California Ground Squirrel

Otospermophilus beecheyi

LCLeast Concern

California ground squirrels are bold, social burrowers familiar on western hillsides, road cuts, and farm edges. Their mottled backs and pale shoulder patches break up the outline of an animal watching from upright posture. Reports are concentrated in California, with established populations reaching Nevada and Oregon, and they show how readily this squirrel uses both natural grassland and heavily altered ground.

Range through the year

Where California Ground Squirrel is seen

California Ground Squirrel is recorded in 4 US states from 45,168 occurrence records, most heavily in California (44,512 records) and Nevada (638).

Current range45,168 records · 4 states
AlabamaArizonaArkansasCalifornia · 44,512 records · view state pageColoradoConnecticutDelawareDistrict of ColumbiaFloridaGeorgiaIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevada · 638 records · view state pageNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregon · 10 records · view state pagePennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashington · 8 records · view state pageWest VirginiaWisconsinWyomingAlaskaAKHawaiiHIPuerto RicoPR
Occurrence data by state and month
California Ground Squirrel – occurrence records by US state and month (45,168 total across 4 states)
StateJanFebMarAprMayJunJulAugSepOctNovDecYear
California2,6473,6394,8265,9935,7364,8043,9323,2463,2602,4892,1551,78544,512
Nevada9294469931121006848341913638
Oregon·1··132·2··110
Washington····1·3211··8

Based on 58,236 georeferenced US records, 2000-2026. Shading is observation density (where people record sightings), not true abundance. Alaska, Hawaii & Puerto Rico shown as insets.

Explore by state

California Ground Squirrel across 4 states

Occurrence records, conservation status, and the places it turns up, state by state. Open a state for detail, or visit its full page.

  • CaliforniaNativeCommon57,182 records

    State rankUnranked

    Notable placesYosemite National Park · Santa Monica Mountains National Recreation Area · Torrey Pines State Reserve · San Bernardino National Forest

    Countiesrecorded in 12

    Year-round in California, with recorded sightings peaking in March–June.

  • NevadaNativeCommon831 records

    State rankSecure

    Notable placesToiyabe National Forest · Fort Churchill State Historic Park · Mason Valley Wildlife Management Area · Dayton State Park

    Countiesrecorded in 7

    Year-round in Nevada, with recorded sightings peaking in April–August.

  • OregonNativeOccasional158 records

    Notable placesMt. Hood National Forest · Oregon Islands National Wildlife Refuge Wilderness Area · Siuslaw National Forest

    Countiesrecorded in 12

    Year-round in Oregon, with recorded sightings peaking in June–August, with a smaller rise in October.

  • WashingtonNativeOccasional65 records

    Notable placesGifford Pinchot National Forest · Klickitat Wildlife Area Complex · Klickitat Trail · Oak Creek Wildlife Area Complex

    Countiesrecorded in 6

    Year-round in Washington, with recorded sightings peaking in July–August.

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.

SizeCalifornia Ground Squirrel beside a 1.8 m adult, drawn to scale
Created by potrace 1.16, written by Peter Selinger 2001-2019 Created by potrace 1.16, written by Peter Selinger 2001-2019
Body length
30–30 cm12 in–12 in
Weight
280–738 g0.6–2 lb

Silhouettes drawn to scale against a 1.8 m5 ft 11 in adult.

Elevation

From 200 georeferenced records, the California Ground Squirrel is recorded from sea levelsea level to 1,894 m6,214 ft, with half of sightings below 44 m144 ft.

Each band shows the share of georeferenced sightings that fall within it. Records cluster where people live and hike, so low, populated elevations are over-represented. Read this as observation density, not true abundance.

Observation peakApril40,922 records

Seasonality from research-grade observation dates across the US (40,922 records, all years). Reflects when the species is recorded, not a guarantee of presence.

Daily activity clockDiurnal– most active during daylight hours

1,395 california ground squirrel observations logged by hour of day. Activity is diurnal (most active during daylight hours), peaking around 12 PM.

12 AM: 3 observations1 AM: 2 observations2 AM: 4 observations3 AM: 2 observations4 AM: 3 observations5 AM: 5 observations6 AM: 8 observations7 AM: 36 observations8 AM: 82 observations9 AM: 128 observations10 AM: 129 observations11 AM: 142 observations12 PM: 161 observations1 PM: 109 observations2 PM: 126 observations3 PM: 136 observations4 PM: 108 observations5 PM: 101 observations6 PM: 77 observations7 PM: 15 observations8 PM: 9 observations9 PM: 4 observations10 PM: 4 observations11 PM: 1 observations12 AM6 AM12 PM6 PM

Based on 1,395 records (all years). Reflects when people record sightings, not only when the animal is active.

Hourly observation counts: 12 AM 3, 1 AM 2, 2 AM 4, 3 AM 2, 4 AM 3, 5 AM 5, 6 AM 8, 7 AM 36, 8 AM 82, 9 AM 128, 10 AM 129, 11 AM 142, 12 PM 161, 1 PM 109, 2 PM 126, 3 PM 136, 4 PM 108, 5 PM 101, 6 PM 77, 7 PM 15, 8 PM 9, 9 PM 4, 10 PM 4, 11 PM 1.

Sounds & calls

Hear the California Ground Squirrel: 2 field recordings. Press play to listen.

Best encounter

Where and when to see a California Ground Squirrel

Your best chance: California, in April, during the day.

Where
CaliforniaCA
When
April
Time
During the daydiurnal
Trophic relationshipsFood web What a California Ground Squirrel eats, and what eats it.
Eaten by6
Red-tailed HawkButeo jamaicensisGreat Blue HeronArdea herodiasCoyoteCanis latransGolden EagleAquila chrysaetosFisherPekania pennantiBobcatLynx rufus
This speciesCalifornia Ground Squirrel
Botta's Pocket GopherMegascapheus bottaeCalifornia Red-legged FrogRana draytoniiWestern ToadAnaxyrus boreasCalifornia NewtTaricha torosaRough CockleburXanthium strumariumCalifornia voleMicrotus californicusRed Sand-verbenaAbronia maritimaDesert Spiny LizardSceloporus magister magister
Eats8

A sample of documented feeding relationships, filtered to species that also occur in the US. Diet and predators vary by region and season, and this is not a complete list, many animals eat, and are eaten by, more than what has been formally recorded here.

Life history

The California Ground Squirrel (280–738 g0.6–1.6 lb) is an omnivore that first breeds around 1 years, carries a 29-day gestation, and bears about 6.7 young per litter. Maximum recorded longevity is 5.4 years.

Life cycle

  1. Gestation29 days
  2. Birthlitter of 6.7 young
  3. Sexual maturity1 yr (female)
  4. Maximum recorded longevity5.4 years

Reproduction

Gestation
29days
Litter size
6.7youngaverage
Litters / year
1litter
Age at first breeding
1years

Diet composition

Omnivore

By foraging composition: 40% plant material, 40% seeds & grain, 20% invertebrates.

  • Plant material40%
  • Seeds & grain40%
  • Invertebrates20%

Most active during the day.

Typical values for the species, not local measurements. Maximum longevity is the longest lifespan on record; most individuals live far less.

Commonly confused with

Animals people sometimes mistake for the california ground squirrel, and how to tell them apart.

The squirrel beside the burrow mouth

This is a sturdy ground squirrel with a mottled gray-brown back, a bushy but narrow tail, and a lighter patch around the shoulders. It often pauses upright near a burrow entrance. Unlike a tree squirrel, it usually escapes underground. Several animals may share a burrow system, though their social relationships aren’t simply one large family.

California ground squirrel standing on gravelly dirt with a mottled cream-and-brown speckled back
The mottled speckled coat and narrow tail separate this species from the bushier-tailed tree squirrels that share its range. Photo: Riju, CC BY 4.0.

From oak country to developed edges

Open grassland, oak woodland, rocky slopes, levees, and disturbed ground all provide usable habitat. California holds the overwhelming share of modern records, while Nevada and Oregon mark the inland and northern edge. High reporting near towns and roads partly reflects observer access. It doesn’t prove those sites support the largest populations.

California ground squirrel sitting upright on rocky sand with its long banded tail curling behind it
Rocky slopes and levee edges give the species both a lookout point and quick access to a burrow. Photo: markhl, CC0.

Seeds, green plants, and watchful feeding

The squirrels eat seeds, fruits, bulbs, green shoots, and some animal food. They forage by day and retreat when heat or danger rises. Alarm calls warn nearby squirrels of coyotes, hawks, rattlesnakes, and people. Females raise young underground, where a stable chamber protects the litter during its most vulnerable weeks.

A complicated neighbor

Burrowing can damage banks, gardens, and fields, while the animals also move soil and support many predators. Their abandoned tunnels shelter other wildlife. California ground squirrels aren’t threatened across their broad core range. Local control can still reshape colonies, especially where development leaves only narrow strips of open ground.

California ground squirrel resting its chin on a boulder with both forepaws draped over the rock edge
A quiet moment on a rock pile near a burrow system, the kind of watchful rest that alternates with foraging trips. Photo: Devin Kellar, CC BY 4.0.

Data & sources

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