Mystery Cave
Minnesota, 48°F inside, from $15
48°F
inside, all year
Niagara Cave
Harmony, MN
1 hr
on the main tour
A Minnesota cave with one-hour guided tours of about a mile underground, past fossils, an underground stream and waterfall, and a wedding chapel.
The story
The cave is family-owned and offers guided tours through natural canyon-like passageways sculpted by water from an underground stream. Visitors can discover fossils approximately 450 million years old and travel nearly 200 feet beneath the surface. The cave features an underground waterfall and a subterranean wedding chapel. It is open seasonally, with tours available from May 1st through November 1st.
History source: niagaracave.com.
What you'll see
- Underground waterfall
- Subterranean wedding chapel
- Fossils ≈450 million years old
- Underground stream
Tickets and timing
- How long it takes
- 1 hour
- Hours
- Daily May 1–November 1, plus select days in November.
- Booking
- Reservations recommended; book online or call 507-886-6606.
Getting around underground
- The walk
- About 1 mile underground.
- Wheelchairs
- Wheelchairs cannot be used on the tour due to multiple sets of stairs; however, gemstone mining and 9 holes of mini-golf are wheelchair accessible.
- Strollers
- Strollers cannot be used on the tour.
Dogs, weather and what to wear
- Dogs
- Pets are not allowed in the gift shop or cave. Pets are welcome on the grounds but must be leashed or physically restrained. Certified service dogs are allowed.
- Temperature
- 48°F (9°C)
Good to know
- Best time to go
- Open 7 days a week from May 1st through November 1st; reservations are recommended due to limited availability.
- Photos
- Photos are allowed, but tripods are not.
- Food and drink
- Food and drinks are not allowed (unless there is a medical necessity).
- Wildlife
- Niagara Cave is not a bat habitat.
- On site
- gift shop, mini golf, gemstone mining
Getting there
29842 County Road 30, Harmony, MN 55939
Parking: Free parking
- Minneapolisabout 118 miles
- Madisonabout 137 miles
- Des Moinesabout 155 miles
Distances are straight-line from each city center.
Before you go
- Parking is free and the road in is paved.
Questions people ask
How long does a visit to Niagara Cave take?
1 hour
How cold is it inside Niagara Cave?
48°F (9°C).
Can you visit Niagara Cave in a wheelchair?
Wheelchairs cannot be used on the tour due to multiple sets of stairs; however, gemstone mining and 9 holes of mini-golf are wheelchair accessible.
Are dogs allowed at Niagara Cave?
Pets are not allowed in the gift shop or cave. Pets are welcome on the grounds but must be leashed or physically restrained. Certified service dogs are allowed.
Do you need to book Niagara Cave in advance?
Reservations recommended; book online or call 507-886-6606.
Where is Niagara Cave?
29842 County Road 30, Harmony, MN 55939
Checked on 2026-10-22 against niagaracave.com (home and hours pages). Prices and hours change, so confirm on the official site before you drive out.