Nevada mammals

Western Harvest Mouse in Nevada

Reithrodontomys megalotis

Native to Nevada S4 Apparently Secure in Nevada

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

Western harvest mouse moving through dry stems and gravelWestern harvest mouse on reddish soilWestern harvest mouse among dry leaves and stemsWestern harvest mouse beside a building threshold
Photo: Jeremiah Degenhardt · CC-BYWestern harvest mouse moving through dry stems and gravelPhoto: Jay Pruett · CC-BYWestern harvest mouse on reddish soilPhoto: Laura Castellini · CC-BYWestern harvest mouse among dry leaves and stemsPhoto: Wendy McCrady · CC-BYWestern harvest mouse beside a building threshold

Western Harvest Mouse in Nevada, by the numbers

Common in Nevada 40th most recorded of 142 mammals logged in Nevada

809 occurrence records
14 with iNaturalist photos
Jun 1, 2026 Last seen in Nevada

Records from 2000–2026.

809 total records count every Nevada occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 806 records with a full observation date.

When to look for the Western Harvest Mouse in Nevada

Most sightings fall in May to July.

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

Monthly Nevada records (table)
MonthRecords
January26
February12
March67
April30
May180
June118
July192
August70
September27
October16
November34
December34

Monthly western harvest mouse occurrence records (iNaturalist and GBIF) in Nevada, 2000–2026.

Seasonality

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

Occurrence map

Where Western Harvest Mouse has been recorded in Nevada

300 records mapped · zoom and drag to explore

300 Nevada records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Great Basin National Park 34
Toiyabe National Forest 18
Key-Pittman Wildlife Management Area 7
Pine Forest Range Wilderness Area 5
Death Valley National Park 4
Black Rock Desert Wilderness Area 4
Tule Springs Fossil Beds National Monument 2
Lake Mead National Recreation Area 2

Protected places with the most western harvest 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 Nevada

CountyRecords
Nye County 106
White Pine County 98
Clark County 90
Churchill County 83
Washoe County 72
Humboldt County 72
Lincoln County 67
Lyon County 46
Esmeralda County 38
Elko County 33
Lander County 32
Mineral County 22
5 other counties 50

The complete county distribution, spread across 17 Nevada counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Nevada records for the western harvest mouse have a limited set of named hotspots, led by Great Basin National Park. That gap may reflect where people look and report, so it doesn’t prove absence elsewhere.

These sites tie the Nevada record pattern to the state’s long mountain spine. Records from separate ranges matter because Nevada’s high country is broken into isolated peaks. The strongest reporting falls in summer, when Nevada’s high country is easiest to reach but low deserts are hottest. That may shape where observers submit records.

The file combines 14 research-grade iNaturalist records and 802 GBIF records. Those 816 records measure documented encounters, not Nevada’s population size. It’s native to Nevada. Nevada doesn’t specifically list it under the state’s conservation framework, and the IUCN lists it as Least Concern.

Occurrence data from iNaturalist and GBIF.

Western harvest mouse moving through dry stems and gravel
Full species profile Western Harvest Mouse Reithrodontomys megalotis Size 11.8–17 cm4.6–6.7 in Weight 11 g0.4 oz Lifespan 1 yr View the full profile

More mammals in Nevada 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"