BLM · USFS · California

Ishi Wilderness

The Yahi Yana Indians lived in this region for over 3,000 years before white settlers arrived around 1850 and promptly exterminated all but the handful who escaped into the harsh and remote canyons of...

Description from Wilderness Connect (wilderness.net), where the full text continues.

Official page at Wilderness Connect ↗
Ishi Wilderness
Photo from Wilderness Connect, wilderness.net
DesignationWilderness
Managed byBureau of Land Management and U.S. Forest Service
StateCalifornia
Size42,079 acres (Wilderness Connect)
Designated1984, by Congress
Center point40.1105, -121.7349
Night skyAbout as dark as the ground gets (Black Marble reading 18)

Boundary map

1 outline

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 Ishi Wilderness30°40°50°60°70°January: 8.29 inches of precipitationFebruary: 8.28 inches of precipitationMarch: 7.56 inches of precipitationApril: 4.14 inches of precipitationMay: 2.76 inches of precipitationJune: 1.11 inches of precipitationJuly: 0.20 inches of precipitationAugust: 0.18 inches of precipitationSeptember: 0.51 inches of precipitationOctober: 2.67 inches of precipitationNovember: 5.16 inches of precipitationDecember: 9.23 inches of precipitationJanFebMarAprMayJunJulAugSepOctNovDecJanuary: 33.3°F averageFebruary: 34.5°F averageMarch: 37.5°F averageApril: 41.6°F averageMay: 48.7°F averageJune: 56.7°F averageJuly: 63.3°F averageAugust: 62.0°F averageSeptember: 57.4°F averageOctober: 48.0°F averageNovember: 38.6°F averageDecember: 33.1°F average0 in2 in4 in6 in8 in10 inTemp °FInches
The line is the average temperature and the bars are average precipitation at Mineral, 18 miles from the center point at 4,875 feet, station USC00045679 in the NOAA monthly climate normals for 1991 to 2020. Precipitation totals about 50 inches a year.

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 sits inside the boundary. 2 are within ten miles of it. Nearest first. Distances are from the campground point to the boundary edge, from the Campsite Atlas index.

11 named Forest Service trails enter this wilderness, 49 miles in all. The 10 longest are listed here.

TrailMiles
Mill Creek19.5
Deer Creek Ishi5.5
Grahams Pinery/Devils Den Ishi4
Moak3.7
Lassen Trail Ishi3.4
Buena Vista Trail Ishi3
Boat Gunwale Tie Ishi2.4
Rancheria Trail Ishi2.4
Table Mountain Ishi2.1
Deep Hole Tie Ishi1.9

Lengths and allowed uses come from the Forest Service trail layer by way of Trailhead Atlas, refreshed September 18, 2026. Trails in plain text have no page there yet.

Explore

Nearby on the other atlases

National Park System units within 30 miles · Park Atlas
National Register listings within 15 miles · 3 in all · Register Atlas

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

Reference

Questions people ask

How big is Ishi Wilderness?

42,079 acres.

Source: Wilderness Connect

Who manages Ishi Wilderness?

Bureau of Land Management and U.S. Forest Service share management. The Bureau of Land Management portion is the largest in the wilderness record.

Source: Wilderness Connect

What state is Ishi Wilderness in?

California.

Source: Wilderness Connect

When was Ishi Wilderness designated?

Congress designated it in 1984.

Source: Wilderness Connect

Can I camp at Ishi Wilderness?

No federal campground sits inside the boundary. The nearest is Mill Creek Campground, 7.7 miles out. 2 in all are within ten miles. Camping inside a wilderness is usually allowed away from roads, with no facilities; the managing agency page has the permit rules.

Source: Where to camp

How do I get to Ishi Wilderness?

A point inside the boundary is at 40.111, -121.735. Lassen Volcanic National Park is 26 miles away. The official page carries directions and the office address.

Source: Wilderness Connect

How dark is the night sky at Ishi Wilderness?

NASA’s Black Marble night-lights image reads 18 on a 0 to 255 scale at the center point, about as dark as the ground gets.

Source: NASA Black Marble

Which national parks are near Ishi Wilderness?

Lassen Volcanic National Park (26 mi). Park Atlas has fees, hours and alerts for each.

Source: Nearby on the other atlases

Are there historic places near Ishi Wilderness?

3 National Register listings within 15 miles, including Inskip Hotel and Park Headquarters, Lassen Volcanic National Park.

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.
  • Trails: the Trailhead Atlas open-data file of Forest Service trails, matched on the wilderness each trail enters.
  • 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.