Pennsylvania mammals

Silver-haired Bat in Pennsylvania

Lasionycteris noctivagans

Native to Pennsylvania S1 Critically Imperiled in Pennsylvania

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

IUCN Red List status

LC – Least Concern

Widespread and abundant; not at risk.

Photo: Mark Richman · CC BY 4.0Silver-haired bat tucked into loose barkPhoto: David LaMagna · CC BY 4.0Silver-haired bat roosting against barkPhoto: David LaMagna · CC BY 4.0Silver-frosted back of a silver-haired batPhoto: Jeff Bartlett · CC BY 4.0Live silver-haired bat perched on a rock face

Photo: Mark Richman · CC BY 4.0Silver-haired bat tucked into loose barkPhoto: David LaMagna · CC BY 4.0Silver-haired bat roosting against barkPhoto: David LaMagna · CC BY 4.0Silver-frosted back of a silver-haired batPhoto: Jeff Bartlett · CC BY 4.0Live silver-haired bat perched on a rock face

Silver-haired Bat in Pennsylvania, by the numbers

Occasional in Pennsylvania 35th most recorded of 77 mammals logged in Pennsylvania

58 occurrence records

52 with iNaturalist photos

Records from 2000–2026.

58 total records count every Pennsylvania occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 52; the monthly chart covers the 52 records with a full observation date.

When to look for the Silver-haired Bat in Pennsylvania

Most sightings fall in October to November.

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

Monthly Pennsylvania records (table)

Month	Records
January	1
February	3
March	1
April	1
May	3
June	1
July	3
August	1
September	4
October	14
November	13
December	7

Monthly silver-haired bat occurrence records (iNaturalist and GBIF) in Pennsylvania, 2000–2026.

Seasonality

Year-round in Pennsylvania, with recorded sightings peaking in October–November.

Occurrence map

Where Silver-haired Bat has been recorded in Pennsylvania

52 records mapped · zoom and drag to explore

51 Pennsylvania records mapped

Where it's recorded in Pennsylvania

County	Records
Philadelphia County	12
Montgomery County	5
Bucks County	4
Delaware County	3
Lancaster County	2
Crawford County	2
Berks County	1
Dauphin County	1
Allegheny County	1
Erie County	1
Other localities	26

The complete county distribution, spread across 10 Pennsylvania counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Tree cover beside open flight space links Pennsylvania’s silver-haired bat records at Pymatuning, Delaware Water Gap, and Presque Isle. The Lake Erie setting at Presque Isle may make seasonal movement especially visible compared with sheltered inland forest edges.

Records rise from October through December rather than midsummer and may include migrating bats, grounded animals, or finds around buildings. The late-year pattern shows when observations accumulated, not winter abundance.

Occurrence data from iNaturalist and GBIF.

Full species profile Silver-haired Bat Lasionycteris noctivagans Size 9.5–11.5 cm3.7–4.5 in Weight 11 g0.4 oz Lifespan 12 yr View the full profile

More mammals in Pennsylvania 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