When to Go
Although shivering, wind-flattened visitors braving Orkney and Shetland's winter are not unheard of, the travel season doesn't really start until May, and it runs until September. June is one of the most popular months for both islands. The bird colonies are at their liveliest in early summer, which is also when the long northern daylight hours allow you plenty of sightseeing time. Shetland's northerly position means that it has only four or five hours of darkness around the summer solstice, and on a clear night it doesn't seem to get dark at all. Beware the changeable weather even in summer: it could be 75°F one day and then hail the next. Many sights close in September, and by October wilder gales will be mixed with snow flurries one minute and glorious sunshine the next. If you are determined to brave the elements, take into account that there are only six hours of daylight in winter months.
Shetland's festival of fire, Up-Helly-Aa, is held the last Tuesday of each January. The spectacle of Lerwick overrun by Vikings, with torches aflame and a huge Viking longship, is wildly popular. Book at least a year in advance if you want to get a bed for the night.