Roseville Stargazing & Astronomy Report

Light pollution and stargazing locations near Roseville

City
Roseville
Country
United States
Latitude
38.7521
Longitude
-121.2880

Key Sky Quality Metrics

SQM (mag/arcsec²)
18.25
Bortle class
Class 8 (Class 8)
Darkness Quotient
25%
Dataset
March 2026

City sky

Stargazing in Roseville

Roseville is a fast-growing suburban city in northern California, part of the greater Sacramento area and known for its broad spread of residential districts, retail development and commuter character.

The city generally experiences High Light Pollution, with a Darkness Quotient of 25% — making it brighter than many smaller inland towns, though not quite as overwhelmed as the largest urban cores.

For practical observing from within the city, the most realistic targets are the Moon, planets, double stars and the brightest open clusters. A few showpiece objects such as Orion Nebula and the brightest globular clusters can still be attempted, but faint galaxies, dim nebulae and the Milky Way are largely washed out by the urban glow.

Meaningfully darker skies are not close at hand, and a proper improvement takes a fairly substantial drive. The nearest reasonable step up is about 85 kilometres to the north-north-west, near Near Butte County, California, where conditions reach Bortle 4.

The map shows Roseville embedded in a broad, intense pool of urban light, with the brightest colours concentrated across the built-up core and blending into the larger metropolitan glow nearby. Rather than an isolated bright patch, the city sits within a connected band of illumination, so the sky brightness spreads well beyond the immediate centre.

The strongest darkening appears away from the main urban mass, especially towards the north, north-east and east, where the colours transition from yellow and green into blue, grey and eventually near-black. By contrast, the south and south-west remain tied to a much larger luminous zone, suggesting that those horizons stay heavily affected by distant city glow even after leaving Roseville itself.

There are also smaller bright islands scattered across the wider map, showing that outlying settlements interrupt the darker countryside in several directions. Even so, the overall pattern makes it clear that the cleaner escape routes are generally away from the densest urban corridor, with the most promising darker regions lying inland and to the north-eastern half of the compass.

How the sky looks overhead

Looking straight up from Roseville, the sky remains strongly affected by urban lighting. With an overhead reading of 18.25 SQM, the zenith sits in a bright city-sky regime where the background never becomes truly dark.

That usually means the familiar brighter constellations are still easy enough to trace, but the sky lacks richness and depth. Many of the fainter stars that normally fill in patterns are missing, and the Milky Way is generally lost from view.

For casual observing this is still enough for the Moon, planets and a handful of standout objects. For deep-sky work, though, the overhead brightness quickly becomes the main limiting factor.

north - poor

At around 15 kilometres north of Roseville, the sky is still poor, sitting around Bortle 7, so bright urban glow remains obvious. The encouraging part is that this direction improves quite steadily, with genuinely dark skies reached at about 100 kilometres and good conditions already appearing much sooner.

north-north-east - marginal

Towards the north-north-east, the sky at around 15 kilometres is marginal at Bortle 6, giving a noticeable improvement over the city but still leaving the background bright. This direction becomes much stronger farther out, with genuinely dark skies arriving at about 100 kilometres.

north-east - marginal

North-east is marginal at around 15 kilometres, with Bortle 6 conditions that are usable for brighter targets but not yet properly dark. It is one of the more promising escape routes, though, with genuinely dark skies reached at about 50 kilometres.

east-north-east - marginal

At roughly 15 kilometres east-north-east, the sky is marginal at Bortle 6, so the city glow is reduced but still quite present. Conditions improve well in this direction, with genuinely dark skies available at about 50 kilometres.

east - marginal

Looking east, a short drive brings the sky to marginal territory at around Bortle 6. Keep going and this direction becomes a good option, with Bortle 4 conditions by about 50 kilometres and genuinely dark skies at roughly 100 kilometres.

east-south-east - poor

East-south-east remains poor at around 15 kilometres, with Bortle 7 skies still dominated by light pollution. Farther out the improvement is much more convincing, with good dark-sky conditions by about 50 kilometres and genuinely dark skies around 100 kilometres away.

south-east - poor

South-east is still poor at around 15 kilometres, effectively little better than the city for serious deep-sky observing. It does improve with distance, reaching good conditions farther out and genuinely dark skies at about 100 kilometres.

south-south-east - poor

Towards the south-south-east, the sky at around 15 kilometres remains poor at Bortle 8, with heavy glow still present. This direction does improve to Bortle 4 farther out, but genuinely dark skies are not reached within the sampled distance.

south - poor

South of Roseville, the sky is still poor at around 15 kilometres, staying in Bortle 8 territory with strong urban interference. Improvement is patchy in this direction, and while better skies do appear farther away, genuinely dark skies are not reached within the sampled distance.

south-south-west - poor

South-south-west is poor at around 15 kilometres, with the sky still heavily washed out by surrounding light. There is some eventual improvement farther out, but genuinely dark skies are not reached within the sampled distance in this direction.

south-west - poor

South-west remains poor at around 15 kilometres, and this is one of the least rewarding nearby directions for a quick session. It eventually improves substantially, but genuinely dark skies do not arrive until about 200 kilometres from the city.

west-south-west - poor

At around 15 kilometres west-south-west, the sky is still poor at Bortle 7, with strong light pollution lingering across the horizon. This direction only really pays off with a long drive, as genuinely dark skies are not reached until about 200 kilometres out.

west - marginal

West of Roseville, the sky is marginal at around 15 kilometres, roughly Bortle 6, so there is some relief from the city but not a dramatic one. Darker conditions build more gradually here, with genuinely dark skies reached at about 100 kilometres.

west-north-west - marginal

West-north-west is marginal at around 15 kilometres with Bortle 6 conditions, giving a modest but noticeable improvement over central Roseville. Continue farther and this becomes a solid direction, with good skies by about 50 kilometres and genuinely dark skies around 100 kilometres away.

north-west - marginal

North-west is marginal at around 15 kilometres, where the sky improves to Bortle 6 but still shows clear urban glow. Farther out it becomes much more attractive, with genuinely dark skies reached at about 100 kilometres.

north-north-west - marginal

North-north-west is marginal at around 15 kilometres, with Bortle 6 conditions that are improved but still far from dark. It does become better with distance, reaching Bortle 4 farther out, though genuinely dark skies are not reached within the sampled distance.

zenith - poor

Straight overhead, Roseville's sky is poor, with a zenith brightness corresponding to Bortle 8. The brighter constellations remain visible, but the sky background is washed out, many fainter stars vanish, and the Milky Way is generally not visible from within the city.

  • Near Modoc County, California
    Direction
    SE
    Distance (km)
    275
    SQM
    21.45
    Bortle
    3

    Milky Way visible, broadband DSO imaging

  • Near Lake County, California
    Direction
    W
    Distance (km)
    119.7
    SQM
    21.18
    Bortle
    4

    Bright nebulae, galaxies, narrowband imaging

  • Near Butte County, California
    Direction
    NNW
    Distance (km)
    86
    SQM
    21.04
    Bortle
    4

    Bright nebulae, galaxies, narrowband imaging

Genuinely dark skies require a meaningful journey from Roseville rather than a quick hop out of town.

The nearest reasonable dark-sky improvement is about 85 kilometres to the north-north-west, near Near Butte County, California, where conditions reach Bortle 4. If you are willing to go farther, darker Bortle 3 skies become available at about 275 kilometres to the south-east, near Near Modoc County, California.

Closer to the city, there is some improvement in several directions, but much of the immediate surroundings still remain noticeably affected by metropolitan skyglow.

  • Within 100 km
    Place
    Near Butte County, California
    Direction
    NNW
    Distance (km)
    86
    SQM
    21.04
    Bortle
    4
  • Within 200 km
    Place
    Near Lake County, California
    Direction
    W
    Distance (km)
    119.7
    SQM
    21.18
    Bortle
    4
  • Within 500 km
    Place
    Near Modoc County, California
    Direction
    SE
    Distance (km)
    275
    SQM
    21.45
    Bortle
    3

Long-term light pollution trend

Roseville's long-term trend is fairly steady, but it points in the wrong direction for stargazers. The average reading across the record is 18.38 SQM, while the latest figure is 18.25 SQM, which is also the dimmest result in the series.

Since 2012, the change has been modest rather than dramatic, slipping from 18.48 SQM to 18.25 SQM across 76 datasets. That suggests a slow brightening of the night sky over time, consistent with gradual urban growth rather than a sudden shift.

In practical terms, observers in Roseville are dealing with a sky that has become a little more washed out over the years. The difference is not huge night-to-night, but over the long run it makes faint targets progressively harder to pick out from the city.

From within Roseville, urban light pollution strongly favours bright, high-contrast targets. The Moon and planets are the obvious winners, while double stars and the brightest open clusters also hold up reasonably well.

A small number of showcase deep-sky objects can still be tried with patience, especially visually prominent objects such as Orion Nebula and the brightest globular clusters. Even then, contrast is limited and the view is much less impressive than it would be from darker surroundings.

For anything subtle — the Milky Way, faint galaxies, diffuse nebulae or meteor watching — a darker site makes a dramatic difference. Those are the targets that really reward getting well away from the city glow.

  • Moon
  • planets
  • double stars
  • brightest open clusters
  • Orion Nebula (M42)
  • brightest globular clusters
  • Milky Way
  • faint galaxies
  • broadband nebulae
  • meteor showers

Can you see stars from Roseville?

Yes — you can still see plenty of the brighter stars and main constellation patterns from Roseville. What you lose is the finer detail: many faint stars are washed out by the city-bright sky.

Can you see the Milky Way from Roseville?

In most cases, no. With Roseville's bright city sky, the Milky Way is generally overwhelmed by background glow and is far better sought from a darker site outside the city.

What Bortle class is Roseville?

Roseville is Bortle 8, which corresponds to a bright city sky. In practical terms, that means the sky is strongly light-polluted and deep-sky observing is quite limited from within the city.

What is the SQM reading for Roseville?

Roseville has an SQM reading of 18.25. That indicates a fairly bright night sky by astronomical standards, with noticeably reduced contrast for faint objects.

Where are the nearest dark skies to Roseville?

The nearest reasonable dark-sky improvement in the supplied locations is near Near Butte County, California, about 86 kilometres to the north-north-west, where conditions reach Bortle 4. A darker Bortle 3 option is near Near Modoc County, California, about 275 kilometres to the south-east.

Is Roseville good for astrophotography?

It can work for lunar, planetary and some narrow-field imaging of bright targets, especially if you manage local stray light carefully. For wide-field nightscapes, faint nebulae and richer deep-sky imaging, a darker location will give far better results.

How far do you need to drive from Roseville for darker skies?

For a worthwhile improvement, you are generally looking at about 85 kilometres to reach Bortle 4 conditions near Near Butte County, California. If you want a clearer step into genuinely dark sky, the best listed option is much farther away, around 275 kilometres to Near Modoc County, California.