Iowa mammals

Big Brown Bat in Iowa

Eptesicus fuscus

Native to Iowa S4 Apparently Secure in Iowa

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

Big Brown Bat in Iowa, by the numbers

Common in Iowa 19th most recorded of 74 mammals logged in Iowa

92 occurrence records
88 with iNaturalist photos
Jul 7, 2026 Last seen in Iowa

Records from 2000–2026.

92 total records count every Iowa occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 82; the monthly chart covers the 82 records with a full observation date.

When to look for the Big Brown Bat in Iowa

Most sightings fall in August to September.

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

Monthly Iowa records (table)
MonthRecords
January3
February6
March0
April7
May2
June14
July8
August15
September12
October8
November4
December3

Monthly big brown bat occurrence records (iNaturalist and GBIF) in Iowa, 2000–2026.

Seasonality

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

Occurrence map

Where Big Brown Bat has been recorded in Iowa

82 records mapped · zoom and drag to explore

82 Iowa records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Maquoketa Caves State Park 4
Iowa Lakeside Lab 2
MacBride Recreation Area 1
Brush Creek Canyon State Preserve 1
Wildcat Den State Park 1

Protected places with the most big brown bat 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 Iowa

CountyRecords
Polk County 10
Johnson County 8
Marshall County 7
Linn County 6
Jackson County 5
Sioux County 5
Story County 4
Marion County 3
Plymouth County 2
Black Hawk County 2
Madison County 2
Louisa County 2
23 other counties 36

The complete county distribution, spread across 35 Iowa counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Big brown bats are among Iowa’s most adaptable bats, roosting in buildings as well as tree cavities and feeding over water, woodland edges, and open neighborhoods. Their tolerance of developed landscapes helps keep them visible even where natural roosts are limited.

Maquoketa Caves State Park, the wooded Driftless Area, and the Upper Mississippi refuge corridor all pair roosting structure with productive insect habitat. Caves and occupied roosts should never be entered or disturbed, particularly during hibernation or maternity season.

The record set spans the year but is dominated by active-season observations, especially June and August. Midwinter reports may involve hibernacula or indoor discoveries rather than bats routinely flying in Iowa cold.

Occurrence data from iNaturalist and GBIF.

More mammals in Iowa in the atlas

Data & sources

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