Denver Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.82

Bortle class

Class 9 (Class 9)

Darkness Quotient

21%

Dataset

August 2026

Inner city sky

Denver: The Practical Verdict

Denver, a major city in Colorado, is characterised by severe urban sky conditions, limiting most deep sky observing pursuits. The Milky Way is not visible, and Bortle Class 9 conditions mean astronomical quality is very poor for those seeking a dark night sky. High light pollution is the primary limiting factor, with the eastward horizon particularly bright.

From Denver, the most accessible targets are bright solar system objects such as the Moon and planets. Double stars and bright star fields also fare reasonably well under these urban skies. Deep-sky observing is best avoided, as these light conditions severely limit the ability to see fainter objects like galaxies and nebulae. Narrowband imaging can be attempted with care, but is less than ideal here.

For those seeking significantly better conditions, Parachute, Colorado, to the west, offers a dramatic improvement in sky darkness, featuring Bortle Class 3 skies. It is a worthwhile trip for serious deep-sky enthusiasts.

At a Glance

Overall

Severe urban sky - This is a severely light-polluted urban sky. Only the Moon, planets, bright stars, and a few specialist targets remain practical.

Milky Way

Not visible - The Milky Way is not visible from this sky.

Best targets from here

Moon, planets, bright stars, double stars, solar system events, narrowband imaging only with care

Do not prioritise

visual deep-sky observing, broadband galaxies, reflection nebulae, widefield Milky Way

Best nearby upgrade

Parachute, Colorado sits about 261 km west and reaches Bortle 3, roughly 32x darker.

Good dark window

Denver's longest dark windows fall in December and January, with the shortest nights around June and July. Plan deep-sky sessions around the autumn and winter months for the best combination of long nights and true astronomical darkness.

Frequently Asked Questions

Can you see the Milky Way from Denver?

No. Denver is a Bortle Class 9 sky with SQM 17.82, so the Milky Way is not visible from the city. For Milky Way photography, look for a Bortle 4 or darker site.

What Bortle class is Denver?

Denver is Bortle Class 9 (SQM 17.82), a severe urban sky for astronomy.

Is Denver good for stargazing?

Not for serious deep-sky observing. Denver is a severe urban sky where the Moon, planets, and a handful of bright targets are the realistic options from the city itself.

Is Denver good for astrophotography?

Broadband deep-sky imaging is heavily compromised from Denver and a Bortle 4 or darker site is strongly recommended. Even narrowband imaging is difficult from Denver without careful processing.

What can you observe from Denver?

Primary targets from Denver include Moon, planets, bright stars, double stars, solar system events. Targets such as visual deep-sky observing, broadband galaxies, reflection nebulae are not realistic from this sky.

Where are darker skies near Denver?

The closest meaningfully darker mapped site is Weld County, Colorado, about 36 km north north east of Denver, reaching Bortle 6.

When is the sky darkest in Denver?

The sky over Denver is darkest around January, December.

Is light pollution in Denver getting better or worse?

Long-term light pollution over Denver has been broadly stable across the available measurements.

• Weld County, Colorado

  Direction

  NNE

  Distance (km)

  35.9

  SQM

  19.70

  Bortle

  6

• Parachute, Colorado

  Direction

  W

  Distance (km)

  261.1

  SQM

  21.58

  Bortle

  3

• County Road 57, Colorado

  Direction

  WNW

  Distance (km)

  274.5

  SQM

  21.57

  Bortle

  3