Valley Oak
Quercus lobata
Last reviewed: June 2026
Quercus lobata (Valley Oak) is California's largest native oak, thriving in full sun with low water needs. This deciduous tree blooms in spring and provides critical habitat for wildlife in Central Valley and foothill regions.
Valley Oak (Quercus lobata) is not on the ASPCA Animal Poison Control Center toxic plant list for dogs or cats (aspca.org (opens in new tab), last reviewed 2026-05-21). If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
The USDA PLANTS Database (opens in new tab) does not flag Valley Oak as toxic to livestock.
Light
full sun
Water
low
Size
240"–600" H × 240"–600" W
Bloom
N/A
Native to
CA
Browse plants for this ecoregion
Valley oak is a large native oak tree, growing up to 50 feet tall with a broad, majestic canopy. It features deeply lobed, deciduous leaves and produces acorns in the fall. This long-lived, drought-tolerant tree thrives in full sun and requires very little water once established.
Growing Valley Oak
Grow Valley Oak in full sun and low water. Mature plants reach 240 to 600 inches tall and spread 240 to 600 inches wide. Expect moderate maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Valley Oak takes more care to keep looking intentional in a front yard. Maintenance level: moderate. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Extremely large size (20-50 feet) exceeds most front yard spaces
- Extensive root system may damage foundations, sidewalks and utilities
- Drops large quantities of leaves and acorns that require cleanup
Wildlife value
Valley oaks are keystone species supporting hundreds of wildlife species. Their acorns provide essential food for deer, squirrels, birds, and other animals, while the trees offer critical nesting habitat and shelter.
Common questions
- Where does Valley Oak naturally grow?
- Valley Oak is native to California, primarily found in the Central Valley and surrounding foothills from sea level to about 2,000 feet elevation.
- When does Valley Oak bloom?
- Valley Oak typically blooms from March to May, producing inconspicuous wind-pollinated flowers before or as leaves emerge.
- How much water does Valley Oak need?
- Valley Oak is drought tolerant once established, requiring minimal supplemental water in most California climates. Deep, infrequent watering mimics natural rainfall patterns.
- How large do Valley Oaks grow?
- Valley Oak can reach 60-100 feet tall with an equally wide canopy, making it one of the largest oak species in North America and requiring significant space to mature.
- Is Valley Oak toxic to dogs?
- Valley Oak is not on the ASPCA Animal Poison Control Center toxic plant list for dogs (aspca.org).
- Is Valley Oak toxic to cats?
- Valley Oak is not on the ASPCA Animal Poison Control Center toxic plant list for cats (aspca.org).
- Is Valley Oak toxic to livestock?
- The USDA PLANTS Database does not flag Valley Oak as toxic to livestock.
- Is Valley Oak HOA-friendly?
- Valley Oak takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Ready to grow Valley Oak? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Not sure where to start? Take the 2-minute yard quiz