California’s porcupine record, 331 sightings across 40 counties, belongs to the forested north and the high Sierra. Del Norte County leads with 73 records, anchored by Tolowa Dunes State Park at 34, while El Dorado, Siskiyou, Nevada, and Modoc counties and the Lake Tahoe basin carry the record down the Sierra and across the northeast.
A bark-eater in the conifers
Porcupines are big, slow rodents built around a simple defense, a coat of roughly thirty thousand quills raised when threatened and driven in when a predator presses its luck. They climb well and feed in trees, taking leaves and buds in summer and shifting to the inner bark of conifers through winter, a habit that can girdle and kill favored trees. They den in rock piles, hollow logs, and root tangles and move mostly at night, so most encounters come at dusk or by flashlight on a forest road.
Active all winter, busiest in fall
Porcupines do not hibernate. They hole up during the worst weather but emerge to feed on bark even in deep snow, and California’s record never goes quiet in any month. Counts run highest from midsummer into fall, topping out in November, the heart of the breeding season, when males range widely and their high, eerie calls carry through the night woods. Yosemite National Park, Lassen Volcanic National Park, and the Tahoe-area forests all contribute to that autumn rise.
Status in California
The North American porcupine is not specifically listed under California’s conservation framework, and the IUCN lists it as Least Concern. It is a native species in the state, and USGS NAS does not treat it as nonindigenous anywhere in its California range.
Full species profile
