Accessibility: all year
We only experience the border triangle between, Norway, Sweden and Finland in winter. In Winter it is more easy to get there, if you go by snow scooter. Also our camper guests did this tour and wrote a small review in our blog. You will find the blog entry here. Of course it is nothing special to see, just a big rock monument. But the surrounding is absolute amazing and going there with the snow scooter will give you a blast. If you want to rent a snow scooter, Juusi from Kilpissafarit will help you out. It takes you about an hour from the scooter rental station to go there. You can rent a snow scooter in Finland without any driver license.
We do not have any experience to approached the Nordic border triangle in summer.