Cassin's Vireo
Cassin's VireoCassin's VireoCassin's VireoCassin's Vireo

Cassin's Vireo

Vireo cassinii

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered Endemic
<5% · Rare
overall probability at Olympic National Park
432 Verified records at Olympic National Park
August Best month highest sighting rate
☀️ Diurnal When it's active during daytime hours (6am–6pm)

Cassin's vireo (Vireo cassinii) is a small North American songbird, ranging from southern British Columbia in Canada through the western coastal states of the United States, including California, Oregon, and Washington. The Cassin's Vireo moves down Western United States forests in its migration. During its migration in early spring and late fall, it spends the winter in regions from southern Arizona (the Sonoran Desert) to southern Mexico, including parts of Baja California and the Pacific coast of Mexico. Wikipedia →

<5% of wildlife watchers report a Cassin's Vireo sighting in Olympic National Park, based on 432 days of visitor records from GBIF citizen-science data.

Closest Relatives at Olympic National Park

Warbling Vireo
LC

Warbling Vireo

☀️ Diurnal Bird

Vireo gilvus

5–10% · With luck
Hutton's Vireo
LC Endemic

Hutton's Vireo

☀️ Diurnal Bird

Vireo huttoni

5–10% · With luck
Philadelphia Vireo
LC

Philadelphia Vireo

☀️ Diurnal Bird

Vireo philadelphicus

<5% · Rare
Red-eyed Vireo
LC

Red-eyed Vireo

☀️ Diurnal Bird

Vireo olivaceus

Insufficient data
Yellow-throated Vireo
LC

Yellow-throated Vireo

☀️ Diurnal Bird

Vireo flavifrons

Insufficient data
American Robin
LC Endemic

American Robin

☀️ Diurnal Bird

Turdus migratorius

40–50% · Likely
American Crow
LC

American Crow

☀️ Diurnal Bird

Corvus brachyrhynchos

30–40% · Possible
Song Sparrow
LC Endemic

Song Sparrow

☀️ Diurnal Bird

Melospiza melodia

30–40% · Possible
Chestnut-backed Chickadee
LC

Chestnut-backed Chickadee

☀️ Diurnal Bird

Poecile rufescens

30–40% · Possible
Dark-eyed Junco
LC

Dark-eyed Junco

☀️ Diurnal Bird

Junco hyemalis

30–40% · Possible
Common Raven
LC

Common Raven

☀️ Diurnal Bird

Corvus corax

30–40% · Possible
Spotted Towhee
LC Endemic

Spotted Towhee

☀️ Diurnal Bird

Pipilo maculatus

20–30% · Possible

📅 Monthly Probability

<5
Jan
<5
Feb
<5
Mar
<5
Apr
<5
May
<5
Jun
<5
Jul
<5
Aug
<5
Sep
<5
Oct
<5
Nov
<5
Dec

☀️ When They're Spotted

Most active during daytime hours (6am–6pm) · across all parks (global)

☀️Diurnal
☀️🌙🌙12am6am12pm6pm12am

Global Distribution

Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.

where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is)  ·  parks where it occurs — tap a pin for the sighting probability there

Parks Where Found

# Park Country Probability
1 Yosemite National Park 🇺🇸 United States
20–30%
2 Glacier National Park 🇺🇸 United States
10–20%
3 Jasper National Park 🇨🇦 Canada
5–10%
4 Sequoia and Kings Canyon National Parks 🇺🇸 United States
5–10%
5 Banff National Park 🇨🇦 Canada
5–10%
6 Death Valley National Park 🇺🇸 United States
<5%
7 Zion National Park 🇺🇸 United States
<5%
8 Big Bend National Park 🇺🇸 United States
<5%
9 Great Bear Rainforest 🇨🇦 Canada
<5%
10 Cumbres de Monterrey National Park 🇲🇽 Mexico
<5%
11 Guadalupe Mountains National Park 🇺🇸 United States
<5%
12 Redwood National Park 🇺🇸 United States
<5%
13 Grand Canyon National Park 🇺🇸 United States
<5%
14 Olympic National Park 🇺🇸 United States
<5%
15 Joshua Tree National Park 🇺🇸 United States
<5%
16 Grand Teton National Park 🇺🇸 United States
<5%
17 Rocky Mountain National Park 🇺🇸 United States
<5%
18 Channel Islands National Park 🇺🇸 United States
<5%
19 Reserva de la Biosfera Mariposa Monarca 🇲🇽 Mexico
Insufficient data
20 Yellowstone National Park 🇺🇸 United States
Insufficient data

Quick answers

What are the chances of seeing a Cassin's Vireo in Olympic National Park?

About 1% of wildlife watchers report a Cassin's Vireo sighting in Olympic National Park, based on 432 days of visitor records from GBIF citizen-science data.

When is the best time to see Cassin's Vireo in Olympic National Park?

August has the highest sighting rate for Cassin's Vireo in Olympic National Park in our monthly data.

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