Fort Collins Stargazing & Astronomy Report
Light pollution and stargazing locations near Fort Collins
- City
- Fort Collins
- Country
- United States
- Latitude
- 40.5853
- Longitude
- -105.0844
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 19.22
- Bortle class
- Class 7 (Class 7)
- Darkness Quotient
- 36%
- Dataset
- March 2026
Suburban/urban transition
Stargazing in Fort Collins
Fort Collins is a lively university city in northern Colorado, set against the Front Range and known for its outdoor culture and fast-growing urban edge.
The city generally experiences High Light Pollution, with a Darkness Quotient of 36% — making it brighter than many smaller western towns, though still better placed than the most intensely lit major metros.
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 still be tried with care, but faint galaxies and low-contrast nebulae are largely washed out by the city glow.
There is a worthwhile improvement not far from town in several directions, especially west and north, where reasonable darker skies begin at around 25 kilometres. For truly impressive darkness, though, you are looking at a much longer journey of about 260 kilometres west-north-west to Near Sweetwater County, Wyoming.
The map shows Fort Collins as a pronounced bright core, with a hot pink-white centre surrounded by red, yellow and green halos that spread well beyond the urban area. That pattern is typical of a city whose skyglow dominates its immediate surroundings, especially close to the built-up centre.
The quickest drop-off in brightness appears toward the west and north-west, where the colours fade more rapidly into blue and then much darker tones. North also looks promising, with the urban halo thinning out sooner than it does in the more built-up southern and south-eastern sectors.
By contrast, the south, south-east and parts of the east sit within a broader field of scattered light domes and grey glow, suggesting more persistent artificial brightness on those horizons. Overall, Fort Collins stands out clearly from its surroundings, but it is not isolated: the wider region contains many smaller pools of light, so the very darkest sky is found well beyond the immediate urban fringe.
How the sky overhead feels from the city
Looking straight up from Fort Collins, the sky is bright enough that the familiar constellations remain easy to trace, but the background never becomes properly black. The zenith sits in Bortle 7 territory, so the overhead view still carries an urban glow rather than a truly dark-sky appearance.
In practice, this means brighter star patterns, the Moon and planets stand out well, while subtler star fields look thinned out. The Milky Way is generally not a realistic naked-eye sight from the city itself, and the contrast needed for faint nebulae or galaxies is largely missing.
Observers will usually get the best impression by concentrating on compact bright targets and waiting for transparent nights. Even then, the sky overhead is much better for casual stargazing and lunar or planetary observing than for hunting delicate deep-sky detail.
north - good
About 15 kilometres north of Fort Collins, the sky is already in good shape at Bortle 4, making this one of the better quick-drive directions. Genuinely dark skies arrive quite soon beyond that, with Bortle 3 conditions reached at around 25 kilometres and even darker conditions farther out.
north-north-east - marginal
At around 15 kilometres north-north-east, conditions are still marginal at Bortle 6, so the horizon remains noticeably affected by local skyglow. The improvement is rapid farther out, though, with Bortle 3 reached at around 25 kilometres.
north-east - fair
Around 15 kilometres to the north-east, the sky is fair at Bortle 5, so brighter deep-sky targets begin to look more comfortable but the background is still evident. A more meaningful improvement comes farther on, with Bortle 3 conditions reached at about 50 kilometres.
east-north-east - fair
At roughly 15 kilometres east-north-east, the sky is fair at Bortle 5, giving a modest but not dramatic improvement over the city. Better conditions build steadily in this direction, with Bortle 3 reached at around 50 kilometres.
east - fair
About 15 kilometres east of Fort Collins, the sky is fair at Bortle 5, so brighter clusters and showpiece objects become easier but the horizon still carries urban influence. This direction improves more gradually, with truly dark conditions not appearing until around 100 kilometres out.
east-south-east - marginal
At around 15 kilometres east-south-east, conditions remain marginal at Bortle 6, with obvious glow still affecting the sky. There is some improvement with distance, but genuinely dark skies are a long way off here, only arriving at around 200 kilometres.
south-east - marginal
Roughly 15 kilometres south-east of the city, the sky is still marginal at Bortle 6, so this is not one of the strongest quick-escape directions. It does improve eventually, but Bortle 3 darkness is only reached at around 100 kilometres.
south-south-east - poor
At around 15 kilometres south-south-east, the sky remains poor at Bortle 7, with strong light pollution still dominating the view. A major improvement is possible much farther out, but you need to travel about 200 kilometres before reaching Bortle 3 conditions.
south - marginal
About 15 kilometres south of Fort Collins, conditions are marginal at Bortle 6, so the sky remains distinctly bright for serious deep-sky work. Genuinely dark skies are not reached within the sampled range in this direction, although the far distance does improve to Bortle 4.
south-south-west - fair
At roughly 15 kilometres south-south-west, the sky is fair at Bortle 5, offering a modest improvement over the city itself. This direction does eventually become very dark, but only after a long drive of around 200 kilometres.
south-west - fair
Around 15 kilometres to the south-west, the sky is fair at Bortle 5, suitable for brighter deep-sky observing with some compromise. A stronger step up follows at about 50 kilometres, where conditions reach Bortle 3.
west-south-west - good
At about 15 kilometres west-south-west, the sky is already good at Bortle 4, making this one of the most practical directions for a quick observing run. Darker Bortle 3 sky arrives at around 25 kilometres, with still better darkness farther out.
west - good
Roughly 15 kilometres west of the city, the sky is good at Bortle 4, so this is a strong direction for a short trip. It improves quickly too, reaching Bortle 3 at around 25 kilometres and Bortle 2 farther beyond.
west-north-west - good
At around 15 kilometres west-north-west, conditions are good at Bortle 4, with a noticeably cleaner sky than over the city. Darker Bortle 3 conditions appear at about 25 kilometres, and excellent darkness follows farther out.
north-west - good
About 15 kilometres north-west of Fort Collins, the sky is good at Bortle 4, offering one of the better nearby improvements. Bortle 3 arrives at around 25 kilometres, and the direction continues to darken beyond that.
north-north-west - good
At roughly 15 kilometres north-north-west, the sky is good at Bortle 4, making this another rewarding quick-drive direction. Genuinely dark conditions are reached at around 25 kilometres, after which the sky improves further still.
zenith - poor
Looking straight up from Fort Collins itself, the zenith is poor by dark-sky standards, sitting at Bortle 7 with a noticeably bright background. Familiar constellations still show well enough, but the finer texture of the Milky Way is generally lost and the city glow limits faint-star visibility.
-
Near Sweetwater County, Wyoming
- Direction
- WNW
- Distance (km)
- 260.4
- SQM
- 21.77
- Bortle
- 2
Milky Way, faint nebulae, deep-sky imaging
-
Near Garfield County, Colorado
- Direction
- WSW
- Distance (km)
- 263.1
- SQM
- 21.66
- Bortle
- 3
Milky Way visible, broadband DSO imaging
-
Near Converse County, Wyoming
- Direction
- SSW
- Distance (km)
- 268.7
- SQM
- 21.64
- Bortle
- 3
Milky Way visible, broadband DSO imaging
Fort Collins is reasonably well placed for a quick escape to noticeably darker skies, but truly dark sky conditions still require a substantial journey.
The nearest listed standout site is Near Sweetwater County, Wyoming, about 260 kilometres to the west-north-west, where conditions reach Bortle 2. Closer to the city, the most useful improvement comes surprisingly quickly in western and northern directions, where the sky becomes good for general deep-sky observing after a relatively short drive.
-
Within 500 km
- Place
- Near Sweetwater County, Wyoming
- Direction
- WNW
- Distance (km)
- 260.4
- SQM
- 21.77
- Bortle
- 2
Long-term light pollution trend
Fort Collins has been fairly stable in the long run, though the overall direction is slightly brighter rather than darker. The earliest reading in the record is 19.33 SQM, compared with 19.22 SQM in the latest data, which points to a modest decline in sky quality over time.
The fitted trend is small, so this is not a dramatic change from year to year. Even so, across 75 datasets the city sits firmly in the brighter suburban-to-urban range, with occasional better periods but no sign of a sustained improvement.
The full historical spread runs from 19.03 SQM at the bright end to 21.73 SQM at the dark end, showing that conditions in the wider record can vary a lot. For local observers, that means night-to-night transparency and direction of view still matter, but the background sky from within the city remains consistently bright enough to limit faint-object work.
From within Fort Collins, the city sky is best suited to bright, high-contrast targets. The Moon, planets, double stars and the brightest open clusters are the most rewarding objects for regular observing sessions.
A few headline deep-sky objects are still possible if you choose transparent nights and use some magnification carefully. The Orion Nebula and the brightest globular clusters can show up, but they will not have the contrast or surrounding star field you would expect under darker skies.
For the Milky Way, faint galaxies, broad nebulae and meteor watching, a trip out of the city makes a huge difference. Fort Collins benefits from useful darker directions nearby, so even a relatively short drive can noticeably widen the range of worthwhile targets.
- Moon
- planets
- double stars
- brightest open clusters
- Orion Nebula (M42)
- brightest globular clusters
- a handful of other showpiece deep-sky objects
- Milky Way
- faint galaxies
- broadband nebulae
- meteor showers
Can you see stars from Fort Collins?
Yes — plenty of brighter stars and the main constellations are visible from Fort Collins. The city sky is bright enough, though, that fainter stars are washed out compared with a darker rural site.
Can you see the Milky Way from Fort Collins?
Usually not from within the city itself. With Fort Collins at Bortle 7 and SQM 19.22, the Milky Way is generally overwhelmed by skyglow.
What Bortle class is Fort Collins?
Fort Collins is Bortle Class 7, described as a suburban-to-urban transition sky. In practical terms, that means bright-target observing is fine, but faint deep-sky work is heavily limited.
What is the SQM reading for Fort Collins?
The current SQM reading is 19.22. That indicates a fairly bright night sky by amateur astronomy standards, with reduced contrast for faint objects.
Where are the nearest dark skies from Fort Collins?
The nearest listed truly dark site in the supplied data is Near Sweetwater County, Wyoming, about 260.4 kilometres west-north-west of the city, where conditions reach Bortle 2. For a quicker improvement, western and northern directions become noticeably better after a much shorter drive.
Is Fort Collins good for astrophotography?
It can be good for lunar, planetary and brighter deep-sky astrophotography, especially with filters and careful processing. For wide-field Milky Way work or faint nebulae, you will get far better results away from the city lights.
How far do you need to drive from Fort Collins for better stargazing?
A noticeable improvement comes quite quickly in some directions, especially west and north, where good rural sky begins at around 25 kilometres. For truly dark sky conditions comparable to top observing locations, the supplied nearby-site data points to a journey of about 260 kilometres.