilis. They took so long giving me my order when I was at the window, and yet, everything was cold when I got it. I usually come here because it's closest to my house but I'd rather drive somewhere else than come back here. read more

If you think Costco gas lines and DMV lines are long, then you have no idea how long the lines can really be. This In N Out is more like In Stuck Forever and NEVER Out! You have to wait in your car so long that you eventually turn into a mummy getting baked in the hot sun while waiting for a burger. Also just burned half a tank of gas while waiting so that $6 burger now costs $30. Seriously bad! read more

I ordered a cheese burger, no onion, milk shake and fries this afternoon for my son. The guy asked me whether I wanted it in the box I said no. The guy even confirmed my order. But I still got everything in the box. After got home I checked it, it did have the onion, and no bread. For my last more than 20 years with in & out,I've never experienced this before. Besides I am Asian, I hope this is not discrimination. read more

Yum....always good and fresh. Small location based on original design. Double sided drive through and walk up window. No indoor seating, limited outdoor tables. Very limited parking in their lot, the shell station doesn't like you parking there, but we all do. read more

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In n out is the best, haters gonna hate. Best price and quality. Whateverburger, Smashwallet etc all just can't compare. You get a fresh burger that doesn't make you feel like you've eaten at a Shack and you didn't break bank doing it. We came to In N Out before a day outing and it was the perfect start to our day. This location doesn't have indoor seating.. Just two fast drive throughs and some outdoor seating. I got my first In N Out burger from this location with a school certificate for doing something good. Treated that burger to my dad and he said it was the best burger he ever had. read more

In-N-Out Burger - Burgers Near Me - Diamond Bar, California

They take too long even when there's barely people they lag on taking your order and had me waiting

I've been waiting for dinner for over 30 minutes and the line has barely moved. We're hungry, tired, and the drive-thru line is overflowing into the street. I genuinely don't understand who thought making this location drive-thru only was a good idea, especially with only a tiny sign mentioning walk-ups. If I had known earlier, I would've gone somewhere else instead of being stuck in this line with no easy way to leave or find parking. Really frustrating experience. This location needs to do better with organization and signage. read more

This is kind of a unique in n out. This is mostly a drive thru as the location is smaller than the usual ones. There is a small outdoor eating area and small parking lot so take care in parking. I did knock it down a star due to the longer wait time I experienced when I ordered at the window. If you want in n out and just want a drive thru this is the spot. read more

incredibly long wait time in the drive through for what i thought was a shorter line. food was fine but customer service is so slow.

This In-N-Out may be small, but they have good and fast service, and the burgers usually have good quality. Sometimes when the line is extremely long, it may take a while, but at the end, you'll get a great burger! Would recommend! read more

In and out is always delicious!! The service is always fast. The staff is friendly at this location. They also give free hot chocolate on a rainy day for kids. Love it!! read more

In-N-Out Burger - Drink menu - Burgers Near Me - Diamond Bar, California

Just a PSA, check your order and receipt. I never had problems with INO before so today was a surprise. Food was incorrectly made (never happened before!). Also, said "no" to the donation but found out they added in a donation without my consent. Not sure what happened to this location. Thankfully, corporate was apologetic, but hope this location gets more training. read more

You can honestly never go wrong with In-N-Out. For $3 burgers and fries made from the finest, freshest potatoes, I can never get tired of eating here. Their burgers are always made with the freshest ingredients of tomatoes, lettuce, cheese, pickles, and beef. Fries always come out crispy and hot! My go-to order is their cheeseburger with animal style, chilis on the side, and spread. I AM A LOVER OF IN-N-OUT and really appreciate their burgers always being made with fresh ingredients. Their NEAPOLITAN SHAKE is also yummy, creamy goodness. It is a mix of vanilla, chocolate, and strawberry and is delicious ~ Not to mention, their service is always exceptional and I always come out happy and full (-: read more

In-N-Out Burger - Double double, French Fries, and Cheeseburger with Animal Style - Burgers Near Me - Diamond Bar, California

TLDR: Traditional In-N-Out burgers, friendly staff, long wait times. (Be prepared to wait, or try to find when the least busiest times are.) Quality control is also a concern after a second visit. In-N-Out is always an easy go-to for late night munchies, and it's no different in any city. Having driven home in about an hour, I was finally ready to get a quick snack, and I visited this location. Of all the In-N-Outs available, this one easily ranks as one of the best in terms of service. I went through the drive-thru line, and I have to admit that the reviews are correct at the snail paced wait times, but with only 4-6 people working in a small kitchen, they really are working as fast as they can. While waiting, the staff were open to quick conversation and also enjoying their work inside, which warmed my heart. Although I was 3rd in line, the wait for my food was may be 10 minutes, but I didn't expect the wait to really be worth it until I arrived home. I ordered my classic double double with a side fries. Lo and behold upon opening the bag, I found that they really stuffed my fries, and from this experience, I'm definitely going to make it a regular for me after finding out when the least popular times are, of course. ------ I visited a second time the following week, and the food was lukewarm. I'm at a loss of words at how great quality changed in two weeks. read more

In-N-Out Burger - Double Double with Fries - Burgers Near Me - Diamond Bar, California

I honestly don't do this often, and I've lived in diamond bar for 20+ years, order $30 worth of food here, didn't get the order right, didn't get the soft drinks right, ask for spread drove off and there was no spread, my fault for not checking... But if you're making $30 in less than 10 minutes you could at least get something right... read more

I really enjoyed this location! I had never seen an In N Out set up like this. There is no indoor restaurant/way to order. It's mainly for drive through, and there are two drive through lines. There is also an option to park and do walk up ordering and eat at their patio tables outside, which is what I did. There are two unisex bathrooms outside, which you need a code for. The bathrooms are very clean. There are two driveways. One to park, and one for drive through. They are separate and do not connect. I love the double double with onion. My friend loves the cheeseburger, animal style. The fries are nice and not greasy. The staff is extremely friendly and helpful. I would definitely come back to this location. They make everything fast and easy. read more

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rude service , extremely high wait time for two burgers, no sense of urgency, they barely acknowledge you

I haven't been In & Out burger for a long time. When I went in this evening, I was surprised that there was no line at all. About 60% of people dine in the restaurant. I ordered one hamburger, one cheeseburger, and one cheeseburger in protein style for myself and my parents. After the first bite, I felt something was different. I looked inside the burger and saw a super thin, tiny beef inside and it was kind of dry (maybe it's too thin compared to the past and overcooked a bit). This is not the In & Out I used to go to. This is not the juicy burger I used to eat. I don't know if only because of this location or they all changed! read more

In-N-Out Burger - Hamburger (only half in the photo) - Burgers Near Me - Diamond Bar, California

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Sometimes a good American style burger and fries is all you need to make it through the day. I love In N Out and have been a fan of their establishment since my college years. My favorite is just a simple hamburger protein style which is without a bun and lettuce wrapped instead. Also, I like their spread that is inside the burgers and if you want to get an animal style fries it's also on top of the fries. The lines here are long and expected since so many other people love this place too! If you want some more spread on your burger or fries you can ask them to give you a packet of that instead of ketchup, that's what I usually do. Enjoy! read more