Fact sheet · Midwest
Isle Royale National Park
Unit code ISRO. Figures retrieved 2026-11-06. Official alerts, fees, and closures are not copied here.
- States on the system list
- Michigan
- Guide region
- Midwest. Editorial grouping of the state that contains the centroid, or the first listed state when the point is offshore.
- Anniversary-table date
- March 3, 1931
- Gross area acres
- 571,790.30
NPS fee acres: 539,281.91. Report date September 30, 2026. Gross area is not the same column as fee ownership.
- Boundary centroid
- 48.0310, -88.8067
Containing shoreline polygon: Michigan. Not an entrance.
- Recreation-visit record
- Highest monthly mean is in June, July, or August
Highest mean: August. Lowest mean: January. Mean annual total across complete years: 25,002 (10 complete years).
The monthly record
| Month | Mean | Lowest year | Highest year | Years in the mean |
|---|---|---|---|---|
| January | 16 | 0 | 47 | 10 |
| February | 25 | 0 | 67 | 10 |
| March | 30 | 0 | 87 | 10 |
| April | 59 | 0 | 128 | 10 |
| May | 1,144 | 0 | 1,689 | 10 |
| June | 4,722 | 240 | 6,362 | 10 |
| July | 7,510 | 2,160 | 8,766 | 10 |
| August | 8,157 | 2,494 | 10,251 | 10 |
| September | 3,042 | 1,404 | 3,696 | 10 |
| October | 248 | 9 | 474 | 10 |
| November | 24 | 0 | 70 | 10 |
| December | 25 | 0 | 81 | 10 |
How to use this fact sheet
This is a fact sheet. Every figure is tied to the sources under it. It is not a trail guide, a fee table, or a conditions report.
Official pages
These links were checked when the site was built. A working link is not a live feed. If a standard address did not respond, it is omitted.
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- Listing on the National Park System page
Nearest other national parks
Distances are great-circle miles between boundary centroids. They are not road distances or travel times.
- Voyageurs National Park — about 190 straight-line miles between boundary centroids.
- Indiana Dunes National Park — about 449 straight-line miles between boundary centroids.
- Cuyahoga Valley National Park — about 590 straight-line miles between boundary centroids.