Summer is the best time for a Norway hiking holiday.
In the summertime, you get the warmest weather and longest daylight hours (including the possibility of experiencing the midnight sun). Also, most trails are snow-free, and most tourist facilities will be open.
However, summer is also the most crowded time to visit Norway (if you’re not heading for the hidden gem hikes) the prices are higher, and mosquitoes can be a nuisance.
The shoulder seasons offer pleasant temperatures, fewer crowds, and beautiful fall foliage in September. However, some higher-altitude trails will be inaccessible due to the weather conditions, and many tourist facilities will be closed.
Winter (December through March) can be a beautiful time in Norway if you enjoy wintery landscapes. There are much fewer people on the trails, and there’s a greater chance of catching the Northern Lights.
However, the weather can get extremely cold, many trails are inaccessible due to snow, and you have limited daylight hours to enjoy your hike.