Homestead Crater: The Warm-Water Hot Spring Hidden Inside a Utah Limestone Dome

You do it inside a rock. Homestead Crater in Midway is a 65-foot-deep geothermal spring sealed inside a 55-foot beehive dome of limestone, and it is the only warm-water scuba certification site in the continental United States. The water holds steady between 90 and 96 degrees all year, so while the rest of the country trains divers in cold quarries and colder oceans, Utah trains them in what amounts to a giant mineral bath with a hole in the roof. You can swim it, snorkel it, dive it, or do yoga on a paddleboard in it. You cannot just show up — and that is the first thing worth knowing.

What Homestead Crater actually is

Picture a beehive turned to stone. The dome rises about 55 feet off the valley floor and spreads roughly 400 feet across at its base, built entirely from minerals that hot water carried up and left behind, layer on layer, over about 10,000 years. Inside is the spring: water that fell as snow on the Wasatch, sank two miles down, got heated by the earth, and rose back up dissolving limestone the whole way. What it left on the surface is the dome you see. What it kept underground is the pool you climb into.

That pool is deep — around 65 feet from the surface to the top of the silt, with another 8 to 14 feet of soft sediment below that. A shaft of daylight pours in through the original opening at the crown of the dome, hits the water, and turns it a lit-from-within blue-green. It is one of the strangest and most beautiful interiors in Utah, and for most of its life almost no one could get inside it.

A Swiss farmer, a hot pot, and a stick of dynamite

The valley’s settlers called these geothermal springs “hot pots,” and the biggest one sat on farmland that Swiss immigrants Simon and Mary Schneitter bought in the 1880s. In 1886 Simon uncovered the spring that would become the Crater, and before long the couple was inviting neighbors to soak. Schneitter’s Hot Pot Resort grew out of a farm and a good idea, and the Homestead resort that surrounds the Crater today traces its roots straight back to it.

For a century, though, the Crater was hard to enter. The only way in was down through the hole at the top. That changed in 1996, when a crew led by Jerry Simons used dynamite and a team of miners to blast a horizontal tunnel through the base of the dome, then carved out the interior and added changing rooms. What had been a dramatic but nearly inaccessible curiosity became a place you could walk into on level ground. The tunnel is why the Crater works as a commercial spring at all — and why a beginner in a wetsuit can be underwater inside a mountain twenty minutes after parking the car.

Why divers fly in for it

Here is the fact that puts Homestead Crater on maps far outside Utah: it is the only warm-water scuba certification destination in the continental U.S. Everywhere else in the lower 48, open-water training happens in cold lakes, flooded quarries, or the ocean, where the cold shortens sessions and rattles nervous first-timers. The Crater stays in the low 90s year round and runs about 65 feet deep — warm enough to be comfortable, deep enough to satisfy certification standards. Dive shops across the Intermountain West use it to certify new divers and check out instructors, and people travel from cold-winter states specifically to train somewhere that feels like a bath.

You do not have to be a diver to get in. Swimming and snorkeling are open to almost everyone, and paddleboard yoga on the warm water has become one of the Crater’s signature draws. Every person who enters the water wears a life vest for the full session — the resort provides them in sizes from infant to XXXXL — because the pool is deep, the sides are rock, and there is no shallow end to stand in.

What it costs and how to visit in 2026

Reservations are mandatory. Sessions run in 60-minute blocks with roughly 40 minutes of actual in-water time, and they sell out, so walk-ins are generally turned away. Book online ahead.

As of 2026, swimming and snorkeling run $15 per person on weekdays, Monday through Thursday, and $18 on weekends and holidays for anyone 8 and older. Kids 3 to 7 are $12 on weekdays and $15 on weekends, and children under 3 are free. Scuba diving is $25 per person on weekdays and $30 on weekends. The Crater is open for swimming from 8:30 a.m. to 10 p.m. and for diving until 8 p.m. Bring a towel and water shoes; the resort handles life vests and, for divers, gear and guides.

Midway sits in the Heber Valley about an hour from Salt Lake City, which makes the Crater an easy add-on to a Park City or Provo trip. And because the whole thing happens inside a dome, it is one of the few Utah outings that does not care whether it is snowing, storming, or a hundred degrees outside.