Oregon mammals

Trowbridge's Shrew in Oregon

Sorex trowbridgii

Native to Oregon S4 Apparently Secure in Oregon

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

Trowbridge's shrew beside a penny for scale, holding food in its mouthAI-generated image: Trowbridge's shrew foraging in deep forest leaf litter. No additional license-safe photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracyAI-generated image: Trowbridge's shrew climbing a mossy decaying log. No additional license-safe photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy
Photo: bob-dodge · CC BY 4.0Trowbridge's shrew beside a penny for scale, holding food in its mouthAI-generated image No additional license-safe photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracyTrowbridge's shrew foraging in deep forest leaf litterAI-generated image No additional license-safe photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracyTrowbridge's shrew climbing a mossy decaying log

Trowbridge's Shrew in Oregon, by the numbers

Common in Oregon 30th most recorded of 178 mammals logged in Oregon

4,341 occurrence records
41 with iNaturalist photos
Jul 6, 2026 Last seen in Oregon

Records from 2000–2026.

4,341 total records count every Oregon occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 4,318 records with a full observation date.

When to look for the Trowbridge's Shrew in Oregon

Most sightings fall in July to October.

4,318 Oregon occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly Oregon records (table)
MonthRecords
January55
February52
March65
April150
May335
June208
July809
August954
September696
October644
November304
December46

Monthly trowbridge's shrew occurrence records (iNaturalist and GBIF) in Oregon, 2000–2026.

Seasonality

Year-round in Oregon, with recorded sightings peaking in July–October.

Occurrence map

Where Trowbridge's Shrew has been recorded in Oregon

300 records mapped · zoom and drag to explore

300 Oregon records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Siuslaw National Forest 129
McDonald-Dunn Research Forest 6
Mt. Hood National Forest 3
Lewis and Clark National Historical Park 3
Oregon Islands National Wildlife Refuge Wilderness Area 2
Columbia River Gorge National Scenic Area 1
E.E. Wilson Wildlife Area 1
Oregon Caves National Monument and Preserve 1

Protected places with the most trowbridge's shrew 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 Oregon

CountyRecords
Douglas County 1,304
Lane County 1,085
Lincoln County 419
Tillamook County 404
Linn County 367
Benton County 166
Washington County 159
Coos County 73
Multnomah County 64
Clackamas County 52
Jackson County 50
Clatsop County 37
8 other counties 161

The complete county distribution, spread across 20 Oregon counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Trowbridge’s shrew records in Oregon lean toward moist western forests and foothills, with a named foothold in the Columbia River Gorge and additional context from the Willamette Valley. The monthly series is strongly concentrated from May through October, especially May and late summer, while winter reports are scarce. Much of that pattern may reflect detectability and collection effort; record totals are evidence of documentation, not shrew abundance.

Occurrence data from iNaturalist and GBIF.

Trowbridge's shrew beside a penny for scale, holding food in its mouth
Full species profile Trowbridge's Shrew Sorex trowbridgii Size 6.8 cm2.7 in Weight 4 g0.1 oz Lifespan Up to 1.5 yr View the full profile

More mammals in Oregon 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"