There are many places one can go cross-country skiing in Østfold, but these are my favourites.
- Fredrikstad Marka: A popular spot within easy reach of Fredrikstad. It can get a little bit crowded at times near Skihytta (the place to go for coffee and a waffle after your foray into the woods), but you’ll find a good choice of tracks in a varied terrain.
- Rakkestadfjella: Fewer people come here, which means you might ski for hours on end and only meet a handful of locals. Pack a picnic, and make it a day outing. Great scenery, and who knows, with a bit of luck you might even spot some wildlife.
- Harehjellhytta: This is a good choice in the Sarpsborg area, with the possibility of going skiing after dark as some of the tracks are lit up at night. Artificial snow is used when required, and the tracks are in good condition.
- Halden: There are many tracks to choose from in Høiåsmarka just outside Halden. Høiåshytta, which lies 236m over sea level, is open Thursdays 1700-2030 and Sundays 1000-1500 from September to Easter.
Check also http://www.elusivemoose.eu/2009/12/where-to-go-alpine-skiing-in-østfold/ for info on where to go downhill skiing in Østfold.