By plane
The easiest, fastest and probably cheapest way to reach Troms is by air.
There are three airports in Troms:
By train
There is no railroad in Troms. The closest station is in Narvik just south of the county border. From Narvik there are buses to Harstad, Finnsnes, Tromsø and other towns in Troms. Narvik is the end station of the Swedish Malmbanan "the ore rail". Passenger trains are operated by Veolia Transport. Narvik is not connected to the main norwegian railroad network.
By car
E6 is the main route to Troms when driving from the southern parts of Norway Oslo, Trondheim. Be aware of the long distances. From Oslo to the southern border of Troms it is appr. 1400 kilometers, and to the northern border appr. 1820 kilometers.
It is also possible to drive to Troms from Finland via European Route E8 from Tornio through the Torne Valley. E10 from Kiruna and Luleå in Sweden enters Norway just north of Narvik in Nordland county. The distance from the national border to Troms county border is appr. 50 kilometers.
If you arrive during winter, be aware that winter tires are necessary and required by law. Do not try to drive without, even if you don't expect snow or ice.