How to plan your Northern Lights trip and why night sky darkness matters more than you think
Seeing the Northern Lights is often described as a dream. In practice, it is a combination of the right place, the right time, and a little patience.
When planning a trip to Lapland around Northern Lights, most travellers focus on the season or the weather. Both of course matter, but there is one factor that shapes the experience more than many realise, and that is the darkness of the night sky. This is also where light pollution maps become useful. They make something seemingly abstract, like the darkness of the night sky, visible and comparable.
Start with the night sky instead of the destination
Before choosing a hotel or a city, it helps to understand one simple concept: not all cities night skies are equal. Two locations in Lapland can be only tens of kilometres apart, yet offer very different night sky conditions. The difference comes from everyday artificial light: streetlights, buildings, and reflected glow in the atmosphere.
To describe the amount of light pollution in the night sky, astronomers and photographers use two main measurements: the Bortle scale (1-9) and the SQM value (Sky Quality Meter).
These numbers translate directly into what you can actually see.
- In bright cities: only a few stars
- In darker rural areas: thousands of stars and visible auroras
- In truly dark areas: structure, movement, and colour become clearer
Here's how you can read a light pollution map - and don't worry you do not need to be an expert, these two numbers are enough:
- Bortle scale (1 - 9) - Lower numbers mean darker skies.
- 1 - 3 → very dark, ideal for auroras
- 4 - 5 → still good, some light nearby
- 6+ → bright sky, weaker visibility
- SQM (Sky Quality Meter) - Higher numbers mean more natural darkness.
- ~21.5+ → very dark
- ~21.0 → good rural sky
- below 20 → light pollution starts to dominate
These values translate directly into what you experience: how many stars you see, how clearly the sky opens, and how strong the aurora appears.
A practical comparison between Rovaniemi vs Pyhä
To understand this in a concrete way, it helps to compare two typical locations in Finnish Lapland.
In the centre of Rovaniemi, the night sky is shaped by urban light. Measurements place it in the higher end of the Bortle scale, with a relatively low SQM value. In these conditions, only the brightest stars are visible, and the Milky Way does not appear. This does not mean that the Northern Lights cannot be seen. They can, but the visual contrast is lower, and the finer details are often lost.
In Pyhä, the situation is different. The area is smaller, and artificial light is more limited. Around Sunday Morning Resort, the sky falls into a moderate range on the Bortle scale, with significantly higher SQM values. Here, the constellations are easier to follow, and the aurora appears with clearer shape and movement.
A short distance away from the resort, the environment becomes darker still. Within roughly five to ten kilometres, the sky reaches a low light pollution level typical of rural Lapland. In these conditions, the Milky Way is visible across the sky, and the number of visible stars increases several times over.
Rovaniemi city center
- Bortle: 8.6 (very high light pollution)
- SQM: 17.99
- Visible stars: < 200
- Milky Way: not visible
This is a typical city sky. The horizon glows, and even strong auroras can look faint.
Pyhä, at Sunday Morning Resort
- Bortle: 4.3 (moderate)
- SQM: 21.22
- Visible stars: 1,000 - 2,000
- Milky Way: visible, though softer in detail
At Sunday Morning Resort, you are already in a different kind of night. Here, the sky begins to opens up. You can follow constellations, and auroras begin to show their shape more clearly.
And just a little further into the landscape (4.5-9 km from the resort, depending on the aurora safari)
- Bortle: 3.3 - 3.7 (low light pollution)
- SQM: up to 21.81
- Visible stars: 3,000–5,000
- Milky Way: clear across the sky
This is what many travellers are actually hoping to experience: a quiet, dark sky where the aurora has pleanty of space to move and appear.
What does this mean in practice?
In locations with higher light pollution, most aurora tours often drive 20 - 30 km away from the city to reach conditions similar to what you already have in Pyhä.
In Pyhä, those same conditions are already part of the surrounding landscape and you can reach them in minutes. Most of the times you can simply step outside at the right moment.
How to use light pollution maps yourself?
For independent travellers, light pollution maps offer a practical way to compare locations before booking. They allow you to zoom into a region and see how brightness changes across the landscape. Urban areas appear as bright zones, while rural regions gradually shift into darker tones.
When reading these maps, it is useful to look beyond the destination itself and consider its surroundings. A location may be well positioned if darker areas are easily accessible nearby. The goal is not necessarily to find the absolute darkest place, but to understand how much effort is required to reach a clear night sky.
If you are planning your trip independently, this is worth doing:
- Open a light pollution map (e.g. Light Pollution Map, Dark Site Finder)
- Look for areas in the range of:
- Bortle 1-4
- SQM above ~21.1
- Avoid large urban areas unless you plan to travel out each night
- Check how far you need to move from your accommodation to reach darker zones
A place can look remote on a map and still have bright skies, but with these numbers you can see the nightly reality more clearly.
Other factors that are good to keep in mind:
Once you have chosen a dark location, planning the rest of your trip becomes a bit simpler. Here are a few ofher things that can affet you chances of seeing the Northern Lights:
- Season: September to March offers the best chances
- Time of night: usually between 21:00 - 02:00
- Weather: clear skies are essential
- Solar activity: stronger activity makes brighter displays
These all matter. But without darkness, even strong auroras can remain hidden.
A quieter way to experience the Northern Lights
In Pyhä, the landscape does not compete with the sky. There are no large city lights, no constant movement. You can just relax amidst the open space, private forest, and the Pyhäjärvi lake.
When you step outside, your eyes take a moment to adjust and then the stars appear gradually. And sometimes the aurora follows. In Pyhä, there is no need to rush between locations or spend hours driving into darkness, as the dark night skies are already there.
And that is often the difference between chasing the Northern Lights and simply being present when they arrive. If you are planning your trip around this one idea, and choosing to follow true dark skies, you are already much closer to seeing what you came for.
Summary: planning your Northern Lights trip
If you are deciding where to go in Lapland, start here:
- Check a light pollution map before choosing your destination
- Look for areas with Bortle 1-4 and SQM above ~21
- Consider how far you need to travel each night to reach darker spots
- Choose a place where the sky is already clear of artificial light
Once that is in place, everything else becomes easier. And when the moment comes, you are already in the right place.
