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Running trails in Diamond Bar, CA
Diamond Bar has 8 trails in the directory — 3 loops that return to the trailhead, 1 with a stated distance, 5 shaded, and 1 open 24 hours. 7 of them post opening hours, so you can check the gate before an early start. They're ranked here by rating weighted by review volume, across 2,734 Google reviews. Filter by surface, loop, distance, shade or lighting to get to the run you're actually planning — no made-up difficulty score, just the facts you'd check before driving out.
Sycamore Canyon Park
4.7 ★★★★★ 931 reviews
City land with a playground, ball field, BBQ grill, picnic tables, exercise stations & nature trail.
Steep Canyon Trail
4.7 ★★★★★ 462 reviews
Looping hiking route featuring steep slopes and views of the surrounding hills.
Carlton J. Peterson Park
4.5 ★★★★★ 410 reviews
Public park with a playground, pool, and picnic tables, plus softball and baseball fields.
Summitridge Park
4.6 ★★★★★ 279 reviews
Community park providing open grassy lawns, picnic space & a hillside hiking trail with city views.
Sycamore Canyon Park Trail
4.7 ★★★★★ 238 reviews
Neighborhood hiking trail with a steep staircase, outdoor exercise stations & scenic views.
Heritage Park
4.5 ★★★★★ 230 reviews
Small park featuring a baseball diamond, picnic tables, playgrounds, swings.
Summitridge Trail
4.7 ★★★★★ 138 reviews
Hiking area known for a dog-friendly trail that's long and has some steep inclines.
Pantera Park Trail
4.7 ★★★★★ 46 reviews
Area featuring kid-friendly hikes, a dog park, and basketball.
No trails match those filters.
How to pick a trail in Diamond Bar
- Match the surface to your legs. Asphalt and concrete are fast, predictable and runnable year-round but the least forgiving; crushed limestone and dirt take the sting out of high mileage; boardwalk is flat and scenic but slick in the wet. If your shins or knees are complaining, the fix that actually works is varying the surface you run on rather than chasing one "best" one.
- Loop or out-and-back? 3 trails here are loops, so you finish back at the car with no backtracking — the easiest way to run a set distance without thinking about it. On an out-and-back you turn round at half your target distance, which makes any trail fit any run. The longest stated distance in Diamond Bar is Summitridge Trail at 1.5 mi.
- Check the hours before a 6am run. 1 trail in Diamond Bar is open 24 hours — the rest can sit inside a park that gates at dusk and doesn't unlock until well after sunrise. 7 of the 8 listings carry posted opening hours — worth a look before you set an alarm. 3 are lit, which is what you want for winter evenings.
- Long run? Check water and restrooms first. 7 have trailhead parking, 6 have restrooms, and 4 have a water fountain in Diamond Bar. Anything over an hour and those stop being nice-to-haves — and in summer, shade counts double.
- The small things that decide it. 5 shaded, 1 with mile markers, 5 that runners describe as quiet, 3 dog-friendly, and 2 smooth and wide enough for a stroller or a wheelchair. Busy or quiet isn't a good-or-bad thing here: a busy path is the safer choice for a solo run at dawn, a quiet one is better for intervals.
More on all of this in the trail-running guides.
Browse Diamond Bar trails by type
Running trails near Diamond Bar
Worth the short drive — the closest towns with trails in the directory.