USFWS · Washington

San Juan Wilderness

The tips of submerged mountains collectively thrust above the sea where two straits–Georgia and Juan de Fuca–meet up with Puget Sound, forming the San Juan Islands. Of the 700 or so islands, islets, rocks, and reefs that make up the San Juan Islands, fewer than 200 have garnered official names. The large islands of San Juan, Lopez, Orcas, and Shaw make up more than 80 percent of the landmass. Of the rest of the land, much of it wave-drenched, 83 pieces are included in the San Juan Islands National Wildlife Refuge, a sanctuary for gulls, cormorants, guillemots, puffins, brants, oystercatchers, auklets, bald eagles, and harbor seals.

Description from Wilderness Connect (wilderness.net).

Official page at Wilderness Connect ↗
San Juan Wilderness
Photo from Wilderness Connect, wilderness.net
DesignationWilderness
Managed byU.S. Fish and Wildlife Service
StateWashington
Size353 acres
Designated1976, by Congress
Center point48.75° N, 122.84° W
Night skyAbout as dark as the ground gets (Black Marble reading 6)

Boundary map

9 outlines

Boundary, simplified to about 0.005 degrees

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 San Juan Wilderness40°50°60°70°January: 3.95 inches of precipitation, 1.8 inches of snowFebruary: 2.60 inches of precipitation, 0.4 inches of snowMarch: 2.63 inches of precipitation, 0.1 inches of snowApril: 2.07 inches of precipitation, 0.0 inches of snowMay: 1.68 inches of precipitation, 0.0 inches of snowJune: 1.27 inches of precipitation, 0.0 inches of snowJuly: 0.71 inches of precipitation, 0.0 inches of snowAugust: 1.00 inches of precipitation, 0.0 inches of snowSeptember: 1.62 inches of precipitation, 0.0 inches of snowOctober: 3.24 inches of precipitation, 0.1 inches of snowNovember: 4.58 inches of precipitation, 0.6 inches of snowDecember: 3.83 inches of precipitation, 2.8 inches of snowJanFebMarAprMayJunJulAugSepOctNovDecJanuary: 41.0°F averageFebruary: 42.5°F averageMarch: 45.5°F averageApril: 49.7°F averageMay: 54.5°F averageJune: 58.1°F averageJuly: 61.7°F averageAugust: 61.7°F averageSeptember: 58.2°F averageOctober: 51.6°F averageNovember: 45.0°F averageDecember: 40.6°F average0 in1 in2 in3 in4 in5 inTemp °FInches
The line is the average temperature and the bars are average precipitation at Olga 2 SE, 9 miles from the center point at 80 feet, station USC00456096 in the NOAA monthly climate normals for 1991 to 2020. Precipitation totals about 29 inches a year. The dotted line is average snowfall, about 6 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 →

No federal campground is within ten miles of the boundary in the Campsite Atlas index. Camping inside a wilderness is usually allowed away from trails and water, with no facilities; the managing agency page has the permit and group-size rules.

Explore

Nearby on the other atlases

National Register listings within 15 miles · 60 in all · Register Atlas

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

Guidebooks for San Juan Wilderness and Washington

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

  • Hiking Colorado's Weminuche and South San Juan Wilderness Areas
    Donna Ikenberry, 2014
    Find at Bookshop.org
  • Backpacking Washington
    Douglas Lorain, 2020
    Find at Bookshop.org
  • Pacific Crest Trail: Oregon and Washington
    Andy Selters, 2019
    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 San Juan Wilderness?

353 acres.

Source: Wilderness Connect

Who manages San Juan Wilderness?

The U.S. Fish and Wildlife Service.

Source: Wilderness Connect

What state is San Juan Wilderness in?

Washington.

Source: Wilderness Connect

When was San Juan Wilderness designated?

Congress designated it in 1976.

Source: Wilderness Connect

How do I get to San Juan Wilderness?

A point inside the boundary is at 48.746° N, 122.838° W. San Juan Island National Historical Park is 3 miles away. The official page carries directions and the office address.

Source: Wilderness Connect

Which national parks are near San Juan Wilderness?

San Juan Island National Historical Park (3 mi) and Ebey's Landing National Historical Reserve (19 mi). Park Atlas has fees, hours and alerts for each.

Source: Nearby on the other atlases

Are there historic places near San Juan Wilderness?

The National Register has 60 listings within 15 miles, including W. T. Preston (snagboat) and Center School.

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.