The Great Valley Grasslands State Park is east of Gustine in central California’s San Joaquin Valley. It conserves an extraordinary last remnant of native grassland. It includes stretches of wildflower-carpeted plains, seasonal wetlands, and riverside riparian habitat. These areas feel like stepping back in time.
What Makes Great Valley Grasslands State Park Unique
This 2,826-acre preserve protects one of the few remaining intact native grasslands on the valley floor. It includes vernal pool ecosystems and riparian corridors. These have remained unplowed and unurbanized since pre‑settlement. The park hosts rare species such as endangered Delta button celery, vernal pool fairy shrimp, tiger salamander, and giant garter snake. Each spring, it transforms into a vibrant tapestry of wildflowers amid vast wetlands of the Grasslands Ecological Area.
Top Activities & Amenities
Hiking Trails & Wildlife Viewing
Levees and dirt roads form a basic but scenic trail network across rolling grasslands and wet meadows. Ideal for walking, biking, bird watching, and photography, the trails pass through native bunchgrass stands and offer wide views of San Joaquin River floodplain wetlands.
Fishing & Boating
The park includes the former Fremont Ford Recreation Area—longtime favorite for riverbank trout and bass fishing. Non-motorized boating like canoeing, kayaking and paddleboarding is possible along the riverine backwaters.
Bird Watching & Interpretive Programs
In winter, the park fills with migratory waterfowl, shorebirds and raptors. Occasional interpretive events, pop-up bird walks, and seasonal wildlife-watching programs offer guided insight into grassland, wetland and riparian ecology.
Picnic Areas & Group Facilities
Several shaded picnic spots near the parking lot offer tables, BBQ grills, and fire rings. These spots also provide drinking water. They are ideal for lunches or small gatherings. A modest group-camping area accommodates youth groups and families on a first-come basis.
Camping & RV Access
Overnight facilities are limited. A group camping zone near the river supports small tents and RVs without hookups; dump station access is not yet available. The park remains primarily a day-use destination.
Visitor Center & Educational Exhibits
No traditional visitor center exists. However, interpretive kiosks provide information about native plant communities. Trailhead signage explains wetland ecology and species protection efforts. Plans are underway for expanded accessible trails and educational infrastructure.
Practical Visitor Tips
- Hours & Fees: Open daily 8 a.m.–5 p.m.; no entry fee; free day-use and group camping.
- Parking & Access: Gravel parking area off Highway 165 near Stevinson; arrive early during spring wildflower season.
- Camping: Group camping only—no hookups or advance reservations; bring your own water and supplies.
- Pet Rules: Dogs are allowed on a six-foot leash in day-use areas and group campground—clean up required.
- Trail Conditions: Levee roads can be dusty, muddy after rain—sturdy footwear is advised. No formal mountain bike or equestrian trails as of yet.
- Wildlife Safety: Stay on established routes to protect sensitive vernal pools and endangered species; observe wildlife from a distance.
- Restrooms & Amenities: Vault toilets and drinking water at parking and picnic sites; no showers or visitor center.
- Access Improvements: EV charging is available nearby; accessible trail segments under development.
Local Insight & Hidden Gem
The best time to visit is late March through May. During this period, wildflower season peaks. Freshwater ponds reflect golden grass, and shorebirds swarm overhead. For photographers, early morning mist over the floodplain creates ethereal scenes. On quieter weekdays, walk farther from the lot to find blooming alkali sacaton grasslands nearly untouched by human presence. And if you want to paddle, launch a canoe from the riverbank at Fremont Ford—the serene back-channel offers peaceful wildlife encounters only minutes from the parking area.