Concord Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.38

Bortle class

Class 8 (Class 8)

Darkness Quotient

26%

Dataset

April 2026

City sky

Concord: The Practical Verdict

Concord is a small city in California with substantial light pollution that renders its skies poorly suited for astronomy. The urban brightness significantly hampers visibility of celestial objects, making it impossible to see the Milky Way.

For observations, targets are limited to the brightest objects like the Moon, planets, and occasional double stars. Any attempt at visual deep-sky observation will encounter significant difficulties due to the city's light interference. Imaging distant nebulae may be possible with careful narrowband techniques designed for urban conditions but remains a challenge.

The nearest substantial improvement is Sonoma County, located approximately 140 km to the north-west. Its darker conditions justify the drive for any serious observer aiming to escape Concord's light influence, particularly for deep-sky targets or clearer Milky Way views.

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

Sonoma County, California sits about 140 km north west and reaches Bortle 4, roughly 13x darker.

Good dark window

Concord'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 Concord?

No. Concord is a Bortle Class 8 sky with SQM 18.38, 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 Concord?

Concord is Bortle Class 8 (SQM 18.38), a poor city sky for astronomy.

Is Concord good for stargazing?

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

Is Concord good for astrophotography?

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

What can you observe from Concord?

Primary targets from Concord 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 Concord?

The closest meaningfully darker mapped site is Richmond, California, about 28 km west south west of Concord, reaching Bortle 7.

When is the sky darkest in Concord?

The sky over Concord is darkest around January, December.

Is light pollution in Concord getting better or worse?

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

• Flannery Road, California

  Direction

  NE

  Distance (km)

  33.4

  SQM

  19.74

  Bortle

  6

• Richmond, California

  Direction

  WSW

  Distance (km)

  28.3

  SQM

  19.57

  Bortle

  7

• Marin County, California

  Direction

  WNW

  Distance (km)

  60.6

  SQM

  20.16

  Bortle

  6

• Sonoma County, California

  Direction

  NW

  Distance (km)

  140.2

  SQM

  21.16

  Bortle

  4

• Old Page Mill Trail, California

  Direction

  S

  Distance (km)

  75.6

  SQM

  19.76

  Bortle

  6