Best Times to Visit Acadia National Park
The best time to visit Acadia National Park is September through early October, after the summer crowds have left but before the temperatures drop below freezing. Visiting in March, April, and May can be soggy—fog and rain are common—so you'll need to pack your waterproof gear. The weather is pleasant come July and August, but it's by far the most crowded season for the park. The park is near abandoned in winter but it's the perfect time to visit for the dedicated adventure traveler ready to brave the freezing temperatures.
Even though the snow has melted, the early spring is still considered the off-season. Most park facilities operate limited hours until mid April, if they're open at all. But the crowds are thin and as long as you don't mind foggy mornings, mud and temperatures that range from the mid 20s to mid 50s, a springtime visit can be worthwhile.
With moderate temperatures ranging from the 50s to the 80s, summers are pleasant times to visit, so naturally there's a tourist influx. Keep in mind that Park Loop Road can get congested pretty easily and last minute accommodations are hard to find. Do yourself a favor and book your campground the previous winter. And be sure to pack your sweater, as Canadian Arctic winds keep even the summer nights chilly.
The summer crowds disperse as the high average temperatures drop to the chilly 40s and 50s, but the lack of crowds make a fall visit even more enjoyable. The prime time is in October when leaf-peeping season begins; the colors make the picturesque vistas that much more dramatic. But fair warning: some off park businesses in Bar Harbor close up shop for the off-season after the Columbus Day weekend.
Acadia's below-freezing winters are not for everyone. Dining and lodging can be hard to come by as most restaurants and mid-range hotels in Bar Harbor are closed for the off-season. Beginning in December, the park also switches over to its winter hours, closing down major hiking trails and sections of the Park Loop Road. But if you're a winter sports enthusiast, you're in for a treat; the carriage roads are still kept open for some of the most picturesque cross-country skiing in the country.