Minnesota’s plains pocket mouse file is thin and getting old: 61 records in the open databases, and the most recent of them dates to July 2015. All but four come from Sherburne County, a concentration that tells you one well-worked patch of ground can dominate a statewide picture. Records like these mark where people have searched, not necessarily where the mouse is holding on best.
A sand-plain outpost at the range’s northeast corner
Minnesota sits at the very northeast edge of this species’ range, and the records land exactly where the geography says they should. Sherburne and Anoka counties, which together hold 59 of the 61 reports, both sit on the Anoka Sand Plain, a broad stretch of sandy glacial outwash along the Mississippi and St. Francis rivers. A burrowing mouse that needs loose, dry soil would find little to work with in the state’s farm country or north woods, but this sand plain suits it. Single records from Clay and Dakota counties hint that the real footprint could run wider than the surveys have shown.
An April spike that raises an eyebrow
Minnesota reports peak in April, an odd season for a mouse that spends winter underground in torpor and raises its young in summer. The likely explanation is survey timing: spring is when mammalogists and refuge biologists run traplines, and a freshly emerged pocket mouse is easier to catch than one that never stirred. Treat the monthly pattern as a record of effort layered over biology.
A decade of silence
No verified Minnesota record has landed since 2015, and NatureServe ranks the species S3, vulnerable, in the state. A gap like that doesn’t prove the mouse is gone; a nocturnal animal on a little-visited sand plain can slip past a decade of casual eyes. It does mean any fresh, documented sighting from east-central Minnesota would carry real weight.
Full species profile
