If you’ve driven north of Sherman on Highway 377 and wondered what that brown state park sign is pointing toward, the answer is about 29,000 acres of reservoir, cedar-studded shoreline, and a trail system that will make you feel considerably less guilty about skipping the gym. Ray Roberts Lake State Park sits roughly 25 miles southwest of Sherman, and the Isle du Bois unit on the lake’s south shore is the one most locals treat as their default outdoor errand when cabin fever sets in.
The park runs on the Texas State Parks day-pass system: $7 per adult, free for kids 12 and under, and you’ll want to reserve that pass online before you show up on a Saturday morning in spring and find the parking lot full of Denton County families who had the same idea. Weekdays are a different story entirely. Show up on a Tuesday and you may have a mile of lakefront trail more or less to yourself.
The trail situation is legitimately good. The main hiking and mountain biking trail loops for around 12 miles through post oak and juniper with enough elevation change to feel like actual terrain — not a flat Texas disappointment. There’s a shorter out-and-back option along the water if you’re not trying to earn anything in particular. Equestrians have their own designated corridor, which is a nice detail that keeps the trail from becoming a horse-and-jogger negotiation. Bikes are allowed on most surfaces, and the singletrack near the lake is legitimately fun in a way that surprises people who expect North Texas to offer nothing but flat dirt.
Camping is available with options ranging from basic tent sites to screened shelters to full hookup sites for RVs, and several of the waterfront spots are genuinely nice — fire rings, picnic tables, and an actual view of the water rather than a view of the back of someone else’s camper. Sites book fast on spring and fall weekends, so plan ahead if you’re thinking overnight.
Fishing is taken seriously here. Largemouth bass, white bass, catfish, and crappie are all present in the lake, and you’ll see a fair number of people with serious setups working the coves in the early morning. A valid Texas fishing license is required; the park doesn’t sell them on-site, so sort that out in advance at any local sporting goods store or through the TPWD app.
The swim area is open seasonally, marked and watched over by a small beach that fills up in summer with exactly the crowd you’d expect — kids, inflatable floaties, and people eating sandwiches in folding chairs. It’s fine. It’s a public beach at a lake. Manage expectations accordingly.
What makes Isle du Bois worth the drive from Sherman is proportion. It’s big enough that it doesn’t feel like an overcrowded city park, but close enough — less than 30 minutes — that it doesn’t require a production to visit. Pack water, wear closed-toe shoes on the trails, and don’t assume you’ll have cell service the whole time. The park entrance is on FM 455 just off 377. The ranger station staff are generally helpful and not in a hurry, which feels like the right speed for a place that exists to slow things down.
