Onondaga Cave State Park
7556 Highway H
Leasburg, MO
One of the finest show caves in a state known for caves, kept public and toured by park guides, on a peaceful bend of the Meramec River.
Missouri is sometimes called the Cave State, and Onondaga is one of the reasons why. Beneath the wooded hills along the Meramec River lies a cave so densely decorated with stalactites, stalagmites, and flowing sheets of stone that it earned the title of National Natural Landmark, a designation reserved for the country's most remarkable natural places. A lit walkway winds through its chambers, and park guides lead visitors past formations that took the slow drip of water hundreds of thousands of years to build.
The cave has been drawing visitors for well over a century. In the early days, sightseers rode the railroad out from St. Louis and finished the trip by wagon, and in 1932 it became one of the first electrically lit caves in the Ozarks. Today the whole thing is a Missouri state park, so the cave that was once a private roadside attraction is kept public, guided, and open to anyone willing to walk down into the cool dark.
What Guests Love
- A cave so full of formations that the federal government named it a National Natural Landmark
- Guided lantern-lit tours of a second cave, Cathedral Cave, for a wilder, less developed feel
- The cool, steady underground air, always around 57 degrees, a welcome break on a hot Ozark day
- The overlook at Vilander Bluff and easy access to float or fish the Meramec River
Worth Knowing
- Onondaga Cave is seen only on a guided tour, offered mainly in the warmer months, so check the park's schedule and plan around tour times
- The main cave tour follows lit concrete walkways and is fairly easy, but there are stairs, and it stays cool underground, so bring a light layer
- There is a small fee for cave tours, standard for a Missouri state park, while the grounds, trails, and river access are free
- Cathedral Cave lantern tours are more rugged and seasonal, a separate ticket from the main cave, and worth checking ahead for
Details
Leasburg, MO
Learn about Onondaga Cave State Park
Inside a National Natural Landmark
Onondaga is what cavers call a live cave, still growing, with water still dripping and formations still forming. The tour route passes towering columns where a stalactite from the ceiling has met a stalagmite from the floor, sheets of flowstone that look like frozen waterfalls, and delicate straws hanging thin as pencils overhead. One famous stretch, the Lily Pad Room, holds pools where thin calcite rafts float on the water like leaves.
It is the richness and variety of these formations that earned the cave its National Natural Landmark status, a recognition given to only a handful of places in Missouri. Concrete walkways and lighting make the route accessible without spoiling the sense of wonder, and because a park guide leads every tour, you come away understanding not just what you are looking at but how many thousands of years of patient dripping water it took to make it.
Two caves, and a river
The park actually holds more than one cave worth seeing. Alongside the main show cave, park staff lead lantern tours of nearby Cathedral Cave in the warmer months, a less developed passage where a big column of flowstone, wind-bent formations, and ancient fossil beds appear in the glow of hand-carried lanterns. It is a rougher, quieter experience than the main tour, closer to how early explorers would have seen a cave, and a favorite for visitors who want something a little wilder.
Above ground, the park runs along the Meramec River, a clear Ozark stream popular for canoeing and fishing. A short trail leads to the overlook at Vilander Bluff, where the land opens up to a long view over the river valley. Between the two caves, the river, and the bluff, the park rewards a full half day rather than a quick stop, and the mix of underground and open-air makes it a fine outing for families.
Visiting Onondaga Cave State Park
The park lies south of the small town of Leasburg, a few minutes off Interstate 44 and easy to fold into a Route 66 drive. The grounds, trails, and river access are free, while the cave tours carry a modest fee typical of Missouri state parks. Tours run mainly in the warmer part of the year and fill up on busy weekends, so it is worth checking the schedule and arriving with a tour time in mind rather than hoping to walk right in.
Dress for the cave rather than the weather outside, since it holds a steady chill of about 57 degrees year round, and wear shoes with grip for the walkways and stairs. Plan on roughly an hour underground for the main tour, more if you add Cathedral Cave or spend time on the river and the bluff trail. It is the kind of stop that turns a highway drive into a real day out, a genuine natural wonder kept public and welcoming in the heart of the Ozarks.
Closest Boutels
The closest Boutel™ stays, so you can turn this stop into an overnight. Each is an independently owned, editorially selected place to stay.
Things to Do Near Leasburg
Cuba Route 66 Murals
About 6 miles
The town of Cuba, the official Route 66 Mural City, painted with a dozen large outdoor murals telling local and highway history, free to walk any time.
Maramec Spring Park
About 15 miles
One of Missouri's largest springs, a vast clear pool beside the ruins of a 19th-century iron works, with a trout stream and shaded picnic grounds.
Meramec State Park
About 18 miles
A large riverside park near Sullivan with more than forty caves, bluff-top trails, and swimming and floating on the Meramec River.
Meramec River
At the park
The clear Ozark river that runs through the park, popular for canoeing, fishing, and lazy summer floats past wooded bluffs.