Portland Stargazing & Astronomy Report
Light pollution and stargazing locations near Portland
- City
- Portland
- Country
- United States
- Latitude
- 45.5051
- Longitude
- -122.6750
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 18.18
- Bortle class
- Class 8 (Class 8)
- Darkness Quotient
- 24%
- Dataset
- March 2026
City sky
Stargazing in Portland
Portland is a major Pacific Northwest city in the north-western United States, known for its river setting, creative culture and broad urban footprint. The city generally experiences High Light Pollution, with a Darkness Quotient of 24% — making it brighter than good rural observing areas, though not quite as washed out as the most intensely lit global megacities.
In practical terms, brighter targets are the most realistic from within the city: the Moon, planets, double stars and the brightest open clusters. Faint deep-sky objects are heavily suppressed by the urban glow, with only a small handful of standout showpieces showing through with compromise.
Really dark skies are not close at hand from Portland, and a worthwhile improvement usually means leaving the metro glow properly behind. The nearest strong step up is about 75 kilometres to the west-north-west near Clatsop County, Oregon, where conditions become genuinely dark, while the nearest reasonable Bortle 4-level option is around 105 kilometres to the south-west near Polk County, Oregon.
The map shows Portland as a strong bright core, with an intense pink-red centre surrounded by a broad yellow, green and blue halo. That pattern is typical of a large urban area whose light dome spreads well beyond the city itself, so the sky remains affected for quite a long distance in most directions.
The most obvious darker regions appear farther out to the east and south-east, where the colours fade into darker grey and black more decisively. There are also darker areas away from the city to the west and north-west, but the urban glow still forms a wide transition zone around Portland before cleaner skies emerge.
Compared with its surroundings, Portland stands out as one of the dominant sources of sky brightness in the map crop. Nearby smaller bright patches are visible around it, but the city’s own light dome is broader and more intense, which is why observers usually need a meaningful drive before the sky improves dramatically.
What the sky overhead is like
Looking straight up from Portland, the sky is firmly in the city-sky category, with a zenith reading of 18.18 SQM. Even overhead, the background sky is bright enough to wash out much of the faint detail that would stand out easily from a darker site.
The familiar brighter constellations are still there, and the Moon and planets remain easy targets, but the sky lacks the rich star-field texture seen from the countryside. The Milky Way is generally lost, and many fainter stars that would define constellation shapes more fully simply do not show well.
For casual observing this still leaves plenty to enjoy, but for nebulae, galaxies and wide-field night-sky views, Portland’s overhead sky is much better treated as a starting point than a final destination.
north - poor
At about 15 kilometres north of Portland, the sky is still poor, with Bortle 8 conditions very similar to the city itself. The situation improves markedly farther out, with genuinely dark skies reached at around 100 kilometres in this direction, and a very solid improvement already apparent by about 50 kilometres.
north-north-east - poor
At roughly 15 kilometres to the north-north-east, the sky remains poor under Bortle 8 conditions. A much better sky develops farther out, with good rural conditions by around 50 kilometres and genuinely dark skies at about 100 kilometres.
north-east - poor
Around 15 kilometres to the north-east, Portland’s light dome is still dominant and the sky rates as poor at Bortle 8. Conditions improve steadily beyond the urban fringe, with good skies by about 50 kilometres and genuinely dark conditions at around 100 kilometres.
east-north-east - poor
At about 15 kilometres east-north-east, the sky is still poor, remaining in Bortle 8 territory. This is one of the more promising directions overall, with genuinely dark skies reached by around 50 kilometres and remaining dark farther out.
east - poor
At roughly 15 kilometres east of the city, the sky is still poor at Bortle 8. A strong improvement appears farther out, with genuinely dark skies reached at about 50 kilometres and even darker conditions available deeper into this direction.
east-south-east - poor
At around 15 kilometres east-south-east, the sky is still heavily affected by Portland’s glow and rates as poor, though it is beginning to improve. Genuinely dark skies arrive by about 50 kilometres in this direction, making it one of the faster routes to a proper step up in quality.
south-east - poor
At about 15 kilometres south-east of Portland, the sky is still poor at Bortle 8. The improvement becomes much more noticeable beyond the immediate metro area, with genuinely dark skies reached at around 50 kilometres.
south-south-east - poor
At roughly 15 kilometres south-south-east, the sky remains poor under Bortle 8 conditions. It improves well with distance, reaching good rural quality by about 50 kilometres and genuinely dark skies at around 100 kilometres.
south - poor
At around 15 kilometres south of the city, the sky is still poor, though slightly less harsh than the brightest parts of Portland’s glow, at Bortle 7. A worthwhile improvement develops farther out, with good skies by about 50 kilometres and genuinely dark conditions at around 100 kilometres.
south-south-west - poor
At about 15 kilometres south-south-west, the sky is still poor at Bortle 8. This direction improves more slowly than some others, and genuinely dark skies do not arrive until roughly 200 kilometres out, although the sky becomes fair by around 50 kilometres.
south-west - poor
At roughly 15 kilometres south-west of Portland, the sky is still poor, sitting at Bortle 7. There is improvement with distance, but it is more gradual at first, with genuinely dark skies reached at around 100 kilometres.
west-south-west - poor
At around 15 kilometres west-south-west, the sky remains poor at Bortle 7. Conditions become good by about 50 kilometres and genuinely dark by around 100 kilometres, so this is a viable escape route once you are well clear of the city glow.
west - poor
At about 15 kilometres west of Portland, the sky is still poor under Bortle 8 conditions. A major improvement follows farther out, with good skies by around 50 kilometres and genuinely dark conditions at about 100 kilometres.
west-north-west - poor
At roughly 15 kilometres west-north-west, the sky rates as poor at Bortle 7. It improves well once you are farther from the metro area, with good skies by about 50 kilometres and genuinely dark conditions at around 100 kilometres.
north-west - poor
At around 15 kilometres north-west of the city, the sky is poor at Bortle 7, though already a little better than central Portland. It becomes fair within a modest further drive, good by about 50 kilometres, and genuinely dark at around 100 kilometres.
north-north-west - poor
At about 15 kilometres north-north-west, the sky is still poor under Bortle 8 conditions. It improves substantially beyond the near outskirts, with good skies by roughly 50 kilometres and genuinely dark conditions at around 100 kilometres.
zenith - poor
Looking straight up from Portland, the zenith sky is poor, corresponding to Bortle 8. The brighter constellations, Moon and planets remain visible, but the background glow suppresses faint stars and wipes out the Milky Way for most observers.
You can still pick out familiar seasonal patterns overhead, though they appear thinner and less richly starred than they would from the countryside. The overall impression is of a bright urban sky rather than a truly dark night.
-
Near Klamath County, Oregon
- Direction
- SSE
- Distance (km)
- 279.6
- SQM
- 21.70
- Bortle
- 2
Milky Way, faint nebulae, deep-sky imaging
-
Near Clatsop County, Oregon
- Direction
- WNW
- Distance (km)
- 75.5
- SQM
- 21.51
- Bortle
- 3
Milky Way visible, broadband DSO imaging
-
Near Polk County, Oregon
- Direction
- SW
- Distance (km)
- 106.8
- SQM
- 21.27
- Bortle
- 4
Bright nebulae, galaxies, narrowband imaging
Genuinely dark skies require a meaningful drive from Portland rather than a quick hop to the edge of town. The nearest strong improvement is about 75 kilometres to the west-north-west near Clatsop County, Oregon, where skies reach Bortle 3, while the nearest reasonable Bortle 4 site is about 105 kilometres to the south-west near Polk County, Oregon.
In several directions the sky does improve after leaving the city, but the first really noticeable step-change tends to come only once you are well beyond the main urban glow.
-
Within 100 km
- Place
- Near Clatsop County, Oregon
- Direction
- WNW
- Distance (km)
- 75.5
- SQM
- 21.51
- Bortle
- 3
-
Within 200 km
- Place
- Near Polk County, Oregon
- Direction
- SW
- Distance (km)
- 106.8
- SQM
- 21.27
- Bortle
- 4
-
Within 500 km
- Place
- Near Klamath County, Oregon
- Direction
- SSE
- Distance (km)
- 279.6
- SQM
- 21.70
- Bortle
- 2
Long-term sky trend
Portland’s long-term trend is broadly stable, with a slight improvement in measured darkness over time rather than a decline. The earliest reading in the series was 17.99 SQM, while the latest stands at 18.18 SQM.
Across 76 datasets, the mean value is 18.27 SQM, with a gentle trend of +0.0141 SQM per year. That is a small change in practical observing terms, so the city still behaves much like a bright urban sky for most observers.
The wider range in the record, from 17.99 up to 22.00 SQM, reflects changing conditions across the broader dataset rather than a transformation of the city centre itself. In day-to-day use, Portland remains a place where brighter celestial targets are the dependable choice from within the city.
From within Portland, the most rewarding targets are the bright, high-contrast ones that can punch through urban skyglow. The Moon, planets, double stars and the brightest open clusters are the most dependable choices for a satisfying session.
A few classic deep-sky showpieces can still be attempted with care, especially with binoculars or a telescope, but expectations need to stay realistic. Bright objects such as M42 or the very brightest globular clusters may be possible, while most galaxies and faint nebulae are badly affected.
For wide-field skywatching, meteor observing and anything involving subtle low-contrast detail, a darker site outside the city will make a dramatic difference. That is where the Milky Way, richer star fields and more delicate deep-sky objects begin to come back into view.
- 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 Portland?
Yes — you can still see stars from Portland, especially the brighter constellations and the more prominent stars in each seasonal pattern. The city glow reduces the overall number quite noticeably, so the sky looks much thinner than it would from the countryside.
Can you see the Milky Way from Portland?
In general, no — the Milky Way is usually lost in Portland’s urban skyglow. You would normally need to travel out to a much darker location before it becomes an obvious naked-eye sight.
What Bortle class is Portland?
Portland is Bortle Class 8, which corresponds to a bright city sky. In practice, that means the sky is best suited to bright objects rather than faint deep-sky observing.
What is the SQM reading for Portland?
The measured sky brightness is 18.18 SQM. That is firmly in bright-urban territory, consistent with a sky where artificial light strongly affects what you can see.
Where are the nearest dark skies from Portland?
The nearest genuinely dark site listed here is Near Clatsop County, Oregon, about 75.5 kilometres to the west-north-west, where conditions reach Bortle 3. If you are specifically looking for a reasonable Bortle 4 step up, Near Polk County, Oregon is about 106.8 kilometres to the south-west.
Is Portland good for astrophotography?
It can be good for lunar and planetary astrophotography, and for some brighter deep-sky targets with the right filters and careful processing. For Milky Way photography or faint nebula work, you will get far better results by leaving the city and heading for darker skies.
How far do you need to drive from Portland for darker skies?
For a genuinely substantial improvement, you are usually looking at roughly 75 to 105 kilometres depending on direction and how dark you want the sky to be. Some directions improve faster than others, but the city’s light dome is broad enough that a proper dark-sky trip is more than just a quick drive to the edge of town.