Bonelli Park Goes Quiet on Mondays. The Rest of San Dimas Didn't Get the Memo.

Show up at the Puddingstone boat launch on a Monday morning and you will find the gate down, no matter how good the fishing looked the day before. Drive fifteen minutes north to the trailhead off San Dimas Canyon Road that same morning and you will find the parking lot filling up, restrooms open, dogs on leashes heading up toward the oak canopy like it's any other day of the week. Same city. Same county government, technically. Two completely different Mondays.

That split isn't random, and it isn't temporary. It traces back to a specific decision made in June 2025, and more than a year later it's still shaping how San Dimas spends its weekdays.

What actually happened at Puddingstone

In June 2025, the Los Angeles County Department of Parks and Recreation announced it was closing six regional parks two days a week, Mondays and Tuesdays, to absorb a $22.2 million budget reduction. Frank G. Bonelli Regional Park, home to Puddingstone Reservoir, was one of the six. The others were Castaic Lake, Kenneth Hahn, Peter F. Schabarum, Santa Fe Dam, and Whittier Narrows. The closures took effect June 30, 2025, cutting the parks' operating week from seven days down to five.

At Bonelli specifically, the closure isn't just a locked gate. The 250-acre lake itself shuts down for swimming, boating, and fishing on those two days, which matters more here than at a park without water. Bonelli's draw has always been the reservoir: 14 miles of multi-use trail wrap around it, but the boat launch, with its 180 trailer parking spots and room for craft up to 26 feet, is the reason a lot of San Dimas households treat the park as a weekly stop rather than an occasional outing. Take two days off that schedule and you take away the exact two days some people had built their routine around.

The first summer under the new rules also saw the county's aquatic season shrink from 23 weeks down to 11, running June 2 through August 16, 2025, and the free evening programming known as Parks After Dark got suspended at 34 parks countywide. Those two cuts were tied to that specific budget cycle. The Monday and Tuesday closures were not a one-summer fix. As of August 2026, Bonelli's own posted hours still run Wednesday through Sunday only. This is now just how the park operates.

The list that matters more than "county parks"

Here's the part that gets flattened every time this story gets repeated secondhand: it wasn't a countywide shutdown. It was six specific parks, named individually in the county's own announcement. That distinction is easy to miss and expensive to miss if you're the one driving to a closed gate.

San Dimas has two other LA County-maintained recreation areas sitting close enough to Bonelli that a casual visitor could assume they're under the same rules. They aren't. San Dimas Canyon Community Regional Park, 138 acres tucked into the base of the San Gabriel foothills, was never on the closure list. Neither was Walnut Creek Regional Park, which is where the Michael D. Antonovich Trail runs. Both are county property. Neither lost a single operating day.

That's the piece worth carrying around: the cut wasn't applied to "LA County parks" as a category. It landed on six named properties, most of them large lake-centered destinations with higher operating costs. A county-run park without a lake, a marina, or a fleet of lifeguards to staff kept its normal week because it never carried that overhead in the first place.

Where San Dimas actually rerouted its Mondays and Tuesdays

Once you know the boundary, the pattern of where people ended up makes sense.

San Dimas Canyon Community Regional Park has become the default for anyone who wants a short, family-friendly loop without checking a closure calendar first. The park's namesake trail, San Dimas Canyon Park Trail, is a 1.2-mile loop with about 209 feet of elevation gain, starting from a lot off San Dimas Canyon Road with restrooms on site. It's also the access point for two things that give the park more character than its size suggests: the Trail of the Padres, tracing a route once used by Spanish Franciscan missionaries, and a connector into the Pacific Crest Trail, meaning a short local walk and one of the country's longest hiking routes technically share a trailhead.

For dog owners and horse people specifically, Horsethief Canyon Park has picked up the slack in a different way. It isn't a county property at all, which means it was never in scope for these cuts to begin with. It has its own dog park, a playground, picnic areas, and trail access to both Sycamore Canyon Trail and Poison Oak Trail, along with protected wilderness horse trails that Bonelli doesn't offer in the same form.

Runners and cyclists have leaned harder on the Michael D. Antonovich Trail, which AllTrails lists as the most reviewed trail in San Dimas, with an average 4.5-star rating across more than 4,400 reviews. It runs through Walnut Creek Regional Park, the other county property that sidestepped the 2025 cuts entirely.

None of this replaces what Bonelli offers on the water. Nothing else in town has a 250-acre reservoir with jet ski access and a marina. But for the two days a week when that water isn't available, San Dimas already has a second infrastructure of parks and trails that never noticed the budget cut at all, because it was never counted in it.

A year in, and still worth checking before you go

The most useful thing about this story now, more than a year after it started, is that it has stopped being news and started being a fact of how the week works here. If you moved to San Dimas after June 2025, Bonelli's five-day week is simply normal to you. If you've been here longer, it's worth double-checking which day you're planning around, because the gap between "county park" and "one of the six" is still the detail that decides whether your Monday plan holds up.

San Dimas has never been short on places to spend an afternoon outdoors. What changed is which ones you can count on for which days, and that's a distinction that only shows up once you've actually gone looking for it, which is exactly the kind of local detail that separates people who've lived here a while from people who are still learning the map.

If you're weighing a move into San Dimas, or you already call it home and are curious what else has shifted around town, our San Dimas neighborhood guide is a good place to keep exploring, and Maureen Haney and the team are always glad to talk through what makes a specific pocket of the San Gabriel Valley worth knowing before you plant roots there.