USFS · California

Mount Lassic Wilderness

The Mount Lassic Wilderness, located approximately 20 miles northeast of Garberville and 8 miles west of Ruth Reservoir in Humboldt and Trinity counties, is a picturesque cluster of peaks offering impressive...

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

Official page at Wilderness Connect ↗
Mount Lassic Wilderness
Photo from Wilderness Connect, wilderness.net
DesignationWilderness
Managed byU.S. Forest Service
StateCalifornia
Size7,272 acres (Wilderness Connect)
Designated2006, by Congress
Center point40.3410, -123.5684
Night skyAbout as dark as the ground gets (Black Marble reading 10)

Boundary map

1 outline

Boundary, simplified to about 0.005 degrees Federal campground Forest Service recreation site

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 Mount Lassic Wilderness40°50°60°70°January: 8.57 inches of precipitationFebruary: 8.87 inches of precipitationMarch: 6.64 inches of precipitationApril: 4.91 inches of precipitationMay: 2.11 inches of precipitationJune: 0.73 inches of precipitationJuly: 0.09 inches of precipitationAugust: 0.09 inches of precipitationSeptember: 0.51 inches of precipitationOctober: 2.63 inches of precipitationNovember: 6.38 inches of precipitationDecember: 10.72 inches of precipitationJanFebMarAprMayJunJulAugSepOctNovDecJanuary: 43.9°F averageFebruary: 45.5°F averageMarch: 47.9°F averageApril: 51.2°F averageMay: 56.3°F averageJune: 59.5°F averageJuly: 62.8°F averageAugust: 63.2°F averageSeptember: 60.7°F averageOctober: 53.9°F averageNovember: 47.0°F averageDecember: 43.0°F average0 in5 in10 in15 inTemp °FInches
The line is the average temperature and the bars are average precipitation at Grizzly Creek Sp, 21 miles from the center point at 413 feet, station USC00043647 in the NOAA monthly climate normals for 1991 to 2020. Precipitation totals about 52 inches a year. The station sits about 4,200 feet lower than the center point, so temperatures on the ground run cooler.

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

Trailheads and sites

Forest Service directory · 1

The Forest Service lists 1 recreation site inside this wilderness, among them 1 backpacking. Each links to its page on fs.usda.gov, which carries the season, fees and current status.

Distance is from the center point of the boundary, not from a road or town.

2 named Forest Service trails enter this wilderness, 1 miles in all.

TrailMiles
MT. Lassic0.8
MT. Lassic Loop0.4

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.

Reference

Questions people ask

How big is Mount Lassic Wilderness?

7,272 acres.

Source: Wilderness Connect

Who manages Mount Lassic Wilderness?

The U.S. Forest Service.

Source: Wilderness Connect

What state is Mount Lassic Wilderness in?

California.

Source: Wilderness Connect

When was Mount Lassic Wilderness designated?

Congress designated it in 2006.

Source: Wilderness Connect

Can I camp at Mount Lassic Wilderness?

No federal campground sits inside the boundary. The nearest is Mad River Campground, 4.7 miles out. 3 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

Where are the trailheads in Mount Lassic Wilderness?

The Forest Service lists 1 recreation site here, including 1 backpacking. Each one links to its Forest Service page.

Source: Trailheads and sites

How do I get to Mount Lassic Wilderness?

A point inside the boundary is at 40.341, -123.568. The official page carries directions and the office address.

Source: Wilderness Connect

How dark is the night sky at Mount Lassic Wilderness?

NASA’s Black Marble night-lights image reads 10 on a 0 to 255 scale at the center point, about as dark as the ground gets.

Source: NASA Black Marble

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.