Thursday 01 Jan New Year's Day
Thursday 02 Apr Maundy Thursday
Friday 03 Apr Good Friday
Sunday 05 Apr Easter Day
Monday 06 Apr Easter Monday
Friday 01 May Official holiday
Thursday 14 May Ascension Day
Sunday 17 May 17 May Constitution Day (1814)
Sunday 24 May Whit Sunday
Monday 25 May Whit Monday
Friday 25 Dec Christmas Day
Saturday 26 Dec Boxing Day
Source: https://www.timeanddate.com/holidays/norway/2015#!hol=9