Most people come to Door County for what’s above ground. We had the chance to explore what’s underneath it. With more than 40 known Door County caves beneath the peninsula, there’s another side to this popular Wisconsin destination that most visitors never get to see.
For just two days each summer, Door County Parks offers public tours of Horseshoe Bay Cave near Frank E. Murphy Park in Egg Harbor. At more than 3,100 feet long, Horseshoe Bay Cave is the second-longest known natural cave in Wisconsin.
The catch? This isn’t your typical cave tour.
There are no paved paths, railings, or lights. Instead, you put on a helmet, knee pads, gloves, and rubber boots and follow experienced guides into a cold, wet, muddy cave where much of the tour is spent crawling.
We had the chance to take one of the public tours, and it was easily one of the most memorable adventures we’ve had in Door County.
Here’s what to expect if you want to explore Horseshoe Bay Cave yourself.
What Is Horseshoe Bay Cave in Door County?
Horseshoe Bay Cave is a natural cave located near Frank E. Murphy Park in Egg Harbor, Wisconsin.
The cave stretches more than 3,100 feet, making it the second-longest known natural cave in Wisconsin behind Crystal Cave near Spring Valley. It was formed by an underground river and is one of more than 40 known caves beneath the Door County peninsula.
That alone makes this part of Door County fascinating. Thousands of people drive, bike, hike, and vacation across the peninsula without realizing how much is happening beneath their feet.
Door County has owned the first approximately 400 feet of Horseshoe Bay Cave since 2011. A management plan helps protect its geology and bat populations, and access to the cave is tightly controlled.
Most of the year, the entrance is gated. Visitors can walk to the entrance and look inside, but entering the cave is prohibited without authorization.
Horseshoe Bay Cave Public Tours
The opportunity to actually enter Horseshoe Bay Cave is rare.
Door County Parks typically opens the cave for public tours during a two-day event each summer. Tour dates can change from year to year, so check with Door County Parks before planning a trip around the experience.
Groups are led into the cave by experienced guides, with participants traveling single file through the cave’s narrow entrance.
Tours cover approximately 400 feet and take about 45 minutes. Although 400 feet may not sound far, we were not disappointed. You work hard to explore this distance.
That doesn’t sound like a particularly long distance until you realize how you’re traveling those 400 feet.
What to Expect Inside Horseshoe Bay Cave
This is not a walk-through cave tour.
Much of the experience involves crawling on your hands and knees through passages with ceilings only about three to four feet high. The ground is rocky, wet, and muddy, and once you’re away from the entrance, it is completely dark without your headlamp.
The temperature inside stays around 55 degrees.
We knew all of this before entering, but knowing you’re going to crawl through a cave and actually finding yourself underground in a narrow passage are two very different things.
There were definitely moments when the tight spaces got our attention.
But that’s also part of what made the experience so memorable.
It feels like actual caving rather than walking through a cave attraction built for tourists. You’re getting dirty, squeezing through natural passages, and seeing a part of Door County that relatively few visitors ever experience.
Exploring Beneath Door County
Once underground, you get a completely different perspective on Door County.
Horseshoe Bay Cave contains narrow passages, larger rooms, underground water features, and rock shaped over thousands of years by water moving beneath the peninsula.
Your headlamp becomes your view of the cave. Everywhere else is completely dark.
That darkness was one of the things that stuck with us most. Above ground, you’re near one of Door County’s popular waterfront parks. Underground, the shoreline, roads, boats, and summer crowds feel very far away.
It is hard to believe this entire cave system exists beneath a place so many people visit every year.
Is the Horseshoe Bay Cave Tour Difficult?
The public tour isn’t technically difficult in the way that rock climbing or vertical caving would be, but it is physically demanding.
Expect to spend much of the tour crawling on your hands and knees. You’ll encounter uneven rocks, mud, water, low ceilings, and narrow spaces.
Door County Parks does not recommend the tour for anyone who is claustrophobic, has limited mobility, or is prone to anxiety in confined spaces.
There is currently a minimum age of 6 for participants.
We wouldn’t underestimate the confined spaces, either. Even if you’re normally comfortable with caves, crawling through a passage only a few feet high feels very different from walking through the large chambers found on many commercial cave tours.
For us, that challenge was part of the adventure.
Is Horseshoe Bay Cave Worth Visiting?
Absolutely, especially if you enjoy the more adventurous side of exploring Wisconsin.
We’ve visited Door County many times, and experiences like this are a reminder that there is always something new to discover on the peninsula.
Horseshoe Bay Cave isn’t polished or designed to be comfortable. It’s wet. It’s muddy. The passages are tight. And at some point, you’ll probably wonder how you’re going to get all that mud out of your clothes.
That’s exactly what makes it such a memorable experience.
If you’re comfortable with confined spaces and don’t mind getting dirty, this is one Door County adventure worth planning around. This is an epic wisconsin experience!
How to Visit Horseshoe Bay Cave in Egg Harbor
Horseshoe Bay Cave is located in the open field across from Frank E. Murphy Park at 7119 Bay Shore Drive in the Town of Egg Harbor.
Public access inside the cave is limited to scheduled tours. When tours aren’t being offered, visitors can still walk to the gated cave entrance, but you cannot enter the cave.
Because public tour dates and requirements can change, check directly with the Door County Parks Department for the latest information before visiting.
Horseshoe Bay Cave: Know Before You Go
- Location: Across from Frank E. Murphy Park, 7119 Bay Shore Drive, Egg Harbor, Wisconsin
- Tour length: Approximately 45 minutes
- Distance: Approximately 400 feet
- Conditions: About 55°F, wet, muddy, rocky, and completely dark away from the entrance
- Difficulty: Expect extensive crawling on hands and knees through passages approximately 3–4 feet high
- Minimum age: 6 years old
- Gear: Door County Parks currently provides helmets with mounted lights, knee pads, gloves, and rubber boots
- Clothing: Wear clothes you don’t mind getting wet and muddy, and bring a complete change of clothes
- Facilities: There is no running water at the cave tour site. A portable restroom is available.
- Public access: The cave is gated and closed to general entry outside authorized tours.
- Always check current tour dates, requirements, and availability with Door County Parks before making the trip.
WeWisconsin Tip:
Bring more than just a change of clothes.
Pack towels and a large trash bag or waterproof tote for everything you’re wearing inside the cave. You are going to come out muddy and wet, and having somewhere to put all that gear makes the ride home much easier.