Minnesota isn’t the first place most people picture when they think of underground passages, but the state’s limestone and dolomite outcrops create a few interesting caves worth noting. These features range from managed show caves to smaller, less accessible openings that reflect local karst geology and glacial history.
There are 2 Caves in Minnesota, ranging from Mystery Cave to Niagara Cave. For each entry, data is organized with County/nearest town, Access, Length (m), which you’ll find below.
Are any of these caves open for public tours or visits?
Yes — access depends on the site. Mystery Cave is part of a state park with scheduled tours and visitor facilities, while Niagara Cave offers guided tours as well; other caves may be on private land or seasonally closed, so check each listing’s access notes before planning a visit.
What should I consider for safety and planning before entering a cave?
Treat caves as controlled environments: wear sturdy shoes, bring a reliable light source, follow guide instructions, and respect closures or restricted areas; also verify parking, reservation requirements, and whether a cave is on private property to avoid trespassing.
Caves in Minnesota
| Name | County/nearest town | Access | Length (m) |
|---|---|---|---|
| Mystery Cave | Fillmore County / Preston | Show cave (state park tours) | 21,200 |
| Niagara Cave | Fillmore County / Harmony | Commercial show cave (guided tours) | 610 |
Images and Descriptions
Mystery Cave
Mystery Cave, in Forestville/Mystery Cave State Park near Preston, is Minnesota’s longest known cave (≈13.2 miles, 21,200 m). A limestone karst system with stream passages, stalactites and flowstone. Guided seasonal tours by state park; follow DNR rules and dress warmly.
Niagara Cave
Niagara Cave, a privately owned show cave near Harmony, features an impressive underground waterfall and calcite formations in limestone bedrock. About 610 m of developed passages are open on guided tours year-round; observe owner safety rules and wear sturdy shoes.
