Western Rattlesnake
Western RattlesnakeWestern RattlesnakeWestern RattlesnakeWestern Rattlesnake

Western Rattlesnake

Crotalus oreganus

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
20–30% · Possible
overall probability at Yosemite National Park
185 Verified records at Yosemite National Park
June Best month highest sighting rate
☀️🌙 Day & Night When it's active Active throughout day and night

Crotalus oreganus, commonly known as the Western rattlesnake or northern Pacific rattlesnake, is a venomous pit viper species found in western North America from the Baja California Peninsula to the southern interior of British Columbia. Wikipedia →

20–30% of wildlife watchers report a Western Rattlesnake sighting in Yosemite National Park, based on 185 days of visitor records from GBIF citizen-science data.

📅 Monthly Probability

10–20
Jan
<5
Feb
<5
Mar
10–20
Apr
30–40
May
30–40
Jun
30–40
Jul
20–30
Aug
20–30
Sep
10–20
Oct
<5
Nov
<5
Dec

☀️🌙 When They're Spotted

Active throughout day and night · across all parks (global)

☀️🌙Day & Night
☀️🌙🌙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 Sequoia and Kings Canyon National Parks 🇺🇸 United States
30–40%
2 Zion National Park 🇺🇸 United States
20–30%
3 Grand Canyon National Park 🇺🇸 United States
20–30%
4 Yosemite National Park 🇺🇸 United States
20–30%
5 Death Valley National Park 🇺🇸 United States
10–20%
6 Channel Islands National Park 🇺🇸 United States
10–20%
7 Redwood National Park 🇺🇸 United States
5–10%
8 Joshua Tree National Park 🇺🇸 United States
5–10%
9 El Vizcaíno Biosphere Reserve 🇲🇽 Mexico
Insufficient data

Quick answers

What are the chances of seeing a Western Rattlesnake in Yosemite National Park?

About 27% of wildlife watchers report a Western Rattlesnake sighting in Yosemite National Park, based on 185 days of visitor records from GBIF citizen-science data.

When is the best time to see Western Rattlesnake in Yosemite National Park?

June has the highest sighting rate for Western Rattlesnake in Yosemite National Park in our monthly data.

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