Mermaids in Texas? You bet your boots. Every May, San Marcos transforms into a whimsical, water-loving wonderland where cowboy hats meet seashell bras and parade floats ripple with scales and sparkle. Dubbed the Mermaid Capital of Texas, this Hill Country town doesn’t just dip a toe in the fantasy—it dives in headfirst. The annual Mermaid Fest is part environmental call-to-action, part cultural celebration, and 100% Texas charm. And now, I need to go and check this out!

What is the Mermaid Capital of Texas Fest?

So what exactly goes down when mermaids take over a Texas town? From May 9–18, 2025, San Marcos will be swimming in festivities as the Mermaid Capital of Texas Fest returns with its signature mix of parades, live music, art markets, and all-out river revelry. From dazzling costumes to community spirit, this fest is where scales, sequins, and Texas pride collide.

The roots of the Mermaid Capital of Texas Fest run deeper than the San Marcos River. Inspired by the Aquamaids of Aquarena Springs—a beloved mid-century attraction where women performed synchronized swimming in glass-bottom tanks—San Marcos embraced its mermaid legacy as both folklore and local pride. In 2021, the Texas Legislature made it official, naming San Marcos the Mermaid Capital of Texas.

What began as a tribute to quirky history has grown into a full-blown celebration of art, community, and environmental stewardship. Today, the festival spans multiple days, bringing together locals and visitors for a vibrant lineup of events that celebrate everything from river conservation to Texas creativity.

Whether you're a local Texan or a first-time visitor, the Mermaid Capital of Texas Fest is an experience like no other. So, grab your best mermaid-inspired outfit, pack some sunscreen, and dive into the festivities. You won’t want to miss the magic of mermaids in the heart of Texas! Check out all the activities here.