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The Milky Way over the geodesic dome at Kosmos, photographed on site by Mark Cunningham
Stargazing tours

The darkest skies in Colorado, guided

An evening with our resident astronomers under Bortle Class 2 skies, 18 minutes from the Great Sand Dunes National Park entrance.

Check availabilityPrivate at your villa ↓
Astronomer-led
Small groups
$129 adult · $99 child
Full refund if clouds cancel
Why here

Some of the darkest sky left in America

The San Luis Valley is high, dry and almost entirely unlit. Kosmos became Colorado's first DarkSky Approved Lodging property because the sky above it genuinely qualifies, not because we pointed a telescope at it.

2
Bortle class
7,600
Feet elevation
1st
DarkSky Approved Lodging in Colorado
18
Minutes to the Dunes entrance
The evening

What actually happens

01
Arrive at dusk

Red headlamps out, phones down. Your eyes take about twenty minutes to adapt, and most people have never let that happen.

02
Read the sky by eye

Before any glass, your astronomer walks you across what is actually overhead tonight, and shows you how to find it again from home.

03
Look through the glass

Celestron Origin and 10-inch Dobsonian telescopes, working whatever the season offers. Recline with binoculars between objects.

04
Take the night home

A printed photograph, something hot to drink in the dome, and questions answered for as long as you have them.

The sky changes nightly. What you see depends on the season and the moon, and your astronomer will tell you what is up before you arrive.

The stargazing tour

One evening, everything included

$129
Per adult · $99 per child
Astronomer-led session under Bortle Class 2 skies
Celestron Origin and 10-inch Dobsonian telescopes
Zero-gravity chairs and Celestron binoculars
Heated dome with snacks and drinks
Red headlamp to protect your night vision
A printed photograph to take home
Kosmos Stargazer membership, one year
Constellation tour by eye before the telescopes

Booking here gets you the same price and the better cancellation terms. Tours run every clear night; we watch the forecast daily and tell you well before you drive out.

Ways to visit

Three ways to stand under it

Most booked
The Stargazing Tour
$129 per adult · $99 per child

The standard evening, led by one of our astronomers, on site under the open sky. Add-ons available when you book.

Check availability
For villa guests
Private Villa Stargazing
$495 per session · everyone in your villa

Your own astronomer and telescopes, set up at your villa. Everyone staying is included. No driving out to a field, and your hot tub is a few steps away.

Reserve a session
Free
Community Nights
No charge

Open to San Luis Valley residents and Kosmos VIP Members. The valley welcomed us and gave us our start; these nights are its turn to use the place.

See upcoming
Your guides

The night is in good hands

Every tour is led by one of two people. Neither reads from a script, and both will keep answering questions long after the hour is up.

Nerissa Valdez, Director of Astronomy at Kosmos Stargazing Resort
Nerissa Valdez
Director of Astronomy

Nerissa runs the sky program at Kosmos and lives twenty-five minutes away in Alamosa, where she is finishing her PhD. She has spent years putting people behind telescopes for the first time, and she is very good at the part where you have no idea what you are looking at yet.

Mark Cunningham, NASA/JPL Solar System Ambassador, who leads night-sky tours at Kosmos
Mark Cunningham
Night-Sky Tours · NASA/JPL Solar System Ambassador

Mark is a self-taught astronomer with twenty-five years behind a camera, and a NASA/JPL Solar System Ambassador. He has guided thousands of people through the night sky for astronomy clubs, schools and land trusts across Colorado. Every astrophotograph on this page is his.

What you'll see

Taken from Kosmos

Photographed on site by Mark Cunningham
The M51 Whirlpool Galaxy photographed from Kosmos by Mark Cunningham
M51 Whirlpool Galaxy
The M13 Hercules Cluster photographed from Kosmos by Mark Cunningham
M13 Hercules Cluster
The M20 Trifid Nebula photographed from Kosmos by Mark Cunningham
M20 Trifid Nebula
The NGC 7000 North America Nebula photographed from Kosmos by Mark Cunningham
NGC 7000 North America Nebula
The M8 Lagoon Nebula photographed from Kosmos by Mark Cunningham
M8 Lagoon Nebula
The M101 Pinwheel Galaxy photographed from Kosmos by Mark Cunningham
M101 Pinwheel Galaxy
A meteor seen through the dome window at Kosmos, photographed by Mark Cunningham
Meteor through the dome window
The moon above the geodesic dome at Kosmos, photographed by Mark Cunningham
Moon over the dome

Every image here was captured on the ground you will be standing on, with the equipment that will be set up when you arrive. None of it is stock, and none of it is NASA.

Our promise

If the sky doesn't cooperate

We watch the forecast every day. If cloud cancels your tour, we move you to another night or refund you in full.

You will hear from us well before you set out, not when you arrive. Nobody drives to the valley to stand under an overcast sky.

The moon

The darker the moon, the more you see. The nights around a new moon are the best of any month, and they book first.

Summer

The Milky Way core is overhead and the nights are mild. Tours start late, once the sky is genuinely dark.

Winter

Colder, but the steadiest air of the year and the earliest starts. Dress for standing still at 7,600 feet.

Guest stories

What guests remember

It was great fun to get to see so many different telescopes under such a beautiful dark sky.

Mitchell Lubbers · April 2025

The CEO was there, the architect, the director of Astronomy, a NASA astrophysicist from Goddard, local recreational astronomers. This place is world class.

Elliot LeNormand
Reserve your evening
Before you book

Know before you go

What should I wear?

Layers, and more than you think. You are standing still at 7,600 feet after dark, and the valley drops temperature fast once the sun is gone. Bring a warm hat even in summer.

Do I need to know anything about astronomy?

No. Most guests have never looked through a telescope. Your astronomer starts with the sky by eye and works up from there.

Can I bring my own camera?

Yes. Mark Cunningham has 25 years behind a camera and is happy to help you set up. A tripod and a lens that opens wide will get you further than an expensive body.

Do I have to be staying at Kosmos?

Not for the standard tour, which is open to anyone. Private Villa Stargazing is for guests staying with us, because it happens at your villa.

What will we actually see?

It depends on the season and the moon. Planets, star clusters, nebulae and galaxies are all in reach on a dark night. We will tell you what is up before you come, and we do not promise specific objects.

How far is it from the Great Sand Dunes?

18 minutes to the National Park entrance, 16.2 miles. Alamosa is 25 minutes away, and so is the regional airport.

A red meteor over the Kosmos dome, photographed on site by Mark Cunningham

The sky is out tonight either way

$129 per adult, $99 per child. Full refund if cloud cancels your evening.

Check availability