NPS · Michigan

Isle Royale Wilderness

The Ojibwe who have visited the island for more than 4,500 years called Isle Royale "Minong", the good place. French trappers gave the 45-mile-long, nine-mile-wide Isle Royale its regal name. Located in the northern, surging waters of Lake Superior, 99% of Isle Royale National Park has been designated Wilderness. The largest island in the largest freshwater lake in North America, it is also by far the state's largest Wilderness area. Created by flowing lava, flattened and smoothed by glaciation and subsequent erosion, the island contains more than 100 lakes and small ponds; in fact, water covers more of the surface than dry land when you include the waters of Lake Superior where the park boundary extends 4.5 miles out.

Description from Wilderness Connect (wilderness.net).

Official page at Wilderness Connect ↗
Isle Royale Wilderness
Photo from Wilderness Connect, wilderness.net
DesignationWilderness
Managed byNational Park Service
StateMichigan
Size132,018 acres
Designated1976, by Congress
Center point47.99° N, 88.89° W
Night skyAbout as dark as the ground gets (Black Marble reading 9)

Boundary map

4 outlines

Boundary, simplified to about 0.005 degrees Federal campground

The outline is the agency boundary simplified for display, so small parcels and inholdings may not show. The agency page has the authoritative map.

Weather by month

NOAA climate normals →
Weather by month near Isle Royale Wilderness10°20°30°40°50°60°70°January: 1.35 inches of precipitation, 12.2 inches of snowFebruary: 1.03 inches of precipitation, 8.0 inches of snowMarch: 1.33 inches of precipitation, 8.0 inches of snowApril: 2.79 inches of precipitation, 7.7 inches of snowMay: 3.11 inches of precipitation, 0.2 inches of snowJune: 3.58 inches of precipitation, 0.0 inches of snowJuly: 3.42 inches of precipitation, 0.0 inches of snowAugust: 3.04 inches of precipitation, 0.0 inches of snowSeptember: 3.13 inches of precipitation, 0.0 inches of snowOctober: 3.40 inches of precipitation, 0.5 inches of snowNovember: 2.65 inches of precipitation, 6.7 inches of snowDecember: 1.74 inches of precipitation, 11.9 inches of snowJanFebMarAprMayJunJulAugSepOctNovDecJanuary: 10.5°F averageFebruary: 13.1°F averageMarch: 23.7°F averageApril: 35.8°F averageMay: 47.4°F averageJune: 56.9°F averageJuly: 63.0°F averageAugust: 62.6°F averageSeptember: 54.4°F averageOctober: 42.4°F averageNovember: 29.6°F averageDecember: 17.5°F average0 in5 in10 in15 inTemp °FInches
The line is the average temperature and the bars are average precipitation at Grand Portage, 37 miles from the center point at 730 feet, station USC00213296 in the NOAA monthly climate normals for 1991 to 2020. Precipitation totals about 31 inches a year. The dotted line is average snowfall, about 55 inches a year on the same inches scale.

Large units span more than one climate. The station stands in for the center point, and the outer parts of the boundary can be warmer or colder.

Where to camp

Campsite Atlas →

20 federal campgrounds sit inside the boundary and 16 more are within ten miles of it. Nearest first. Distances are from the campground point to the boundary edge, from the Campsite Atlas index.

Show 4 more

24 more within ten miles are not listed here.

Explore

Nearby on the other atlases

National Register listings within 15 miles · 8 in all · Register Atlas

Landmarks are listed first, then by distance from the boundary.

Guidebooks for Michigan

We earn a small commission if you buy through these links. It does not change what we list.

  • Rail-trails Michigan & Wisconsin
    Rails-to-Trails Conservancy, 2017
    Find at Bookshop.org
  • Explorer's Guide 50 Hikes on and Around the North Country Trail - Michigan and Wisconsin
    Thomas Funke, 2016
    Find at Bookshop.org
  • Hiking Michigan's Upper Peninsula
    Eric Hansen, 2016
    Find at Bookshop.org
  • Five-Star Trails: Ann Arbor and Detroit
    Greg Tasker, 2018
    Find at Bookshop.org

Titles come from Open Library's catalog, matched by subject heading or by title.

Reference

Questions people ask

How big is Isle Royale Wilderness?

132,018 acres.

Source: Wilderness Connect

Who manages Isle Royale Wilderness?

The National Park Service.

Source: Wilderness Connect

What state is Isle Royale Wilderness in?

Michigan.

Source: Wilderness Connect

When was Isle Royale Wilderness designated?

Congress designated it in 1976.

Source: Wilderness Connect

Can I camp at Isle Royale Wilderness?

Camping inside a wilderness is usually allowed away from roads, with no facilities, and the managing agency page has the permit rules. The federal campgrounds within ten miles are listed under Where to camp.

Source: Where to camp

How do I get to Isle Royale Wilderness?

A point inside the boundary is at 47.987° N, 88.888° W. Isle Royale National Park is adjacent. The official page carries directions and the office address.

Source: Wilderness Connect

Which national parks are near Isle Royale Wilderness?

Isle Royale National Park (adjacent) and Grand Portage National Monument (24 mi). Park Atlas has fees, hours and alerts for each.

Source: Nearby on the other atlases

Are there historic places near Isle Royale Wilderness?

The National Register has 8 listings within 15 miles, including Ishpeming Fire Tower and New Feldtmann Fire Tower.

Source: Register Atlas

Sources

  • Boundary, name, acreage, designation year, states and description: Wilderness Connect.
  • Campgrounds: the Campsite Atlas index of federal campgrounds, matched to this boundary at build time.
  • Trailheads and sites: the Forest Service Recreation Opportunities layer, points inside the boundary.
  • Night sky: NASA Black Marble (VIIRS, 2016 composite) sampled at zoom 6 around the center point.
  • Weather, alerts, air quality, river flow and earthquakes load live in your browser from NWS, AirNow, USGS and iNaturalist when you open the page.