Caves and Karst Day

Caves and Karst Day is observed every year on June 6. In 2026, this date falls on a Saturday. The day focuses on caves, caverns, sinkholes, springs, underground streams, and the karst landscapes that shape them. It is a nature and education observance tied to safe cave visits, groundwater awareness, and careful treatment of fragile underground spaces. For families, students, travelers, and geology enthusiasts, it turns a hidden part of the landscape into something easier to understand and respect. ^{1 2}

See also: National South Dakota Day, National Missouri Day, National Arkansas Day

History of Caves and Karst Day

Caves and Karst Day began in 2017 and is associated with the National Caves Association, an organization connected with show caves and public cave education. The observance was created to draw attention to the role caves and karst landscapes play in the environment and in everyday life. Its focus is practical rather than ceremonial: helping more people learn what caves are, how karst forms, and why underground ecosystems need protection. The date is fixed on June 6 each year.

Long before the modern observance, caves held scientific, cultural, and environmental importance. Many caves form when groundwater moves through cracks in soluble rock, gradually widening passages and chambers over long periods of time. Karst landscapes can include sinkholes, disappearing streams, springs, aquifers, and cave systems, all connected by the movement of water through rock. Today, Caves and Karst Day links that geological story with public education, cave tours, classroom lessons, and conservation-minded outdoor recreation.

Why is Caves and Karst Day important?

Caves and karst landscapes are easy to overlook because much of their value is underground. Karst aquifers store and move large amounts of water, and in the United States they are an important source of drinking water. Because water can move quickly through cracks and conduits in karst, pollution at the surface can affect springs, wells, streams, and cave habitats below. Learning how these systems work helps communities understand why land use, litter prevention, and water protection matter.

The day also supports curiosity about science and the natural world. A guided cave visit can make geology feel immediate: visitors see rock layers, formations, flowing water, fossils, and underground habitats instead of only reading about them. Caves can also be fragile, with formations that may take centuries or longer to grow and wildlife that depends on stable darkness, moisture, and temperature. Caves and Karst Day gives people a reason to enjoy these places while treating them with care.

• It makes underground landscapes easier to notice.
• It connects cave visits with real earth science.
• It supports better care for groundwater.
• It teaches respect for fragile cave formations.
• It helps families find educational outdoor experiences.

How to Celebrate Caves and Karst Day

Visit a local show cave, cavern, nature center, state park, or geology program that offers safe public access. Guided tours are the best choice for most visitors because trained staff can explain cave formation, point out delicate features, and keep people on approved paths. Students can use the day for a classroom project about limestone, sinkholes, aquifers, fossils, or cave animals. At home, families can watch a documentary, read about a famous cave system, or map karst regions in their state.

Good cave etiquette matters as much as curiosity. Stay on marked trails, avoid touching formations, follow all guide instructions, and never remove rocks, fossils, animals, or cave material. People who live in karst areas can also mark the day by learning how stormwater, septic systems, trash, fertilizers, and chemicals can affect groundwater. A small amount of care above ground can help protect the hidden water and habitats below.

• Book a guided cave tour near you.
• Read about karst in your state.
• Ask a park ranger about cave safety.
• Pick up litter near a spring or trail.
• Teach kids not to touch cave formations.

Caves and Karst Day Dates

1. https://cavern.com/how-caves-form/[↩]
2. https://www.usgs.gov/mission-areas/water-resources/science/karst[↩]