St. Catharines Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.25

Bortle class

Class 8 (Class 8)

Darkness Quotient

25%

Dataset

May 2026

City sky

St. Catharines: The Practical Verdict

St. Catharines, a small city in Ontario, experiences high light pollution, which significantly hampers stargazing efforts. The urban glow makes it a poor location for astronomy, where most deep-sky viewing is severely restricted.

Within the city skies, you are limited to observing the Moon, planets, bright stars, and some double stars. Some solar system events and bright open clusters can be appreciated, though only with narrowband imaging can deeper analysis be conducted. The Milky Way is entirely invisible, swallowed by the city's light.

For those seeking better skies, Limestone Township in Pennsylvania, approximately 165 km to the south, offers a meaningful upgrade with significantly darker skies for deep-sky observation.

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

Limestone Township, Pennsylvania sits about 166 km south and reaches Bortle 4, roughly 14x darker.

Good dark window

St. Catharines'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 St. Catharines?

No. St. Catharines is a Bortle Class 8 sky with SQM 18.25, 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 St. Catharines?

St. Catharines is Bortle Class 8 (SQM 18.25), a poor city sky for astronomy.

Is St. Catharines good for stargazing?

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

Is St. Catharines good for astrophotography?

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

What can you observe from St. Catharines?

Primary targets from St. Catharines 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 St. Catharines?

The closest meaningfully darker mapped site is Golden Horseshoe, Ontario, about 26 km north west of St. Catharines, reaching Bortle 6.

When is the sky darkest in St. Catharines?

The sky over St. Catharines is darkest around January, December.

Is light pollution in St. Catharines getting better or worse?

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

• Golden Horseshoe, Ontario

  Direction

  NW

  Distance (km)

  26

  SQM

  19.91

  Bortle

  6

• Port Colborne, Ontario

  Direction

  SSE

  Distance (km)

  26.4

  SQM

  19.73

  Bortle

  6

• Town of Oakfield, New York

  Direction

  E

  Distance (km)

  77.8

  SQM

  20.32

  Bortle

  5

• Hannon Heights, Pennsylvania

  Direction

  SSW

  Distance (km)

  128.9

  SQM

  20.67

  Bortle

  5

• Limestone Township, Pennsylvania

  Direction

  S

  Distance (km)

  165.8

  SQM

  21.15

  Bortle

  4