Entry No. 26 — the Pueblo file — filed under: hot-springs-wellness
The Greenhouse at Sand Dunes Recreation
In the 1930s, oil drillers punched a mile into the San Luis Valley floor and hit 118-degree artesian water instead. Hooper (population about 100) got a family swimming pool out of it — and behind that pool, since 2015, a 10,000-square-foot greenhouse where the rules flip: 21+ only, four soaking pools from 98 to 111 degrees, a ten-person dry sauna, tropical plants everywhere, and the Steel Box bar passing wine and small plates to people soaking in the high desert.
The story
In the 1930s, wildcat oil prospectors punched a drill bit a mile straight into the San Luis Valley floor. They didn't find petroleum; instead, they ruptured a pressurized, 118-degree artesian aquifer that came roaring to the surface. That happy accident gave the tiny desert outpost of Hooper—population roughly 100—a naturally heated public swimming pool that endured for decades.
In 2015, the operators built something far weirder right behind the main family pool: a 10,000-square-foot glass greenhouse structure. Step inside and the high-desert winds vanish, replaced by dense air, lush foliage, and tropical humidity entirely sustained by geothermal water heat. It feels less like rural southern Colorado and more like a stolen slice of the equator dropped onto an arid basin.
The rules change completely at the greenhouse threshold. It is strictly 21-and-over, screening out the splashing crowds out front. Inside, you move between four soaking pools stepped from 98 to 111 degrees, a ten-person dry sauna, and the Steel Box—an onsite bar serving wine and small food plates while you soak under palm leaves.
What it's like
Drive out on County Road 63 and check in at the main Sand Dunes Recreation building. You'll pay standard pool admission plus a separate add-on fee for Greenhouse access, and you must show a 21+ photo ID. Once past the indoor threshold, grab a spot in the 98-degree warm pool before attempting the 111-degree hot soak. The atmosphere is quiet, wet, and sub-tropical. Keep in mind that the facility shuts down one day a week for routine deep cleaning, so always verify their current operational days before making the two-hour drive from Pueblo.
The move: Work your way up the four pools from 98 to 111 degrees, split small plates from the Steel Box between soaks, and finish in the sauna while the dunes glow outside.
📍 Before you go Check in at the main Sand Dunes Recreation building off County Road 63; the Greenhouse is a separate add-on admission on top of regular pool entry and strictly 21+ with ID, even though the outdoor pool out front is family territory. It generally runs walk-in, but the facility closes one day a week for cleaning — confirm before making the roughly two-hour drive from Pueblo. Pair it with Great Sand Dunes National Park about 25 minutes east, or the Colorado Gators reptile park and the UFO Watchtower a few minutes down Highway 17.
- 📍 Hooper
- 💸 $$
- ⚡ Low-key
- 🌗 Indoor or outdoor
Where: 1991 County Road 63, Hooper, CO 81136
Hours: Added 2026-06-11 — confirm current hours before you go.
Pair it with
- UFO Watchtower — Located under two miles away in Hooper, this metal viewing tower offers a cosmic, high-desert palate cleanser right down the road from your tropical soak.
- Colorado Gators Reptile Park — Just five miles south, this roadside sanctuary utilizes the exact same geothermal water table to keep hundreds of rescued alligators warm in the valley.
- Great Sand Dunes National Park Night Sky Programs — Drive 25 minutes east after your soak to watch the night sky settle over massive dark dunes in a designated Dark Sky Park.
Good to know
How hot are the soaking pools inside the Greenhouse?
There are four distinct pools, stepped incrementally at 98, 102, 106, and 111 degrees Fahrenheit.
Can children enter the Greenhouse area?
No. The main outdoor pool complex out front is family-friendly, but the Greenhouse is strictly restricted to adults aged 21 and over with valid photo ID.
Is food and alcohol available inside?
Yes, the Greenhouse houses the Steel Box, an onsite bar serving wine and small food plates directly to guests inside the enclosure.
Do I need to book in advance?
Greenhouse access operates primarily on a walk-in basis as an add-on to general entry, but you should always confirm their weekly cleaning day before driving out.
Plan a visit & invite your people →
Further reading: Official site · cohotspringsloop.com · colorado.com
last checked: 2026-06-11