WHEN TO HIKE LAUGAVEGUR?Due to the unpredictable weather in the region, the Laugavegur trail is only open from late June to mid September. The exact dates are dependent on the weather, and also on Iceland’s Road Authority. The trailhead, and some of the huts along the route, are accessed by gravel F-roads (roads that access the highlands of Iceland), which are closed during the winter months when conditions are too dangerous for driving.
Source: https://www.muchbetteradventures.com/magazine/a-guide-to-walking-the-laugavegur-trail/
I walked it in July and still had to hike over a short ice field at one point. In winter you would need crampons as it’s hilly. As you can see from the photos in the link it’s a very remote location, you don’t pass through villages or have proper roads there. There are a few huts at the campsites and nothing else.
I also hiked it with a group as part of a charity hike so we didn’t have to carry our own tents or food. Our 4WD support vehicle took them from camp to camp and set up the dining tent and cooked for us like a cold, wet (lots of rain) version of Out of Africa! We did carry our clothes, water and snacks for the day and had to put our sleeping tents up on arrival at camp. For a sick man to do that hike in winter with no back up so carrying warm clothes, tent, several days food etc? No way that happened. There is one point you have to go down a steep slope clinging to a rope and there were several river crossings where we had to take your boots off and on one we had to link arms to be sure the current wouldn’t knock us over into the freezing cold water which was glacial run off. Obviously the glaciers wouldn’t be melting in winter but that walk would be seriously dangerous in winter. Which is why it’s only open three months a year.
Also in July we seemed to have near constant daylight. I never saw it be dark although there may have been a couple of hours during the night. So in winter it would be very very short days. You couldn’t walk around there in darkness!