California mammals

Yuma Myotis in California

Myotis yumanensis

Native to California S4 Apparently Secure in California

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

IUCN Red List status

LC – Least Concern

Widespread and abundant; not at risk.

Photo: Don Loarie · CC BY 4.0Yuma myotis crouched on the ground at nightPhoto: Amelia Tauber · CC BY 4.0Yuma myotis roosting on a wooden surfacePhoto: Wendy McCrady · CC BY 4.0Yuma myotis roosting on a wallPhoto: Juan Cruzado Cortés · CC BY-SA 4.0Yuma myotis hanging from a cave wallPhoto: Juan Cruzado Cortés · CC BY-SA 4.0Yuma myotis on a pale wall

Photo: Don Loarie · CC BY 4.0Yuma myotis crouched on the ground at nightPhoto: Amelia Tauber · CC BY 4.0Yuma myotis roosting on a wooden surfacePhoto: Wendy McCrady · CC BY 4.0Yuma myotis roosting on a wallPhoto: Juan Cruzado Cortés · CC BY-SA 4.0Yuma myotis hanging from a cave wallPhoto: Juan Cruzado Cortés · CC BY-SA 4.0Yuma myotis on a pale wall

Yuma Myotis in California, by the numbers

Occasional in California 98th most recorded of 241 mammals logged in California

2,617 occurrence records

103 with iNaturalist photos

Records from 2000–2026.

2,617 total records count every California occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 2,602 records with a full observation date.

When to look for the Yuma Myotis in California

Most sightings fall in May to September.

2,602 California occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly California records (table)

Month	Records
January	21
February	12
March	38
April	205
May	366
June	342
July	523
August	396
September	460
October	145
November	29
December	65

Monthly yuma myotis occurrence records (iNaturalist and GBIF) in California, 2000–2026.

Seasonality

Year-round in California, with recorded sightings peaking in May–September.

Occurrence map

Where Yuma Myotis has been recorded in California

300 records mapped · zoom and drag to explore

300 California records mapped

Notable places to look

Park, forest, or monument	iNaturalist records
Phillip Burton Wilderness Area	197
Tahoe National Forest	105
Eagle Lake Field Station	94
Fort Tejon State Historic Park	68
Big Basin Redwoods State Park	54
Los Padres National Forest	23
Riverside Mountains Wilderness Area	19
Inyo National Forest	13

Protected places with the most yuma myotis 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 California

County	Records
San Diego County	429
Marin County	219
Kern County	197
Placer County	146
Riverside County	142
Lake County	131
San Bernardino County	117
Butte County	100
Lassen County	95
Imperial County	83
Napa County	77
Alameda County	73
42 other counties	808

The complete county distribution, spread across 54 California counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Water is the thread linking California’s Yuma myotis records. Around Yosemite, Sequoia National Forest, and Lake Tahoe, lakes and streams provide insect-rich feeding areas, while bridges, buildings, trees, and rock openings can supply nearby daytime shelter.

Reports jump in April and stay high through September, with the largest total in July and a second strong showing in September. Cold-season observations are sparse, especially in February. Both bat activity and survey effort favor warm nights, so this pattern describes when Yuma myotis were recorded rather than how many were present.

Occurrence data from iNaturalist and GBIF.

Full species profile Yuma Myotis Myotis yumanensis Size 8.4–9.9 cm3.3–3.9 in Weight 6 g0.2 oz Lifespan Up to 14 yr View the full profile

More mammals in California 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"