Oshawa Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.03

Bortle class

Class 8 (Class 8)

Darkness Quotient

23%

Dataset

April 2026

City sky

Oshawa: The Practical Verdict

Oshawa, a small city in Ontario, offers observing conditions typical of urban settings with high light pollution. The city sky is rated as poor for astronomy, heavily impacted by nearby Toronto's intense brightness to the west-south-west.

Stargazing within Oshawa is largely limited to bright targets. The Milky Way is completely lost to urban glare, but planets, the Moon, and bright stars remain easily visible. Narrowband imaging can produce some results, particularly for brighter nebulae, but conditions are far from ideal for deep-sky observing.

For those seeking darker skies, a significant improvement can be found in Stone Mills, Ontario, about 155 kilometres east-north-east. This area notably offers Bortle 4 skies suitable for much more fruitful deep-sky exploration.

At a Glance

Overall

Poor city sky - This is a poor city sky. The Milky Way is not visible and most deep-sky observing is unrealistic from the location itself.

Milky Way

Not visible - The Milky Way is erased by the bright urban sky background.

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

Stone Mills, Ontario sits about 156 km east north east and reaches Bortle 4, roughly 14x darker.

Good dark window

Oshawa'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 Oshawa?

No. Oshawa is a Bortle Class 8 sky with SQM 18.03, 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 Oshawa?

Oshawa is Bortle Class 8 (SQM 18.03), a poor city sky for astronomy.

Is Oshawa good for stargazing?

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

Is Oshawa good for astrophotography?

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

What can you observe from Oshawa?

Primary targets from Oshawa 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 Oshawa?

The closest meaningfully darker mapped site is Kawartha Lakes, Ontario, about 37 km east of Oshawa, reaching Bortle 6.

When is the sky darkest in Oshawa?

The sky over Oshawa is darkest around January, December.

Is light pollution in Oshawa getting better or worse?

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

• Kawartha Lakes, Ontario

  Direction

  E

  Distance (km)

  36.6

  SQM

  20.19

  Bortle

  6

• Orleans County, New York

  Direction

  SSE

  Distance (km)

  61.4

  SQM

  20.78

  Bortle

  5

• Niagara County, New York

  Direction

  S

  Distance (km)

  47.8

  SQM

  20.02

  Bortle

  6

• Monroe County, New York

  Direction

  ESE

  Distance (km)

  96.2

  SQM

  20.56

  Bortle

  5

• Stone Mills, Ontario

  Direction

  ENE

  Distance (km)

  155.6

  SQM

  20.91

  Bortle

  4