Uinta Ground Squirrel

Urocitellus armatus

Also known as: Uinita Ground Squirrel

LCLeast Concern

Uinta ground squirrels are social, blunt-faced squirrels of the northern Utah and Greater Yellowstone high country. Their defining trick is compression: feeding, breeding, and raising young fit into a short season between emergence and a long underground dormancy. Records from Utah, Wyoming, Idaho, and Montana reveal that tight western range and its strong spring-to-summer pulse, but report totals reflect visibility and observer effort, not population size.

Range through the year

Where Uinta Ground Squirrel is seen

Uinta Ground Squirrel is recorded in 4 US states from 2,801 occurrence records, most heavily in Wyoming (1,552 records) and Utah (999).

Current range2,801 records · 4 states
AlabamaArizonaArkansasCaliforniaColoradoConnecticutDelawareDistrict of ColumbiaFloridaGeorgiaIdaho · 180 records · view state pageIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontana · 70 records · view state pageNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtah · 999 records · view state pageVermontVirginiaWashingtonWest VirginiaWisconsinWyoming · 1,552 records · view state pageAlaskaAKHawaiiHIPuerto RicoPR
Occurrence data by state and month
Uinta Ground Squirrel – occurrence records by US state and month (2,801 total across 4 states)
StateJanFebMarAprMayJunJulAugSepOctNovDecYear
Wyoming1·16431649851215232211,552
Utah··947164320283160142··999
Idaho··21362256368·1··180
Montana···81224188····70

Based on 5,276 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

Uinta 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.

  • WyomingNativeCommon2,577 records

    State rankVulnerable

    Notable placesYellowstone National Park · Grand Teton National Park · Teton National Forest · Bridger Wilderness

    Countiesrecorded in 9

    Year-round in Wyoming, with recorded sightings peaking in June–July.

  • UtahNativeCommon2,124 records

    State rankSecure

    Notable placesWasatch National Forest · Henefer - Echo State Wildlife Area · Uinta National Forest · Cache National Forest

    Countiesrecorded in 12

    Year-round in Utah, with recorded sightings peaking in May–July.

  • IdahoNativeCommon390 records

    State rankApparently Secure

    Notable placesHenrys Lake State Park · City of Rocks National Reserve · Sawtooth National Recreation Area · Rainey Bridge Access Site

    Countiesrecorded in 12

    Year-round in Idaho, with recorded sightings peaking in June–July.

  • MontanaNativeOccasional185 records

    State rankUnrankable

    Notable placesBeaverhead National Forest · Gallatin National Forest · Yellowstone National Park · Absaroka-Beartooth Wilderness

    Countiesrecorded in 8

    Year-round in Montana, with recorded sightings peaking in May–July.

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.

SizeUinta 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
28–30 cm11 in–12 in
Weight
210–210 g7.4–7.4 oz

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

Elevation

From 200 georeferenced records, the Uinta Ground Squirrel is recorded from 1,581 m5,187 ft to 3,867 m12,687 ft, with half of sightings below 2,055 m6,742 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 peakJune2,523 records

Seasonality from research-grade observation dates across the US (2,523 records, all years). Reflects when the species is recorded, not a guarantee of presence.

Daily activity clockDiurnal– most active during daylight hours

1,389 uinta ground squirrel observations logged by hour of day. Activity is diurnal (most active during daylight hours), peaking around 9 AM.

12 AM: 1 observations1 AM: 0 observations2 AM: 0 observations3 AM: 4 observations4 AM: 3 observations5 AM: 6 observations6 AM: 3 observations7 AM: 59 observations8 AM: 120 observations9 AM: 131 observations10 AM: 120 observations11 AM: 113 observations12 PM: 114 observations1 PM: 110 observations2 PM: 90 observations3 PM: 105 observations4 PM: 94 observations5 PM: 110 observations6 PM: 96 observations7 PM: 57 observations8 PM: 27 observations9 PM: 10 observations10 PM: 8 observations11 PM: 8 observations12 AM6 AM12 PM6 PM

Based on 1,389 records (all years). Reflects when people record sightings, not only when the animal is active.

Hourly observation counts: 12 AM 1, 1 AM 0, 2 AM 0, 3 AM 4, 4 AM 3, 5 AM 6, 6 AM 3, 7 AM 59, 8 AM 120, 9 AM 131, 10 AM 120, 11 AM 113, 12 PM 114, 1 PM 110, 2 PM 90, 3 PM 105, 4 PM 94, 5 PM 110, 6 PM 96, 7 PM 57, 8 PM 27, 9 PM 10, 10 PM 8, 11 PM 8.

Sounds & calls

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

Best encounter

Where and when to see an Uinta Ground Squirrel

Your best chance: Wyoming, in June, during the day.

Where
WyomingWY
When
June
Time
During the daydiurnal
Trophic relationshipsFood web What a Uinta Ground Squirrel eats, and what eats it.
This speciesUinta Ground Squirrel
Smooth Meadow-grassPoa pratensisCheatgrassBromus tectorum
Eats2

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 Uinta Ground Squirrel (210 g7.4 oz) is an omnivore that first breeds around 1 years, carries a 24-day gestation, and bears about 5.5 young per litter. Maximum recorded longevity is 7 years.

Life cycle

  1. Gestation24 days
  2. Birthlitter of 5.5 young
  3. Sexual maturity1 yr (female) · 2 yr (male)
  4. Maximum recorded longevity7 years

Reproduction

Gestation
24days
Litter size
5.5youngaverage
Litters / year
1litter
Age at first breeding
1years♀ 1 · ♂ 2 yr

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 uinta ground squirrel, and how to tell them apart.

Most of the year happens underground

Uinta ground squirrels emerge when snow retreats and new growth becomes available. They spend the brief warm season feeding, breeding, and storing enough body fat for months below ground. By late summer, many adults have disappeared into burrows. Young animals may remain above ground longer while they build reserves.

That compressed schedule explains the sharp spring and early-summer record pattern. Reports fall when squirrels enter dormancy, not because the animals have left the landscape. An isolated winter observation deserves caution because dates, identifications, and captive records can all create exceptions in a public dataset.

How to recognize a Uinta ground squirrel

This is a moderately sized ground squirrel with a short, lightly marked tail and a mottled brown-gray back. It lacks the bold stripes of a chipmunk and doesn’t have the long bushy tail of a tree squirrel. The face looks compact, with small rounded ears suited to an animal that repeatedly enters narrow burrows.

Range is an important field clue. Uinta ground squirrels occupy a relatively small part of the interior West. Similar ground squirrels meet or approach that range, so a photograph showing the back, tail, and head is more useful than a distant view of an upright animal.

Uinta ground squirrel viewed from behind standing upright in dense green grass and sagebrush
The mottled brown-gray back and short, lightly marked tail show clearly from this angle. Photo: Daughter Dad, CC BY 4.0.

Meadows, sagebrush, and soft ground

Open habitat lets these squirrels watch for danger while feeding close to a burrow. They use grasslands, sagebrush openings, mountain meadows, field edges, and other places where low vegetation grows over soil deep enough to dig. Records cluster strongly in western Wyoming and northern Utah, with smaller extensions into Idaho and Montana.

Most reports come from middle and high elevations, but the broad spread shows that altitude isn’t the only control. Snowmelt timing, soil, and plant growth determine when a site becomes useful. Roads and developed viewpoints also attract observers, so dense report clusters can partly mark easy access.

A colony built on vigilance

Uinta ground squirrels live near one another and communicate with alarm calls. An upright squirrel can scan while others feed, and a warning sends animals toward burrow entrances. Colonial living doesn’t remove danger. Coyotes, foxes, badgers, martens, raptors, and other hunters all take ground squirrels.

Uinta ground squirrel seen from behind and above, hunched low on a bare dirt trail edged with grass
A squirrel pauses low to the ground near cover, ready to bolt for a burrow at the first alarm call. Photo: Daval Davis, CC BY 4.0.

They feed mainly on grasses and other plants, selecting tender growth during the short productive season. Known food links include meadow grasses and cheatgrass. Feeding choices shift as plants mature, and time above ground must balance gathering food against exposure to predators.

One breeding chance after emergence

Mating follows soon after spring emergence. Females give birth in underground nests, and the young appear above ground later in the season. That timing gives juveniles a limited window to learn the colony’s alarm system and gain enough mass before dormancy.

The species’ social life also has costs. Close neighbors compete for food and burrow space, and young animals must find places within or beyond the colony. Rivers and unsuitable habitat can restrict that movement, helping keep the overall range compact.

Secure overall, sensitive to seasonal change

The Uinta ground squirrel is listed as Least Concern, but local colonies depend on a reliable sequence of snowmelt, plant growth, and time to fatten. Drought or unusually timed weather can shorten that sequence. Conversion of open habitat can also break connections between colonies.

Occurrence records are best read as evidence of documented places and seasons. They don’t rank colonies by abundance. Repeated surveys at the same sites are needed to tell a real population change from a change in access, attention, or reporting.

Data & sources

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