Oregon’s 84 jumping mouse records since 2000, all from iNaturalist, spread across 16 counties in a way no single hotspot explains. Lincoln and Clatsop counties on the coast lead with 13 and 10, Lane adds 10, and the rest scatter through the Willamette Valley and the western Cascade foothills. Lewis and Clark National Historical Park and the Siuslaw National Forest are among the few named places with multiple reports, three apiece, which says plenty about how thin the file is.
The spread actually tells the more believable story. This is a mouse of wet meadows and stream edges, and western Oregon is full of both, so a wide scatter of single-digit county totals fits a species that’s genuinely widespread but rarely noticed. Reports crest in July and August, the height of both mouse activity and observer traffic, before the animals den up for one of the longest hibernations of any North American rodent. NatureServe hasn’t ranked it in Oregon. The honest summary: present across the west side, documented almost nowhere in depth.
Full species profile
