score:8
If you are spending any night in a hotel or hostel in Tromsø before your hike, ask them if you can store your luggage there. I've done this several times in several countries and I've never been charged for it. Most recently I did so at a youth hostel in Trondheim, Norway. A friend has also done so at a hotel in Dombås even though he wasn't staying there at all (I think he did pay for it).
Just make sure the reception is open when you return to pick up your luggage!
Upvote:6
First of all, Norway is an expensive country so you should be prepared to pay expensive prices.
The cheapest is in the Jekta shopping centre, not far from the airport. The charge is 10NOK for 24 hours and are coin-operated.
The opening hours are as follows:
Monday – Friday: 10am – 9pm (10.00 – 21.00) Saturday: 10am – 6pm (10.00 – 18.00)
(Website)
Or alternatively as suggested by @gerrit you can ask your hotel/accommodation to store your luggage. From online I see that a lot of people asked for them to do so and they were more than happy to, just check the opening times.
If the Jekta shopping centre no longer has those facilities the Rica Ishavshotel has graciously allowed non guests to store their luggage there" but you may wish to check with them.
Or try the Nerstranda shopping centre for 50 NOK a day, opening hours:
Mon-Fri 9am – 8pm (09.00-20.00) Sat 10am – 6pm (10.00-18.00).
These are coin operated.
In the worst case you will have to pay 60 NOK.