Calgary Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.52

Bortle class

Class 9 (Class 9)

Darkness Quotient

19%

Dataset

April 2026

Inner city sky

Calgary: The Practical Verdict

Calgary, as a major city in Alberta, is deeply affected by extreme light pollution. The sky here is classified as a severe urban environment, with a Bortle 9 level of brightness. This makes it unsuitable for most deep-sky observing, with the Milky Way entirely obscured.

From within Calgary, stargazers are limited to observing the brightest celestial objects. Targets such as the Moon, planets, and brightest double stars are manageable, and narrowband imaging of nebulae is possible with care. However, nearly all broadband and faint object observing is out of reach due to the pervasive skyglow.

For those seeking darker skies, Clearwater County to the north-north-west is a recommended destination, offering much improved conditions at Bortle 3 quality. This site significantly reduces urban light interference, making it worth considering for deeper astronomical pursuits.

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

Clearwater County, Alberta sits about 180 km north north west and reaches Bortle 3, roughly 36x darker.

Moderate dark window

Calgary'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 Calgary?

No. Calgary is a Bortle Class 9 sky with SQM 17.52, 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 Calgary?

Calgary is Bortle Class 9 (SQM 17.52), a severe urban sky for astronomy.

Is Calgary good for stargazing?

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

Is Calgary good for astrophotography?

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

What can you observe from Calgary?

Primary targets from Calgary 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 Calgary?

The closest meaningfully darker mapped site is Clearwater County, Alberta, about 180 km north north west of Calgary, reaching Bortle 3.

When is the sky darkest in Calgary?

The sky over Calgary is darkest around January, December. Significant summer limitation: around 54 nights per year have no true astronomical darkness.

Is light pollution in Calgary getting better or worse?

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

• Clearwater County, Alberta

  Direction

  NNW

  Distance (km)

  179.6

  SQM

  21.42

  Bortle

  3

• Area B (Shelter Bay/Mica Creek), British Columbia

  Direction

  W

  Distance (km)

  275.1

  SQM

  21.64

  Bortle

  3

• Fort Piegan, Montana

  Direction

  SSE

  Distance (km)

  287.2

  SQM

  21.61

  Bortle

  3