Planning tool
How many nights do you need to see the northern lights?
It depends on the place far more than on the number. Three nights in Yellowknife beat a week in Tromsø, on sky alone.
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Choose a place, a month and a number of nights. The full table is below.
Counted from every stay of that length that started in that month between 2001 and 2024. Sky only: the aurora also has to be active.
Three, five and seven nights, all places
Share of stays with at least one usable night. Each cell reads 3 nights · 5 nights · 7 nights.
| Destination | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr |
|---|---|---|---|---|---|---|---|---|
| Tromsø | 38 · 53 · 65 | 34 · 47 · 56 | 36 · 49 · 59 | 35 · 50 · 60 | 43 · 57 · 67 | 36 · 48 · 56 | 21 · 31 · 39 | - |
| Reykjavík | 51 · 68 · 79 | 56 · 73 · 83 | 57 · 74 · 84 | 61 · 76 · 85 | 50 · 65 · 76 | 52 · 67 · 76 | 45 · 60 · 69 | 33 · 44 · 52 |
| Rovaniemi | 66 · 78 · 86 | 51 · 68 · 80 | 49 · 65 · 74 | 56 · 70 · 79 | 57 · 72 · 83 | 58 · 74 · 84 | 66 · 82 · 89 | - |
| Abisko | 38 · 52 · 65 | 40 · 54 · 66 | 51 · 68 · 79 | 55 · 71 · 81 | 61 · 77 · 87 | 58 · 75 · 85 | 54 · 69 · 79 | - |
| Kiruna | 67 · 79 · 86 | 61 · 77 · 87 | 58 · 73 · 80 | 57 · 74 · 83 | 65 · 80 · 88 | 65 · 80 · 87 | 72 · 87 · 94 | - |
| Levi | 64 · 78 · 86 | 47 · 63 · 75 | 47 · 60 · 68 | 46 · 60 · 71 | 53 · 69 · 80 | 52 · 68 · 79 | 58 · 74 · 83 | - |
| Saariselkä | 60 · 75 · 84 | 48 · 63 · 73 | 50 · 65 · 75 | 55 · 71 · 83 | 60 · 76 · 85 | 60 · 77 · 87 | 63 · 78 · 85 | - |
| Akureyri | 40 · 57 · 69 | 34 · 48 · 59 | 38 · 52 · 63 | 42 · 57 · 68 | 34 · 47 · 56 | 36 · 50 · 59 | 25 · 37 · 46 | - |
| Luleå | 70 · 84 · 90 | 69 · 83 · 91 | 57 · 72 · 80 | 57 · 69 · 78 | 51 · 67 · 77 | 49 · 66 · 77 | 27 · 37 · 44 | - |
| Fairbanks | 60 · 79 · 89 | 58 · 74 · 85 | 75 · 88 · 94 | 87 · 96 · 99 | 89 · 97 · 99 | 84 · 95 · 98 | 83 · 92 · 95 | 75 · 84 · 87 |
| Yellowknife | 82 · 94 · 99 | 62 · 76 · 85 | 65 · 79 · 87 | 88 · 95 · 98 | 89 · 97 · 99 | 94 · 98 · 99 | 90 · 95 · 98 | 69 · 80 · 86 |
| Whitehorse | 70 · 85 · 92 | 66 · 83 · 91 | 72 · 85 · 92 | 82 · 94 · 98 | 82 · 93 · 98 | 85 · 96 · 99 | 86 · 95 · 99 | 79 · 91 · 96 |
A usable sky means at least two dark hours in a row with half the sky or more free of cloud, over an area of about 110 km. It says nothing about solar activity, so it is not the chance of seeing the aurora. How we calculate this
What the calculator counts
For each place and month, we took every start date in the real day sequences of NASA POWER data from 2001 to 2024, and asked whether a stay of three, five or seven nights contained at least one usable night. A usable night means at least two dark hours in a row with half the sky or more free of cloud, averaged over a satellite cell about 110 km across. The figure is the share of stays that did.
Because the sequences are real, runs of bad weather are in there. That is why three nights do not give three times the odds of one.
A sky figure, not a sighting figure
The calculator knows about darkness and cloud. It does not know whether the aurora was active, and a satellite average over 110 km is not a reading at your viewing spot. A night we count as usable may have had no display. Tourism boards publish headline numbers with no dataset behind them, such as Explore Fairbanks's more than 90% for three nights, or Spectacular NWT's 98% over three nights. Ours measure something narrower and are not like for like.
Worked examples
In February, 19% of Tromsø nights had a usable sky and 72% of Yellowknife nights did. For stays:
- Three nights: Tromsø 36%, Yellowknife 94%.
- Seven nights: Tromsø 56%, Yellowknife 99%.
A week in Tromsø is still well behind three nights in Yellowknife. Rovaniemi in March shows the diminishing returns: 66%, 82% and 89% for three, five and seven nights. The first extra nights add the most. Whitehorse in February is close to Yellowknife, at 85%, 96% and 99%. Akureyri in January is at the other end, at 34%, 47% and 56%. See Tromsø and Yellowknife for their month-by-month figures.
Practical advice
Book the tour for your first night. A free retry or a discount on a second tour only helps if you still have nights left, and our guide to what happens if no aurora shows lists which listings offer what.
Choose the length by the figure, not by habit. Where three nights already reach 80% or more, as in Fairbanks, Yellowknife and Whitehorse from December to March, extra nights add little. Where three nights give 40% or less, a longer stay is worth it, but even seven nights in Tromsø in February stops at 56%.
The full method is on the methodology page. To see which months and places suit your dates, use when to go.
Common questions
How many nights do you need to see the northern lights?
On sky alone, it depends on where you stay. In February, three nights in Yellowknife gave at least one usable night in 94% of stays, while seven nights in Tromsø gave 56%. Solar activity is a separate matter, so no number of nights is a promise.
Is three nights enough in Tromsø?
Often not. Three-night stays in Tromsø had at least one usable night in between 21% (March) and 43% (January) of cases, depending on the month. Five or seven nights raise the figure, but only to 31% to 57% for five and 39% to 67% for seven.
Does a longer stay always help?
It always helps, but less each night. Yellowknife in February goes from 94% for three nights to 98% for five and 99% for seven. Tromsø in February goes from 36% to 48% to 56%, so the extra nights are worth more where the starting figure is low.
Do these figures include the aurora forecast?
No. They are historical sky statistics for 2001 to 2024 and say nothing about solar activity. For the forecast on a given evening, see our Tonight page.