Northern lights in Tromsø: when, where and which tour

Seeing the northern lights is on almost every newcomer's list, and Tromsø is the classic place to try. Visit Tromsø, the official tourist board, says the region sits directly below the northern lights oval and is "one of the best places on earth" to see them. That still doesn't make the aurora reliable. This guide covers what the official sources say about timing, places to look and how to pick a tour, so you can plan a trip without paying for things you don't need.

When is the season?

According to Visit Tromsø, the northern lights may be visible in the Tromsø region from late August to early April, whenever the sky is dark and clear enough. Most organised northern lights activities don't start until early September, and tours usually run until early April.

A few things worth knowing before you pick dates:

• Time of night: the lights can appear at any time during the night, but Visit Tromsø says they are often most active between about 20:00 and 02:00. The Fjellheisen cable car gives a slightly wider window, from 18:00 to 02:00.
• Polar night: from late November to mid-January the sun stays below the horizon all day. It isn't pitch black, though. The sky brightens around midday with dusk-and-dawn colours, which many people find just as memorable as the aurora.
• Autumn is milder: Visit Tromsø points out that autumn is not as cold as midwinter, which makes it a good option if you'd like a "milder" aurora trip, and the autumn colours can be spectacular.
• Solar activity matters less than you think: you will often read that a solar maximum makes the lights stronger. Visit Tromsø says research shows this has little impact directly below the oval, where Tromsø is. A dark, clear sky matters far more.

The single best piece of advice from the tourist board is to give it time. The more nights you spend in Tromsø, the better the chance that the aurora and the weather line up. If you only have one evening, treat any sighting as a bonus.

How to read the forecast

The Norwegian weather service Yr has an aurora forecast in its app and on its website (look under the "Nearby" tab). It gives:

• a nowcast from 0 to 100% that predicts activity 30–90 minutes ahead, and the app can send you a push notification when the nowcast goes above 30%;
• an aurora index from "no activity" to "very high activity", based on the Kp index and your latitude. The Kp index runs from 0 (low) to 9 (an intense geomagnetic storm).

Yr's threshold table puts the Kp value needed to see the aurora at 0 for latitudes between 66° and 74°, the band Tromsø lies in. In other words, you don't need a big storm this far north. What usually decides your night is cloud. Yr notes that a high cloud layer can be transparent, while low clouds are often dense and block the view. Even on a cloudy evening a hole can open up, so Visit Tromsø's advice is not to give up too early.

Where to look on your own

You can often see the northern lights from downtown Tromsø, sometimes even from a hotel window. Visit Tromsø still recommends getting away from the bright city lights to somewhere with little or no artificial light.

Two easy options without a tour:

• Prestvannet, a lake in the middle of Tromsøya, is named in Visit Tromsø's FAQ as one of the darker places in town on clear nights.
• Fjellheisen cable car goes from Solliveien in Tromsdalen up to Storsteinen, 421 metres above sea level, in about four minutes. It's open 09:00–00:00 every day and markets its top station as a place to watch the aurora over the city. It's a good choice if you're short on time or prefer to explore independently.

Whichever you choose, dress for standing still in the cold. Visit Tromsø specifically warns that you'll often spend time sitting and waiting, so bring more layers than you think you need.

Choosing a northern lights tour

Visit Tromsø's main recommendation is to go with a local guide. Guides watch the weather, cloud cover and aurora activity, and they can drive away from the city to look for clearer skies when local conditions are poor. The tourist board splits tours into two types:

• Northern lights hunts go by car, minibus or bus, and the whole focus is finding the lights.
• Northern lights experiences combine the hunt with an activity such as dog sledding, snowmobiling or a night in a lavvu (a Sámi tent). Here the activity is the main event and the aurora is a bonus. Providers of these activities often lend out thermal suits and winter boots.

Before you book, Visit Tromsø suggests comparing:

1. Group size: a small minibus feels very different from a full coach.
2. Duration and how far the tour may drive in search of clear skies.
3. Transport and level of comfort, which vary a lot between tours.
4. What's included: warm clothing, food, photos, hotel drop-off and access to toilets.

Book early. Visit Tromsø says popular departures and smaller tours can sell out, especially in the busiest winter months, and accommodation fills up too. If you'd rather wait, the official tourist information office in Tromsø can help you check what's available once you're there.

A simple plan for newcomers

• Pick 3 or more nights between September and March if you can, rather than a single night.
• Check Yr for cloud and the aurora nowcast each afternoon, and keep notifications on.
• Try the free options first (a dark spot like Prestvannet, or a look up on the way back to your hotel), and if you want a guide, book early and keep a flexible night or two in case of cloud.
• Dress in wool layers, warm boots, a hat and mittens. You'll be standing still for long periods.
• Want more winter ideas? See our beginner's guide to saunas and cold-water bathing, and browse other things to do in Tromsø on GetYourGuide Advertising/affiliate link.

Remember: the northern lights are a natural phenomenon, and nobody can guarantee them. Planning, patience and warm clothes improve your odds, but no guide, app or tour can promise a show.