Markham Stargazing & Astronomy Report

Light pollution and stargazing locations near Markham

City
Markham
Country
Canada
Latitude
43.8561
Longitude
-79.3370

Key Sky Quality Metrics

SQM (mag/arcsec²)
17.56
Bortle class
Class 9 (Class 9)
Darkness Quotient
19%
Dataset
March 2026

Inner city sky

Stargazing in Markham

Markham is a large suburban city in southern Ontario, part of the Greater Toronto Area and known for its fast growth, tech presence and dense urban development.

The city generally experiences Extreme Light Pollution, with a Darkness Quotient of just 19% — placing it among the more light-polluted urban locations in Canada.

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

Meaningfully darker skies do not appear close to hand, and a proper improvement needs a noticeable drive out of the urban belt. The nearest reasonable sky is about 65 kilometres away to the south, near Georgina, Ontario.

The map shows Markham sitting within a very bright urban complex, with intense pink-white and red tones merging into a broad belt of yellow and green light. In practice that means the city is not an isolated bright patch but part of a much larger continuous glow, so sky brightness remains high well beyond the immediate built-up area.

The darkest-looking regions on the map lie mainly to the north and north-west, where the colours fade through blue into darker grey-black tones. There are also some weaker pockets of improvement to the east and north-east, but they are interrupted by scattered bright settlements, so the transition to darker sky is uneven rather than clean.

To the south and south-west, the light dome stays broad and persistent, which fits the difficulty of escaping urban skyglow in those directions. Overall, Markham looks brighter than most of its immediate surroundings, but the whole region remains heavily illuminated until you travel well away from the city.

How the sky overhead behaves

Looking straight up from Markham, the overhead sky is bright enough that the familiar constellations remain visible but lack richness and contrast. The brightest stars can still punch through, yet fainter background stars quickly disappear into the grey-orange glow.

This sort of sky strongly favours casual observing of the Moon and planets, with only limited success on brighter deep-sky showpieces. Even near the zenith, where conditions are usually best, the sky remains bright rather than truly dark, so the sense of depth and star density never fully develops.

north - poor

About 15 kilometres north of Markham, the sky is still poor, around Bortle 7, so only brighter stars and the more obvious constellations stand out well. Conditions do improve steadily in this direction, but genuinely dark skies are not reached until roughly 200 kilometres out.

north-north-east - poor

At around 15 kilometres to the north-north-east, the sky remains poor at Bortle 7, with heavy skyglow still affecting contrast. This is one of the better escape routes, though, with genuinely dark conditions appearing at about 100 kilometres.

north-east - poor

Around 15 kilometres to the north-east, conditions are still poor at Bortle 7, so urban glow remains very noticeable. The sky improves usefully with distance, reaching good conditions by about 100 kilometres and genuinely dark sky only much farther out, around 200 kilometres.

east-north-east - poor

At roughly 15 kilometres east-north-east of the city, the sky is still poor, again around Bortle 7. There is a worthwhile improvement farther out, with good dark-sky territory reached at about 200 kilometres.

east - poor

Around 15 kilometres east of Markham, the sky is still poor at Bortle 7, with local glow very much present. It does improve with a longer journey, reaching good conditions by about 100 kilometres and darker skies farther beyond that.

east-south-east - poor

At roughly 15 kilometres east-south-east, the sky remains poor, around Bortle 8, so deep-sky observing is still heavily compromised. This direction improves more convincingly with distance, with genuinely dark sky appearing at about 100 kilometres.

south-east - poor

Around 15 kilometres to the south-east, the sky is still poor at Bortle 9 and heavily washed out by urban light. It does become noticeably better farther away, but genuinely dark skies are not reached within the sampled distance in this direction.

south-south-east - poor

At about 15 kilometres south-south-east of Markham, the sky remains poor at Bortle 9, with strong light pollution near the horizon and overhead. Conditions eventually improve a lot, but genuinely dark sky does not appear until around 200 kilometres out.

south - poor

Roughly 15 kilometres south of the city, the sky is still poor at Bortle 9 and among the brightest nearby directions. There is some improvement farther out, but genuinely dark skies are not reached within the sampled range in this direction.

south-south-west - poor

At around 15 kilometres south-south-west, conditions are poor at Bortle 9, with the urban light dome still dominant. The sky becomes better with a substantial drive, but genuinely dark conditions are not reached within the sampled distance.

south-west - poor

About 15 kilometres south-west of Markham, the sky is still poor at Bortle 9, so this is not a promising quick-drive direction. It only becomes genuinely dark much farther out, at around 200 kilometres.

west-south-west - poor

At roughly 15 kilometres west-south-west, the sky remains poor at Bortle 9, with little real escape from the city glow. There is improvement farther out, but genuinely dark skies are not reached within the sampled radius in this direction.

west - poor

Around 15 kilometres west of the city, the sky is still poor at Bortle 9 and strongly affected by light pollution. With a much longer drive it improves to good conditions by about 100 kilometres, and darker skies arrive farther beyond that.

west-north-west - poor

At about 15 kilometres west-north-west, the sky is poor at Bortle 8, so only brighter targets fare well. This direction becomes much more rewarding with distance, with genuinely dark conditions reached at about 100 kilometres.

north-west - poor

Roughly 15 kilometres north-west of Markham, conditions are still poor at Bortle 8. The sky does improve, but genuinely dark conditions are only reached after a long drive of around 200 kilometres.

north-north-west - poor

At around 15 kilometres north-north-west, the sky remains poor at Bortle 7, so the urban glow is still obvious. It improves with distance, but genuinely dark sky is only reached at about 200 kilometres.

zenith - poor

Straight overhead, Markham's zenith is poor at Bortle 9, with a measured brightness of 17.56 SQM. Looking up from the city, you can make out the main constellation patterns and the brighter stars, but the background sky is bright and washed out, with little chance of seeing the Milky Way from within the urban area.

  • Near Renfrew County, Ontario
    Direction
    NNE
    Distance (km)
    283.6
    SQM
    21.41
    Bortle
    3

    Milky Way visible, broadband DSO imaging

  • Near Unorganized North Nipissing, Ontario
    Direction
    ENE
    Distance (km)
    311
    SQM
    21.37
    Bortle
    3

    Milky Way visible, broadband DSO imaging

  • Near Georgina, Ontario
    Direction
    S
    Distance (km)
    65
    SQM
    20.83
    Bortle
    4

    Bright nebulae, galaxies, narrowband imaging

Genuinely darker skies require a meaningful drive from Markham rather than a quick hop to the edge of town.

The nearest good step up is about 65 kilometres to the south, near Georgina, Ontario, where conditions reach Bortle 4. For still darker skies, a much longer journey is needed, with Bortle 3 conditions available around 285 kilometres away near Renfrew County, Ontario.

Closer out, there is some gradual improvement in several directions, but the city glow remains strong enough that the real change comes only once you are well beyond the main urban area.

  • Within 100 km
    Place
    Near Georgina, Ontario
    Direction
    S
    Distance (km)
    65
    SQM
    20.83
    Bortle
    4
  • Within 500 km
    Place
    Near Renfrew County, Ontario
    Direction
    NNE
    Distance (km)
    283.6
    SQM
    21.41
    Bortle
    3

Long-term sky brightness trend

Markham's long-term record is broadly stable, with readings ranging from 16.89 to 21.76 SQM across 76 datasets. The current value of 17.56 SQM sits a little below the long-term mean of 17.89, which keeps the city firmly in very bright urban-sky territory.

The overall trend slope is slightly negative at -0.0105 SQM per year, suggesting a very gentle brightening over time rather than improvement. In practical terms, that is a small change year to year, but it points to conditions that have not meaningfully eased for deep-sky observing from within the city.

From within Markham, the best targets are bright, high-contrast ones that can cope with a luminous background sky. The Moon and planets are the clear standouts, and double stars also remain rewarding because light pollution affects them far less than faint nebulae and galaxies.

A few brighter deep-sky showpieces can still be tried with patience and realistic expectations, especially with binoculars or a modest telescope. For serious deep-sky observing, though, a darker site outside the city makes a dramatic difference.

If your goal is the Milky Way, subtle nebula detail, faint galaxies or the full richness of meteor showers, Markham's city sky is simply too bright. Those targets are much better saved for a proper dark-sky trip.

  • 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 Markham?

Yes — you can still see stars from Markham, especially the brighter ones and the main constellation patterns. However, the city is bright enough that many fainter stars disappear from view.

Can you see the Milky Way from Markham?

For most observers, no. With an SQM reading of 17.56 and a Bortle 9 sky, the Milky Way is effectively washed out from within the city.

What Bortle class is Markham?

Markham is Bortle 9, which is an inner-city sky and the brightest end of the common observing scale. That means skyglow dominates and limits deep-sky observing quite severely.

What is the SQM reading in Markham?

The measured sky brightness is 17.56 SQM. That is a bright urban reading, consistent with a sky where only the brighter stars and showpiece objects stand out well.

Where are the nearest dark skies to Markham?

The nearest reasonable dark-sky improvement is near Georgina, Ontario, about 65 kilometres to the south, where conditions reach Bortle 4. For darker still skies, Near Renfrew County, Ontario offers Bortle 3 conditions at about 284 kilometres to the north-north-east.

Is Markham good for astrophotography?

It can work for lunar, planetary and some narrowband imaging, but Markham is challenging for broadband deep-sky astrophotography. The bright background sky means fainter nebulae and galaxies are much easier from a darker site.

How far do you need to drive from Markham for better stargazing?

For a clear step up, you are looking at roughly 65 kilometres to reach Bortle 4 conditions near Georgina, Ontario. For a truly dark-sky experience, the journey is much longer, with Bortle 3 skies around 284 kilometres away near Renfrew County, Ontario.