Just beyond the borders of San Luis Obispo lies Reservoir Canyon, a sprawling 487-acre open space that feels genuinely remote despite being just a mile past the city limits. The main draw here is the waterfall—the largest in all of SLO County—and reaching it makes for a satisfying 3-mile round trip hike with your dog on-leash.

The trail starts out mellow, which is nice because it lets you ease into things. But don’t get too comfortable: after the initial gentle stretch, the path kicks up noticeably as you climb a substantial hill. The elevation gain tops out around 1,100 feet total, and the moderate-to-difficult rating is accurate. You’re looking at about 2.5 to 3 hours for the full hike, depending on your pace and how long you linger at the top.

What makes the effort worthwhile is the payoff. Once you crest that hill, you get genuinely impressive views back over San Luis Obispo—the kind of vista that makes you understand why people settled in this valley. The waterfall itself is particularly rewarding in spring and early summer when water flow is strongest. There’s also a swing tucked near the summit that’s worth finding; it’s become a bit of a landmark for people hiking through here.

The terrain is a mix of chaparral and oak woodland, so bring plenty of water for both you and your dog. The trail can get warm and exposed in spots, especially mid-day. The full canyon covers 6.4 miles of trails if you want to explore more thoroughly, but the waterfall route is the main attraction.

To get there, take Highway 101 north out of San Luis Obispo and drive about a mile past the city limits. Turn right onto Reservoir Canyon Road—it’s the second road past City Limits—and follow it to the trailhead parking area where the road ends.