Modesto Stargazing & Astronomy Report
Light pollution and stargazing locations near Modesto
- City
- Modesto
- Country
- United States
- Latitude
- 37.6391
- Longitude
- -120.9969
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 18.07
- Bortle class
- Class 8 (Class 8)
- Darkness Quotient
- 24%
- Dataset
- April 2026
City sky
Modesto: The Practical Verdict
Modesto, a small city in California, presents challenges for stargazing due to high levels of light pollution. The overall sky quality is poor, with the Milky Way completely obscured and limiting opportunities for observing fainter celestial objects.
Observers here are best focusing on the Moon, planets, bright stars, and double stars, as these remain accessible despite the glow. Narrowband imaging is possible, though gradient noise from the sky background compromises accuracy. Truly rewarding deep-sky observations will be hard to achieve.
For much clearer skies, Monterey County to the south offers a substantial upgrade. Around a two-hour drive, it provides darker conditions and is suitable for serious astronomy efforts.
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
- Monterey County, California sits about 177 km south and reaches Bortle 4, roughly 17x darker.
- Good dark window
- Modesto'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 Modesto?
No. Modesto is a Bortle Class 8 sky with SQM 18.07, 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 Modesto?
Modesto is Bortle Class 8 (SQM 18.07), a poor city sky for astronomy.
Is Modesto good for stargazing?
Not for serious deep-sky observing. Modesto is a poor city sky where the Moon, planets, and a handful of bright targets are the realistic options from the city itself.
Is Modesto good for astrophotography?
Broadband deep-sky imaging is heavily compromised from Modesto and a Bortle 4 or darker site is strongly recommended. Even narrowband imaging is difficult from Modesto without careful processing.
What can you observe from Modesto?
Primary targets from Modesto 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 Modesto?
The closest meaningfully darker mapped site is 15239, California, about 44 km west of Modesto, reaching Bortle 6.
When is the sky darkest in Modesto?
The sky over Modesto is darkest around January, December.
Is light pollution in Modesto getting better or worse?
Long-term light pollution over Modesto has been broadly stable across the available measurements.
north - fair
The north horizon is mostly dark with a hint of light pollution. Faint stars are accessible above about 10 degrees.
north-north-east - good
Clean, dark sky to the north-north-east. No visible artificial light source affects this quarter.
north-east - fair
The north-east horizon is mostly dark with a hint of light pollution. Faint stars are accessible above about 10 degrees.
east-north-east - good
Clean horizon to the east-north-east. Star counts remain high near the ground.
east - good
Clean, dark sky to the east. No visible artificial light source affects this quarter.
east-south-east - fair
Subtle skyglow on the east-south-east horizon. Faint stars below about 10 degrees here are slightly suppressed.
south-east - fair
Mild brightening on the south-east horizon. Faint stars at the very lowest elevation are dimmed; otherwise unaffected.
south-south-east - fair
The south-south-east horizon is mostly dark with a hint of light pollution. Faint stars are accessible above about 10 degrees.
south - good
Clean, dark sky to the south. No visible artificial light source affects this quarter.
south-south-west - good
Clean, dark sky to the south-south-west. No visible artificial light source affects this quarter.
south-west - good
The south-west horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.
west-south-west - good
No visible glow on the west-south-west horizon. Stars are clear down to low elevation in this direction.
west - good
No visible glow on the west horizon. Stars are clear down to low elevation in this direction.
west-north-west - good
The west-north-west horizon is free of artificial brightening. Faint stars are visible to within a few degrees of the ground.
north-west - fair
A small artificial brightening near the north-west horizon. Star counts in this direction remain high above the lowest elevations.
north-north-west - fair
The north-north-west horizon shows a slight brightening. Workable for most targets above about 10 degrees elevation.
zenith - marginal
Overhead is significantly light-polluted. Limiting magnitude is around 3.5 to the unaided eye.
-
15239, California
- Direction
- W
- Distance (km)
- 43.7
- SQM
- 19.94
- Bortle
- 6
-
1557, California
- Direction
- SW
- Distance (km)
- 66.9
- SQM
- 20.09
- Bortle
- 6
-
Mantelli Ranch, California
- Direction
- SSW
- Distance (km)
- 77.8
- SQM
- 20.19
- Bortle
- 6
-
West Eight Mile Road, California
- Direction
- NW
- Distance (km)
- 70.2
- SQM
- 19.87
- Bortle
- 6
-
Fresno County, California
- Direction
- SSE
- Distance (km)
- 112.6
- SQM
- 20.28
- Bortle
- 6
-
Monterey County, California
- Direction
- S
- Distance (km)
- 177.2
- SQM
- 21.12
- Bortle
- 4