In-N-Out Burger

In-N-Out Burger In-N-Out Burger is a popular burger and fast food restaurant located on Grand Avenue. Known for their commitment to using only the freshest ingredients, they offer juicy 100% beef patties grilled to order, hand-cut fries, and shakes made with real ice cream. The menu features classic options such as hamburgers and cheeseburgers that are sure to satisfy any burger craving. Whether it's lunch or dinner time, In-N-Out Burger delivers quality you can taste® anytime you visit.
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Recent social media posts

06/22/2026

Summer is officially here! Whether you’re chasing longer days, golden sunsets, or late-night fun, we’re here to serve you quality burgers made with the freshest ingredients all summer long!

Our 2026 T-shirt is now available in white! Shop now at shop.in-n-out.com.
06/15/2026

Our 2026 T-shirt is now available in white! Shop now at shop.in-n-out.com.

Golden hour hits different at In-N-Out®! ☀️
06/14/2026

Golden hour hits different at In-N-Out®! ☀️

We’re excited to welcome you to our newest location at the BLVD on the Las Vegas Strip! This restaurant features special...
06/09/2026

We’re excited to welcome you to our newest location at the BLVD on the Las Vegas Strip! This restaurant features special design touches and an on-site In-N-Out Burger® Company Store for a unique experience. We look forward to serving you our classic menu of quality burgers, fries, and drinks.

Fresh fries and summer vibes.
06/07/2026

Fresh fries and summer vibes.

05/28/2026

At In-N-Out®, we serve only fresh, never frozen, high‑quality ingredients. Every burger is made one at a time, fresh to order. Celebrate National Hamburger Day with a classic!

05/28/2026

During this time of remembrance and gratitude, we are honored to bless 10 families of fallen heroes who shared their courageous stories on our tribute wall with 365 days of In-N-Out Burger® by offering them 365 complimentary meal cards. Blessing these families is a small but sincere gesture for the ultimate sacrifice our fallen heroes made in serving our country.

Visit INOsalutes.com to show gratitude to our fallen heroes by reading their stories on our tribute wall.

05/25/2026

Today and every day, we honor those who gave the ultimate sacrifice in service to our country.

Visit INOsalutes.com to share your gratitude and read the courageous stories on our tribute wall.

05/18/2026

Show gratitude to our fallen heroes and share their courageous stories on our tribute wall. With Memorial Day approaching, we would be honored to bless a family of a fallen hero during this time of remembrance and gratitude, with 365 days of In-N-Out Burger® by offering them 365 complimentary meal cards. Each tribute submitted will be respectfully entered for a chance to receive this special opportunity; a small but sincere gesture for the ultimate sacrifice our fallen heroes made serving our country. For more details, visit INOsalutes.com.

NO PURCHASE NECESSARY VOID WHERE PROHIBITED. Odds depend on entries received. Ends 5/25/2026 11:59pm PT. Rules: INOsalutes.com

Address

583 Grand Avenue
San Marcos, CA
92078

Travel Directions:
- If you are traveling by public transport, you can take the bus and get off at Grand Avenue Station.
- If you are driving, take Highway 78 and exit at S. Twin Oaks Valley Road. Turn left onto S. Twin Oaks Valley Road, then turn right onto San Marcos Blvd and finally turn left onto Grand Avenue.
- There are several parking options available near the restaurant including a parking lot next to the restaurant or street parking nearby.

Opening Hours

Monday 10:30am - 1am
Tuesday 10:30am - 1am
Wednesday 10:30am - 1am
Thursday 10:30am - 1am
Friday 10:30am - 1:30am
Saturday 10:30am - 1:30am
Sunday 10:30am - 1am

Telephone

+18007861000

Website

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What people say

Burger restaurants are a staple of American cuisine, and In-N-Out Burger on Grand Avenue in San Marcos is no exception. What sets this burger joint apart from the rest is their commitment to quality ingredients and old-fashioned cooking methods. From the moment you take your first bite of their juicy 100% beef patty burger, you can taste the difference that fresh, high-quality ingredients make.

In-N-Out Burger has been serving up delicious burgers since 1948, and they haven't strayed from their commitment to quality since then. Their burgers are grilled to order, ensuring that each one is cooked to perfection. The buns are freshly baked, adding an extra layer of flavor to every bite. And let's not forget about the fries - hand-cut from whole potatoes and perfectly crispy.

But it's not just about the food at In-N-Out Burger - it's also about the experience. The staff is friendly and efficient, making sure that your order is exactly how you want it. And if you're in the mood for something sweet, their shakes made with real ice cream are a must-try.

Overall, In-N-Out Burger on Grand Avenue in San Marcos is a top-notch burger restaurant that truly lives up to its motto of "Quality you can taste®." If you're looking for a delicious meal made with fresh ingredients and served with a smile, look no further than In-N-Out Burger.

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