Fontana Stargazing & Astronomy Report
Light pollution and stargazing locations near Fontana
- City
- Fontana
- Country
- United States
- Latitude
- 34.0922
- Longitude
- -117.4350
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 17.85
- Bortle class
- Class 9 (Class 9)
- Darkness Quotient
- 22%
- Dataset
- March 2026
Inner city sky
Stargazing in Fontana
Fontana is a large inland city in Southern California, part of the heavily urbanised Inland Empire east of Los Angeles.
With a Darkness Quotient of 22%, Fontana sits in the High Light Pollution tier — making it brighter than good suburban observing areas, though not quite among the very worst city cores.
For practical observing from within the city, the most reliable targets are the Moon, planets, double stars and the brightest open clusters. A few showpiece deep-sky objects can be attempted with care, but faint galaxies, nebulae and the Milky Way are largely washed out by the skyglow.
Meaningfully darker skies are not close at hand, and a worthwhile improvement takes a fairly substantial drive. The nearest reasonable step up is about 80 kilometres to the north-north-east, near San Bernardino County, California, where conditions reach a much more useful level for general stargazing.
The map shows Fontana embedded in a broad, intense pool of urban light, with the city merging into a large pink-white core rather than standing apart as an isolated bright patch. That pattern is typical of a continuous metropolitan area, where separate towns and cities blend into one large skyglow dome.
Around the central bright zone, the colours fade outward through red, orange, yellow and green, showing a gradual reduction in brightness rather than a sharp edge. The darkest regions in the crop lie mainly toward the north-east and east, where the map opens into broad grey and dark-grey areas, while the west and south-west remain strongly affected by extended urban lighting.
Overall, Fontana appears brighter than much of its immediate surroundings, but it is also clearly part of a much larger regional glow. The most promising escape routes on the map are away from the continuous urban belt, especially toward the north-east side of the crop where the darker tones become more extensive.
How the sky overhead behaves
Looking straight up from Fontana, the sky is bright enough that the overhead view is shaped more by urban skyglow than by natural darkness. The brightest stars and familiar constellations remain visible, but the background sky never becomes truly black.
This kind of sky tends to flatten contrast across the whole dome, so the Moon and planets still stand out well, while fainter star fields look sparse and subdued. Even near the zenith, where conditions are usually best in any city, deep-sky detail is limited and the Milky Way is effectively lost.
For casual observing, that still leaves plenty to enjoy, especially during planetary events, lunar phases and bright conjunctions. For more ambitious deep-sky work, however, Fontana's overhead sky is restrictive enough that travelling out of the city makes a very noticeable difference.
north - marginal
About 15 kilometres north of Fontana, the sky improves to Bortle 6, which is marginal but noticeably better than the city centre. In this direction, genuinely dark skies are reachable farther out at around 100 kilometres, where conditions reach Bortle 3.
north-north-east - poor
About 15 kilometres north-north-east of the city, the sky is still Bortle 7, so this remains a poor direction for a quick observing run. It does improve with distance, and genuinely dark conditions appear much farther out at around 200 kilometres.
north-east - poor
At roughly 15 kilometres to the north-east, conditions are still Bortle 8, so the horizon remains strongly affected by urban glow. This direction gets much better with distance, reaching genuinely dark skies at around 100 kilometres.
east-north-east - poor
Around 15 kilometres east-north-east, the sky is Bortle 8, making this a poor short-distance option despite some improvement over the city itself. Farther out, this becomes one of the better escape directions, with dark skies reached at around 100 kilometres.
east - poor
At about 15 kilometres east of Fontana, the sky remains Bortle 9, so there is very little immediate relief from light pollution. Conditions improve steadily farther out, with a good observing sky appearing by around 100 kilometres and genuinely dark skies only much farther on.
east-south-east - poor
Roughly 15 kilometres east-south-east, the sky is still Bortle 8, so this is not a strong direction for nearby observing. It takes a long outward run before this sector becomes truly dark, with that step reached at around 200 kilometres.
south-east - poor
At around 15 kilometres south-east, the sky is Bortle 8, so local observing remains heavily compromised by brightness. Farther out this direction does improve to about Bortle 4 by around 100 kilometres, but genuinely dark skies are not reached within the sampled distance.
south-south-east - poor
About 15 kilometres south-south-east of the city, the sky is still Bortle 9, offering little improvement for a quick session. It does get somewhat better farther out, but genuinely dark skies are not reached within the sampled distance in this direction.
south - poor
At roughly 15 kilometres south, conditions are Bortle 8, so the southern sky is still strongly washed with light. There is some worthwhile improvement farther out, reaching about Bortle 4 by around 200 kilometres, but genuinely dark skies are not within the sampled radius.
south-south-west - poor
Around 15 kilometres south-south-west, the sky remains Bortle 8, so this is still a poor nearby escape from the city glow. It improves markedly with distance, with genuinely dark skies reached at around 200 kilometres.
south-west - poor
At about 15 kilometres south-west, the sky is still Bortle 9, making this one of the least promising directions close to the city. Darker country does exist much farther out, but genuinely dark skies only arrive at around 200 kilometres.
west-south-west - poor
Roughly 15 kilometres west-south-west, the sky remains Bortle 9, showing how strongly the urban glow extends in this direction. A substantial journey is needed before conditions become genuinely dark, with that happening at around 200 kilometres.
west - poor
At around 15 kilometres west of Fontana, the sky is still Bortle 9, so there is almost no practical gain for stargazing nearby. Conditions improve only slowly, and genuinely dark skies are not reached until around 200 kilometres.
west-north-west - poor
About 15 kilometres west-north-west, the sky is Bortle 8, which is still poor for anything beyond brighter targets. This direction eventually improves a great deal, but genuinely dark skies do not arrive until around 200 kilometres out.
north-west - poor
At roughly 15 kilometres north-west, the sky is Bortle 7, so it is poor but a little less oppressive than the city core. Even so, genuinely dark skies are not reached within the sampled radius in this direction.
north-north-west - marginal
Around 15 kilometres north-north-west, the sky reaches Bortle 6, making this a marginal but noticeably better short-drive option. With a much longer journey, this direction eventually opens into genuinely dark skies at around 200 kilometres.
zenith - poor
Looking straight up from Fontana, the zenith is a poor Bortle 9 sky with an SQM of 17.85, so the background remains bright rather than properly dark. You can still pick out the main constellations and brighter stars overhead, but faint patterns are thinned out and the Milky Way is effectively invisible.
-
Near Nye County, Nevada
- Direction
- NNE
- Distance (km)
- 297.5
- SQM
- 21.62
- Bortle
- 3
Milky Way visible, broadband DSO imaging
-
Near Laughlin Township, Nevada
- Direction
- ENE
- Distance (km)
- 279.8
- SQM
- 21.45
- Bortle
- 3
Milky Way visible, broadband DSO imaging
-
Near San Bernardino County, California
- Direction
- NNE
- Distance (km)
- 79.7
- SQM
- 20.99
- Bortle
- 4
Bright nebulae, galaxies, narrowband imaging
Genuinely dark skies require a meaningful journey from Fontana rather than a quick hop out of town.
The nearest really useful improvement is about 80 kilometres to the north-north-east, near San Bernardino County, California, where skies reach Bortle 4. Closer in, conditions do improve in some directions, but they generally remain bright enough that faint deep-sky observing is still heavily compromised.
-
Within 100 km
- Place
- Near San Bernardino County, California
- Direction
- NNE
- Distance (km)
- 79.7
- SQM
- 20.99
- Bortle
- 4
-
Within 500 km
- Place
- Near Nye County, Nevada
- Direction
- NNE
- Distance (km)
- 297.5
- SQM
- 21.62
- Bortle
- 3
Long-term light pollution trend
Fontana's long-term trend points in the wrong direction for urban stargazing. The city's SQM has shifted from 18.34 in the earliest record to 17.85 in the latest one, a decline of about 0.49 over the period sampled.
That works out to an average trend of roughly -0.0365 SQM per year, suggesting a gradual brightening of the night sky rather than an abrupt change. The full record stays within a fairly tight range, from 17.81 to 18.42, so the city has been consistently bright throughout the period.
In practical terms, this means Fontana has not moved from one observing regime to another — it has remained an urban sky where bright targets dominate. The overall direction of travel, though, is towards a little less contrast and a little more washed-out sky background.
From within Fontana, urban-friendly targets are the clear winners. The Moon, planets, double stars and the brightest clusters can all provide rewarding sessions without needing especially dark skies.
A small number of showpiece deep-sky objects are still possible, especially compact and bright ones, but they need careful timing, good transparency and realistic expectations. Large faint nebulae and most galaxies lose contrast quickly against the bright background.
If you can travel to darker skies, the observing menu expands dramatically. That is when the Milky Way, richer meteor activity and much fainter deep-sky structure begin to come into their own.
- Moon
- planets
- double stars
- brightest open clusters
- bright nebulae such as M42
- the brightest globular clusters
- Milky Way
- faint galaxies
- broadband nebulae
- meteor showers
Can you see stars from Fontana?
Yes — you can still see stars from Fontana, including the brighter constellations and the more obvious seasonal patterns. But with an SQM of 17.85 and a Bortle 9 sky, the fainter stars are heavily washed out.
Can you see the Milky Way from Fontana?
For most observers within Fontana itself, no: the Milky Way is effectively lost in the city glow. You would need to travel well away from the urban sky to have a realistic chance of seeing it clearly.
What Bortle class is Fontana?
Fontana is rated Bortle 9, which is an inner-city level of sky brightness. In practice that means bright targets do well, while faint deep-sky observing is very limited from within the city.
What is the SQM in Fontana?
Fontana has an SQM reading of 17.85. That indicates a bright night sky with much lower contrast than a rural observing site.
Where are the nearest darker skies to Fontana?
The nearest strong improvement in the supplied locations is near San Bernardino County, California, about 79.7 kilometres to the north-north-east, where conditions reach Bortle 4. For darker still, Near Laughlin Township, Nevada and Near Nye County, Nevada are both much farther away and reach Bortle 3.
Is Fontana good for astrophotography?
It can work for lunar, planetary and some narrow-field bright-object astrophotography, especially if you are experienced with light-polluted processing. For wide-field Milky Way work or faint deep-sky imaging, Fontana itself is a difficult base and darker locations are much better.
How far do you need to drive from Fontana for better stargazing?
For a clearly worthwhile improvement, you are looking at about 80 kilometres to reach Bortle 4 conditions near San Bernardino County, California. Truly dark skies take a much longer trip, with the nearest listed Bortle 3 sites roughly 280 to 300 kilometres away.