About Us

We care about black beans. Seriously, we really do. That’s how the Rio all started.

Back around 1986, before handlebar mustaches, sleeve tattoos, and VanLife hashtags were a thing, three hippie friends and brothers from Texas packed up their van, and hopped around Mexico for a while. It was the combination of the good people cooking delicious black beans down there, and the good people with a craving for something different up here, that sparked everything the Rio stands for today.

Black beans not being a crop in Colorado, the three of them brought seeds to a farm in Longmont, and together everything grew from there. Shortly after, the Rio served the first fajita in the Rocky Mountain State. That was a cool day.

So yeah, black beans are pretty special to us. Maybe a little too special, and we wouldn’t have it any other way.

Fajitas, we consider them like you would a first-born child. No pressure, right? Our endless pursuit of the perfect plate of nachos is something we’ll always lose sleep over. Let us know what you think of our new take on them. And, if a day ever comes where we don’t make fresh salsa and fresh tortillas at the start of every shift, that’s the day we close our doors. Locally-sourced is what we were founded on long before everyone was at the farmer’s market. Because there are no shortcuts (we even fired a guy who said he could make the beans quicker).

That long, simple, delicious, journey through Mexico lives on in every dish we have and will ever make. At the same time, our eyes are peeled for the next inspiration to strike on another wild adventure. So, pull up a chair. Lower your guard. Enjoy some damn good TexMex with some damn good people. The only thing you can’t put a fork in is us because we’ll never be done.

Rio Grande Mexican Restaurant has been serving Colorado its own brand of from-scratch TexMex fare since 1986.

Founder and Owner, Pat McGaughran, grew up in Houston, Texas, a city known for its cultural diversity, including a strong Latino community, and TexMex cooking. Living in such a melting pot, McGaughran spent his youth eating plenty of fresh, Mexican food, both at his friends’ homes and out at Houston’s well-known TexMex restaurants.

As young men, McGaughran and his two friends Andre and Stephen Mouton packed up a van and spent extensive time traveling through northern Mexico and the Yucatan, learning more about the culture, and, of course, the food. McGaughran discovered and fell in love with a whole new cuisine, asking for recipes along the way.

After McGaughran’s travels, he settled in Fort Collins, Colorado, and while he loved his new home, he missed the food he enjoyed in Mexico, especially the chile rellenos and the black beans. He began cooking his favorite recipes for friends and even gave black beans to Lucy Stromquist, a nearby farmer, to grow this non-native crop locally.

Shortly after, McGaughran decided to take the leap and open a restaurant, the Rio Grande Mexican Restaurant, in Old Town, Fort Collins, with Stephen and Andre Mouton, where he could introduce his beloved TexMex food (and slow-cooked black beans!) to everyone. That long, simple, delicious journey through Mexico lives on in every dish “The Rio” will ever make.

The Rio quickly became not only an outlet for him to share his passion for Latin culture and food but also a place for guests to have a laugh with friends over a good meal. When guests visit the Rio, they feel a positive, welcoming energy in an environment where they can feel at home and even let loose a little.

The concept was so popular that over the next three decades, McGaughran opened five locations across Colorado, including Boulder, Greeley, Lone Tree, and Denver. Now, as a nearly 40-year-old Colorado icon, Rio Grande Mexican Restaurant is still the state’s favorite spot for fresh TexMex and strong margaritas. However, today’s dining scene is changing.

More than ever, diners are looking for an “experience” rather than just good food on a plate. To better serve this shifting demand, McGaughran has renovated the popular downtown Boulder Rio, to create a more modern environment, with expanded food and drink offerings, including more shareable options.

In Boulder, the Rio was refreshed in 2019 to create a warmer, more modern environment that invites guests to settle in and stay awhile. The updated space features cozier seating, an open kitchen that puts the craft on display, and a reimagined bar surrounded by hand-selected premium tequilas. The result is a space that feels fresh and inviting, while still unmistakably Rio.

In Fort Collins, the Rio faced an unexpected challenge when a fire temporarily closed our flagship location in 2021. After a full kitchen rework and the installation of all new equipment, the restaurant reopened in 2022 with a refreshed look and renewed energy. Throughout it all, a temporary downtown space kept the Tex-Mex flowing, and the fresh made menu and legendary margaritas never missed a beat.

In Greeley, the Rio was also thoughtfully refreshed in 2024, bringing new energy to the space while honoring the roots and character that longtime guests know and love. The updates reflect the same balance found across all locations, familiar, welcoming, and built for gathering.

In Denver, the LoDo location entered a new chapter after relocating from Blake Street to Wazee Street. In 2025, the space was reintroduced as Rio on Wazee, with a more chef driven menu inspired by years of travel and hands-on cooking throughout the Southwest and Mexico. The refreshed menu brings vibrant new dishes and thoughtful refinements shaped by decades of culinary research and development. It is still very much the Rio you know, with a few delicious surprises along the way.

Across all locations, the focus remains the same. Guests can still enjoy the award-winning Classic Rio Margarita, flame-grilled fajitas, house-made tortillas, and slow-cooked black beans that have defined the Rio for decades. Alongside those favorites, new salsas, seasonal dishes, and more interactive menu offerings continue to find their place at the table.

At the bar, patrons can find a full menu of spirits, local craft beer, and 11 fresh margarita varieties. Under the direction of their tequila ambassador, craft tequila-based cocktails offer another new twist on a classic drink style, while still paying homage to the Rio’s history as one of the nation’s largest tequila purveyors with more than 60 hand-selected tequilas and another 17 vault tequilas.

From introducing Colorado diners to fajitas nearly 40 years ago to partnering with local farms for seasonal menus, there have always been new things to experience and enjoy at the Rio. The Rio will always be home to those tasty margaritas, flavorful fajitas, and slow-cooked black beans. Good food done well will always stand the test of time.