Entry No. 32 — the Bozeman file — filed under: history
Lewis & Clark Caverns State Park
One of the largest limestone caverns in the Northwest, toured only on a guided two-mile underground walk through chambers of stalactites, stalagmites, and rare twisting helictites. The caves were dissolved over hundreds of millions of years out of tilted Madison Limestone, and the route involves over 500 stairs down and a slide-through passage at one point. It stays chilly underground even in midsummer, a strange cool world beneath the dry Montana hills.
The story
The punchline to Montana's first state park is that Meriwether Lewis and William Clark never set foot inside it. The Corps of Discovery camped right down along the Jefferson River on July 31, 1805, completely oblivious to the fact that a massive subterranean maze was sitting directly above them inside the dry hills. It wasn't until 1892 that local hunters Tom Williams and Bert Pannel spotted steam rising out of a hole on the ridge during a winter hunt—a natural thermal chimney venting warm air from the darkness below.
What they stumbled onto was hundreds of millions of years of chemical carving in tilted Madison Limestone. Ancient ocean water dissolved the rock seam by seam, leaving behind towering vaults decorated with stalactites, stalagmites, and rare helictites—calcite formations that twist and curl horizontally like stony vines in defiance of gravity. Local entrepreneur Dan Morrison rigged early tours around 1900 with ropes and candles before land battles with the Northern Pacific Railway eventually brought the site into public ownership in the 1930s.
What it's like
You start in the sun-baked, sagebrush hills above the river, but the transition underground is immediate and cold. After hiking up roughly 300 vertical feet to the cave mouth, you drop straight into a perpetual 50-degree chamber. The classic two-mile guided tour is a workout: expect low rock ceilings where you have to duck, narrow squeezes where you might need to take your backpack off, more than 500 descending stairs, and a smooth natural rock slide passage you scoot down on your backside. Bring a thick jacket no matter how hot it is in the parking lot, wear shoes with real tread, and book your summer tour tickets online well in advance—peak season walk-ups get turned away regularly.
The move: Book a summer guided cave tour and wind two miles underground together through twisting limestone rooms kept perpetually cool and dim.
📍 Before you go Cave tours run roughly May through September only and are physically demanding (500+ stairs); reserve tickets ahead in peak season.
- 📍 Whitehall / Three Forks
- 💸 Free
- ⚡ Up for anything
- 🌗 Outdoors
Where: 25 Lewis and Clark Caverns Road, Whitehall, MT 59759
Hours: Added 2026-06-24 — confirm current hours before you go.
⚠ Seasonal or scheduled — always check before you go.
Pair it with
- Bleu Horses — After emerging from the dark underground, look up at the roadside hillside along Highway 287 to catch a herd of 39 oversized blue steel horses frozen mid-graze.
- Headwaters Heritage Museum — Swap damp limestone chambers for a 1910 bank building in nearby Three Forks packed with local historical artifacts and rural Montana oddities.
- Madison Buffalo Jump State Park — Pair the subterranean geology with a towering limestone cliff face down the road where Native peoples stampeded bison for nearly two thousand years.
- Norris Hot Springs — Soothe your knees after negotiating 500 cavern stairs by soaking in a fir-planked geothermal pool held between 100 and 106 degrees.
Good to know
Did Lewis and Clark actually explore the cave system?
No. The expedition camped near the base of the hills along the Jefferson River in 1805, but they were completely unaware the caverns existed.
When are the cave tours available?
Guided tours run seasonally from May through September. The surrounding park trails and campground are open year-round.
How physically demanding is the classic cave tour?
It involves a 300-foot uphill hike to the entrance, navigating low-clearance passages, negotiating over 500 steps down, and sliding through a short stone chute.
What is the temperature inside the caverns?
The interior remains a chilly 50°F (10°C) year-round, so a sweatshirt or jacket is necessary even in midsummer.
Are there bats inside the caverns?
Yes, the cave serves as a summer roosting habitat for Townsend's big-eared bats, though tour routes are designed to protect their quiet roosting areas.
Plan a visit & invite your people →
Further reading: fwp.mt.gov · Wikipedia · explore.com · montanastateparks.reserveamerica.com · Reddit
last checked: 2026-06-24