Peoria Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.81

Bortle class

Class 9 (Class 9)

Darkness Quotient

21%

Dataset

April 2026

Inner city sky

Peoria: The Practical Verdict

Peoria, a mid-sized city in Illinois, presents a sky dominated by high light pollution, making it unsuitable for most astronomical observations. The overall conditions are categorised as a severe urban sky with a darkness quotient of 21, ensuring that the Milky Way is completely invisible.

Observers in Peoria will find that only the brightest celestial objects are visible across the city’s sky. While the Moon, planets, and the most prominent stars can punch through the glow, deep-sky targets like galaxies and faint nebulae remain unobservable. Narrowband imaging might yield results, but challenges with sky gradients persist. The western horizon is slightly clearer, in contrast to the brightly lit south-east.

To access considerably darker skies for deep-sky observation, a drive west to 1300 North Avenue is recommended. This location, around 70 km from the city, offers true Bortle 4 conditions, providing a stark improvement even for advanced imaging or faint visual targets.

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

1300 North Avenue, Illinois sits about 72 km west and reaches Bortle 4, roughly 17x darker.

Good dark window

Peoria'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 Peoria?

No. Peoria is a Bortle Class 9 sky with SQM 17.81, 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 Peoria?

Peoria is Bortle Class 9 (SQM 17.81), a severe urban sky for astronomy.

Is Peoria good for stargazing?

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

Is Peoria good for astrophotography?

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

What can you observe from Peoria?

Primary targets from Peoria 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 Peoria?

The closest meaningfully darker mapped site is 1300 North Avenue, Illinois, about 72 km west of Peoria, reaching Bortle 4.

When is the sky darkest in Peoria?

The sky over Peoria is darkest around January, December.

Is light pollution in Peoria getting better or worse?

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

• 1300 North Avenue, Illinois

  Direction

  W

  Distance (km)

  72.2

  SQM

  20.89

  Bortle

  4

• Mount Fulcher, Illinois

  Direction

  S

  Distance (km)

  78.6

  SQM

  20.35

  Bortle

  5

• LaSalle, Illinois

  Direction

  NNE

  Distance (km)

  87

  SQM

  20.27

  Bortle

  6

• Strawns Crossing, Illinois

  Direction

  SSW

  Distance (km)

  111.5

  SQM

  20.58

  Bortle

  5

• Willow Road, Illinois

  Direction

  SSE

  Distance (km)

  154.8

  SQM

  20.80

  Bortle

  4

• North 2150 East Road, Illinois

  Direction

  E

  Distance (km)

  158.2

  SQM

  20.80

  Bortle

  4