St. Paul Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.74

Bortle class

Class 9 (Class 9)

Darkness Quotient

21%

Dataset

May 2026

Inner city sky

St. Paul: The Practical Verdict

St. Paul, situated in Minnesota, typifies a mid-size city environment strongly impacted by high light pollution, exacerbated by its proximity to Minneapolis to the west. This results in a severe urban sky where only the brightest celestial objects such as the Moon, planets, and bright stars are easily observable. To enjoy a wider range of astronomical experiences, it is advisable to travel outside the city.

From within the city, the Milky Way is completely obscured. Observing is effectively limited to bright targets like double stars and solar system events. Narrowband imaging can be attempted with care, but the strong light pollution washes out faint nebulae, broadband galaxies, and widefield Milky Way views entirely.

For a significantly better stargazing experience, Otranto Township, Iowa, lies approximately 170 km to the south. It offers substantially darker skies under Bortle 4 conditions, making it a worthwhile destination for enthusiasts seeking deeper cosmic views.

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

Otranto Township, Iowa sits about 170 km south and reaches Bortle 4, roughly 21x darker.

Good dark window

St. Paul'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. Paul?

No. St. Paul is a Bortle Class 9 sky with SQM 17.74, 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. Paul?

St. Paul is Bortle Class 9 (SQM 17.74), a severe urban sky for astronomy.

Is St. Paul good for stargazing?

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

Is St. Paul good for astrophotography?

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

What can you observe from St. Paul?

Primary targets from St. Paul 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. Paul?

The closest meaningfully darker mapped site is New Prague, Minnesota, about 58 km south west of St. Paul, reaching Bortle 6.

When is the sky darkest in St. Paul?

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

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

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

• Spring Lake, Minnesota

  Direction

  SE

  Distance (km)

  64.3

  SQM

  20.37

  Bortle

  5

• New Prague, Minnesota

  Direction

  SW

  Distance (km)

  58.2

  SQM

  19.73

  Bortle

  6

• Otranto Township, Iowa

  Direction

  S

  Distance (km)

  170

  SQM

  21.04

  Bortle

  4

• North Branch, Wisconsin

  Direction

  ESE

  Distance (km)

  176.5

  SQM

  21.03

  Bortle

  4

• Caledonia Township, Minnesota

  Direction

  SE

  Distance (km)

  191.6

  SQM

  20.68

  Bortle

  5