Santa Rosa Stargazing & Astronomy Report

Light pollution and stargazing locations near Santa Rosa

City
Santa Rosa
Country
United States
Latitude
38.4404
Longitude
-122.7141

Key Sky Quality Metrics

SQM (mag/arcsec²)
18.72
Bortle class
Class 8 (Class 8)
Darkness Quotient
30%
Dataset
May 2026

City sky

Santa Rosa: The Practical Verdict

Santa Rosa, a small city located in California, finds itself under a canopy of high light pollution. This results in a poor city sky overall, substantially limiting the quality of astronomical observation. The predominant challenge is the urban sky brightness that virtually erases the Milky Way from view.

Within this light-drenched environment, the best stargazing opportunities include the Moon, planets, bright stars, and double stars, alongside solar system events. Narrowband imaging is possible if undertaken with caution, but deep-sky observations are largely futile. The brighter targets stand out, but more expansive or faint objects suffer significantly under the intense glare of the city.

For enthusiasts seeking clearer skies, Walker Ridge Road, approximately 75 km to the south-east, offers a meaningful upgrade with a Bortle 4 sky. This site presents an excellent alternative for deeper astronomical pursuits compared to what Santa Rosa offers.

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
Walker Ridge Road, California sits about 76 km south east and reaches Bortle 4, roughly 8.6x darker.
Good dark window
Santa Rosa'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 Santa Rosa?

No. Santa Rosa is a Bortle Class 8 sky with SQM 18.72, 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 Santa Rosa?

Santa Rosa is Bortle Class 8 (SQM 18.72), a poor city sky for astronomy.

Is Santa Rosa good for stargazing?

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

Is Santa Rosa good for astrophotography?

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

What can you observe from Santa Rosa?

Primary targets from Santa Rosa 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 Santa Rosa?

The closest meaningfully darker mapped site is Bodega, California, about 21 km west south west of Santa Rosa, reaching Bortle 5.

When is the sky darkest in Santa Rosa?

The sky over Santa Rosa is darkest around January, December.

Is light pollution in Santa Rosa getting better or worse?

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

north - good

Clean horizon to the north. Star counts remain high near the ground.

north-north-east - good

The north-north-east horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.

north-east - good

Clean horizon to the north-east. Star counts remain high near the ground.

east-north-east - good

Clean, dark sky to the east-north-east. No visible artificial light source affects this quarter.

east - good

Clean horizon to the east. Star counts remain high near the ground.

east-south-east - good

No visible glow on the east-south-east horizon. Stars are clear down to low elevation in this direction.

south-east - good

Clean, dark sky to the south-east. No visible artificial light source affects this quarter.

south-south-east - good

Clean horizon to the south-south-east. Star counts remain high near the ground.

south - good

The south horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.

south-south-west - good

The south-south-west horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.

south-west - good

No visible glow on the south-west horizon. Stars are clear down to low elevation in this direction.

west-south-west - good

The west-south-west sky shows no obvious glow at ground level. Faint stars are clear at low elevation.

west - good

The west horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.

west-north-west - good

No visible glow on the west-north-west horizon. Stars are clear down to low elevation in this direction.

north-west - good

The north-west horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.

north-north-west - good

The north-north-west sky shows no obvious glow at ground level. Faint stars are clear at low elevation.

zenith - marginal

Light pollution affects most of the overhead sky. Star counts are a fraction of a dark site.

  • Bodega, California
    Direction
    WSW
    Distance (km)
    21.4
    SQM
    20.60
    Bortle
    5
  • Marshall, California
    Direction
    SSW
    Distance (km)
    33.4
    SQM
    20.75
    Bortle
    5
  • Sewell Road, California
    Direction
    WNW
    Distance (km)
    44
    SQM
    20.72
    Bortle
    5
  • Napa County, California
    Direction
    ENE
    Distance (km)
    49.6
    SQM
    20.49
    Bortle
    5
  • 2153, California
    Direction
    ESE
    Distance (km)
    42.2
    SQM
    20.20
    Bortle
    6
  • Walker Ridge Road, California
    Direction
    SE
    Distance (km)
    75.6
    SQM
    21.05
    Bortle
    4