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Montana Field Guide

Montana Field Guides

Heermann's Gull - Larus heermanni

Native Species
Accidental Species

Global Rank: G4
State Rank: SNA

Agency Status


External Links

General Description
About 95% of the global Heermann’s Gull population breed on Isla Rasa, a tiny 142 acre Island in the Gulf of California. The nonbreeding range of this species is along the Pacific Coast from southern British Columbia to Guatamala (Islam and Velarde 2020).

Heermann’s Gull is accidental in Montana. The species was first detected in the state in 2018.

Observations in Montana Natural Heritage Program Database
Number of Observations: 2

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density


SUMMER (Feb 16 - Dec 14)
Direct Evidence of Breeding

Indirect Evidence of Breeding

No Evidence of Breeding

WINTER (Dec 15 - Feb 15)
Regularly Observed

Not Regularly Observed


(Observations spanning multiple months or years are excluded from time charts)

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Citation for data on this website:
Heermann's Gull — Larus heermanni.  Montana Field Guide.  .  Retrieved on , from