California mammals

San Diego Pocket Mouse in California

Chaetodipus fallax

Native to California SNR Unranked in California

Not listed as nonindigenous in California by USGS NAS; native to its California range.

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

LC – Least Concern

Widespread and abundant; not at risk.

San Diego Pocket Mouse in California, by the numbers

Occasional in California 113th most recorded of 241 mammals logged in California

1,956 occurrence records
99 with iNaturalist photos

Records from 2000–2026.

1,956 total records count every California occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 1,945 records with a full observation date.

When to look for the San Diego Pocket Mouse in California

Most sightings fall in September to October.

1,945 California occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly California records (table)
MonthRecords
January124
February63
March119
April177
May161
June93
July173
August139
September336
October291
November133
December136

Monthly san diego pocket mouse occurrence records (iNaturalist and GBIF) in California, 2000–2026.

Seasonality

Year-round in California, with recorded sightings peaking in September–October.

Occurrence map

Where San Diego Pocket Mouse has been recorded in California

300 records mapped · zoom and drag to explore

299 California records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Joshua Tree National Park 122
Santa Rosa And San Jacinto National Monument 61
San Gabriel Mountains National Monument 10
San Felipe Valley Wildlife Area 8
Border Field State Park 8
Cabrillo National Monument 7
Unnamed site - Coachella Valley Mountains Conservancy 5
Torrey Pines State Reserve 3

Protected places with the most san diego pocket mouse sightings, from the USGS Protected Areas Database plus named mountain ranges, good spots to look, not a full breakdown, so they don't sum to the total.

Where it's recorded in California

CountyRecords
San Diego County 738
Riverside County 604
San Bernardino County 422
Imperial County 118
Los Angeles County 37
Orange County 21
Humboldt County 4
Marin County 1
San Joaquin County 1
Other localities 10

The complete county distribution, spread across 9 California counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

San Diego pocket mouse reports come from southern California’s dry coastal scrub, rocky slopes, and desert edges. The Salton Sea region captures the inland part of that story, whereas the Klamath Basin and San Francisco Bay lie far outside the most useful geographic frame for this animal.

September and October stand well above the other months, with April and July forming smaller rises. Reports nevertheless span the calendar. Because this mouse is nocturnal and often found through targeted trapping, changes in survey dates can outweigh changes in visibility to casual observers.

Occurrence data from iNaturalist and GBIF.

More mammals in California in the atlas

Data & sources

The data and visualizations on this page draw on these open sources:

  • GBIFCC-BY 4.0occurrence records behind the range map, elevation, and record counts
  • iNaturalistCC0 / CC-BY / CC-BY-SAobservations, photos, and audio recordings
  • NatureServe ExplorerCC-BYthe state conservation rank
  • IUCN Red Listattributed factthe global conservation status
  • USGS NASpublic domainnative / introduced status
  • Natural Earthpublic domainthe relief basemap
  • USFSpublic domainnational-forest boundaries
  • USGS Protected Areas Databasepublic domainthe named parks, forests, and refuges behind "notable places to look"