Maryland mammals

North American Deermouse in Maryland

Peromyscus maniculatus

Native to Maryland S5 Secure in Maryland

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

Deer Mouse (Peromyscus maniculatus) (9310532204)DiGangi-DeermousePeromyscus maniculatusDeer mouse peering out from a lichen-covered tree crook beside a green leafDeer mouse braced on a bark-stripped log, ears forward and alert
Photo: Seney Natural History Association · CC BY-SA 2.0Deer Mouse (Peromyscus maniculatus) (9310532204)Photo: 6th Happiness · CC BY-SA 3.0DiGangi-DeermousePhoto: (Picture courtesy of the CDC and the Partnership, Inc.) · CC BY 2.5Peromyscus maniculatusPhoto: USFWS Mountain-Prairie · CC BY-SA 4.0Deer mouse peering out from a lichen-covered tree crook beside a green leafPhoto: Gregory "Slobirdr" Smith · CC BY-SA 2.0Deer mouse braced on a bark-stripped log, ears forward and alert

North American Deermouse in Maryland, by the numbers

Occasional in Maryland 43rd most recorded of 100 mammals logged in Maryland

29 occurrence records

Records from 2000–2026.

29 total records count every Maryland occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 28; the monthly chart covers the 28 records with a full observation date.

When to look for the North American Deermouse in Maryland

Most sightings fall in June to July.

28 Maryland occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence. Based on a small number of dated records; the seasonal pattern may not be representative.

Monthly Maryland records (table)
MonthRecords
January0
February2
March4
April4
May0
June4
July6
August2
September1
October0
November2
December3

Monthly north american deermouse occurrence records (iNaturalist and GBIF) in Maryland, 2000–2026.

Seasonality

Year-round in Maryland, with recorded sightings peaking in June–July, with a smaller rise in March–April.

Occurrence map

Where North American Deermouse has been recorded in Maryland

28 records mapped · zoom and drag to explore

28 Maryland records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Mckee Beshers Wildlife Management Area 1

Protected places with the most north american deermouse 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 Maryland

CountyRecords
Frederick County 9
Anne Arundel County 8
Garrett County 7
Montgomery County 3
Baltimore County 1
Other localities 1

The complete county distribution, spread across 5 Maryland counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

North American deermouse is one of the most broadly distributed small mammals on the continent, and Maryland’s records near Blackwater, Eastern Neck, and Assateague Island reflect just a sliver of a range that spans nearly every habitat type in North America. NatureServe ranks the species S5, Secure, statewide.

Records rise in April and again from June through July, a pattern that likely tracks small-mammal trapping-survey timing as much as this mouse’s own breeding calendar, since it reproduces across most of the warmer months.

Deer Mouse (Peromyscus maniculatus) (9310532204)
Full species profile North American Deermouse Peromyscus maniculatus Size 8–10 cm3.1–3.9 in Weight 21 g0.7 oz Lifespan Up to 8.3 yr View the full profile

More mammals in Maryland 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"