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When Isle Royale is busiest and quietest
Isle Royale draws about 26,000 recreation visits in a typical year. August is the peak, with 33.5% of the year's visits. May is the quietest month that still draws a normal share, at 4.7%.
AugustBusiest month
MayQuietest open month
7.1xPeak month visits vs the quietest open month
8,738Visits in a typical August
Share of the year's visits, by month
BusiestQuietest open monthOther months
Low months are not always the best months. January, February, March, April, October, November and December each draw under 4% of the year's visits. That usually reflects snow, closed roads or reduced services, so check the park's own conditions page before planning around them. The quietest month overall is January.
Typical visits per month
| Month | Typical visits | Share of year |
|---|---|---|
| January | 13 | 0.1% |
| February | 25 | 0.1% |
| March | 33 | 0.1% |
| April | 70 | 0.3% |
| May | 1,243 | 4.7% |
| June | 5,005 | 19.0% |
| July | 7,741 | 29.4% |
| August | 8,738 | 33.5% |
| September | 3,068 | 11.6% |
| October | 262 | 1.0% |
| November | 32 | 0.1% |
| December | 33 | 0.1% |
How this was worked out
We averaged 9 years of National Park Service recreation visitor counts (2015 to 2025, leaving out 2020 and 2021). Each month is shown as its share of that year's total, then averaged. The counts are monthly, so this cannot tell you about holiday weekends or a specific week. It is history, not a forecast. Full details are on the methodology page.