Madison Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.48

Bortle class

Class 8 (Class 8)

Darkness Quotient

27%

Dataset

August 2026

City sky

Madison: The Practical Verdict

Madison, Wisconsin, a mid-size city with a suburban setting, is under a blanket of high light pollution affecting astronomical observations. The city sky is rated as poor, with Bortle Class 8 conditions, severely limiting deep-sky visibility. The brightness of the urban sky obstructs the view of the Milky Way entirely.

In these conditions, the most practical targets are the Moon, planets, and bright stars, which can reliably pierce through the urban glow. Narrowband imaging is only viable with caution, and traditional visual deep-sky observing is largely futile. Bright nebulae in narrowband and bright open clusters offer limited success but should be pursued with care.

For those seeking slight improvements in sky quality, a trip to the Town of Waldwick, about 55 km west-south-west, offers marginally darker skies still, within Bortle Class 5 conditions. While not dramatically darker, it provides a modest upgrade for more serious enthusiasts.

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

Limited nearby upgrade

Town of Waldwick, Wisconsin is the strongest nearby option but remains Bortle 5; the improvement is real but modest.

Good dark window

Madison'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 Madison?

No. Madison is a Bortle Class 8 sky with SQM 18.48, 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 Madison?

Madison is Bortle Class 8 (SQM 18.48), a poor city sky for astronomy.

Is Madison good for stargazing?

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

Is Madison good for astrophotography?

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

What can you observe from Madison?

Primary targets from Madison 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 Madison?

The closest meaningfully darker mapped site is Town of Arlington, Wisconsin, about 27 km west of Madison, reaching Bortle 5.

When is the sky darkest in Madison?

The sky over Madison is darkest around January, December.

Is light pollution in Madison getting better or worse?

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

• Town of Arlington, Wisconsin

  Direction

  W

  Distance (km)

  27.1

  SQM

  20.36

  Bortle

  5

• Town of Waldwick, Wisconsin

  Direction

  WSW

  Distance (km)

  52.6

  SQM

  20.68

  Bortle

  5

• Town of Troy, Wisconsin

  Direction

  ESE

  Distance (km)

  82

  SQM

  20.25

  Bortle

  6