States · California · Trinity County

Post Mountain, California.

A community in Trinity County, with no city government of its own. Zillow publishes no home prices for it: see Trinity County’s.

Living in Post Mountain, Trinity County, California

Post Mountain, in Trinity County, had 3,032 people in the 2020 census. Unemployment in Trinity County was 5.5% in August 2026, and the county had 0.8% fewer jobs in 2025 than the year before. The most people in Trinity County work in schools and health care, then restaurants and hotels.

People 3,032 in the 2020 census
Household income Too few homes in Post Mountain for the Census survey to measure.
Unemployment 5.5% Trinity County, August 2026; 5.5% a year before
Homes Too few homes in Post Mountain for the Census survey to measure.

What people in Trinity County work in

  • Schools, hospitals and social care23%
  • Restaurants, hotels and entertainment16%
  • Farming, forestry and mining12%
  • Shops (retail)11%
  • Building trades11%
  • Government7%

Employed residents by industry, from the Census survey. Trinity County had 2,894 jobs in 2025, 0.8% fewer than the year before (Bureau of Labor Statistics).

Weather through the year

Average daily high and low for each month: coldest in December, 48° and 34°; warmest in July, 96° and 53° 40° 60° 80° 100° J F M A M J J 96° 53° A S O N D 48° 34°
Average daily high and low for each month: coldest in December, 48° and 34°; warmest in July, 96° and 53° 40° 60° 80° 100° J F M A M J J 96° 53° A S O N D 48° 34°

Coldest in December, with highs near 48° and lows near 34°; warmest in July, with highs near 96° and lows near 53°. About 3 inches of snow and 36 inches of rain and melted snow a year.

Average daily high and low, 1991–2020, at the Big Bar East weather station, 22 miles away (NOAA).

Largest workplaces in Trinity County

  1. Trinity HospitalCritical access hospital161FTE
  2. Trinity River Lumber CompanyDimension lumber, made from logs or bolts150
  3. Trinity Alps UnifiedSchool district96FTE
  4. North State Grocery Group445110 supermarkets and other grocery retailers71
  5. Camp BasinChildren's camps60
  6. Forest ServiceFederal government · Department of Agriculture60
  7. Forest ServiceFederal government · Department of Agriculture55
  8. Mountain Valley UnifiedSchool district52FTE

Staff on average in 2025, as each workplace reported it to OSHA with its injury records: 4 workplaces with 20 or more staff, 312 people in all across the county; Post Mountain has none of its own. Hospitals come from their Medicare cost reports (CMS, 2023), school districts from the Common Core of Data (NCES, 2023–24) and federal offices from OPM's federal workforce data (2026); FTE marks full-time equivalent staff. Not listed: many offices and banks, which need not report to OSHA; military bases, whose staff OPM withholds; and, in about half the states, city and county governments.

Natural hazards

  1. LandslidesVery high
  2. WildfireVery high
  3. Inland floodingVery high
  4. EarthquakesRelatively high
  5. Heat wavesRelatively moderate
  6. LightningRelatively moderate

FEMA’s National Risk Index (December 2025) rates the risk each natural hazard poses to the people, buildings and farms in Post Mountain’s census tracts, against the rest of the country; all of them together, very high. It is meant for planning, not a substitute for a local risk assessment or a flood map: FEMA’s index.

From the U.S. Census Bureau’s 2020 census and its American Community Survey (2020–2024 five-year estimates), and the Bureau of Labor Statistics. A survey, so each figure has a margin of error, and figures it is not sure of are left out. More on Trinity County.