In short
- June through August are the peak months for kayaking and boat tours.
- May and June water temperatures remain in the 40s Fahrenheit.
- Winter ice caves rarely open, occurring on just 2% of days since 2000.
In this article
Lake Superior weather changes rapidly and controls park access. Summer provides calm waters for paddling to the Meyers Beach sea caves. Winter brings harsh conditions and extremely rare access to the frozen caves.
When is the best time to kayak the Apostle Islands?
June through August are the best months for kayaking the sea caves.
Summer offers the calmest waters and most predictable marine weather. Even in summer, you must use a 16-foot sea kayak with sealed bulkheads. Sudden squalls can occur, making the sea caves hazardous in rough seas.
How cold is the water in spring and early summer?
Average water temperatures in May and June remain in the 40s (Fahrenheit).
Paddling during these months requires a wetsuit or drysuit. The cold water creates dangerous conditions if you capsize. Many visitors prefer taking the Apostle Islands Cruise Service from Bayfield during this colder period.
How often do the winter ice caves open?
The mainland ice caves are extremely rare.
Between 2000 and 2023, historical access to the mainland ice caves occurred on only 2% of days. The caves only open when Lake Superior freezes solid enough for safe walking. When they do open, you cannot park directly at the Meyers Beach trailhead. Visitors must take off-site shuttles.
When does the park stay open?
Apostle Islands National Lakeshore is open year-round.
While the Bayfield headquarters and the mainland trails remain open all year, water access stops in late fall. Strong winds and rough seas make kayaking unsafe outside the summer window.
Apostle Islands accessibility by season
Access depends heavily on the month and Lake Superior's marine forecast.
Review typical conditions before you plan your drive to Bayfield or Meyers Beach.
Questions travellers ask
When is the best time to see the Apostle Islands sea caves?
June through August are the best months. You can see the sea caves via kayak, the 3-hour Grand Tour boat cruise, or by hiking the Lakeshore Trail above the caves.
Are the Apostle Islands ice caves open right now?
Winter ice cave access is extremely rare. Safe ice conditions occurred on only 2% of days between 2000 and 2023. You must check official park updates before traveling.
Is it safe to kayak the Apostle Islands in May?
Lake Superior water temperatures remain in the 40s (Fahrenheit) in May. You need a 16-foot sea kayak, a wetsuit or drysuit, and marine weather monitoring gear to stay safe.
