Cactus Impactus commands attention on the Lower Slab formation in Old Castle, offering a compelling trad climb that stretches across 200 feet of varied terrain. The route traces a wandering line that follows the natural features carved into the wall, inviting climbers to move methodically from one solid hold to the next. As you ascend, the rock reveals itself—firm and textured, it leans into your grip with steady promise. The climb’s defining challenge isn’t just the physical moves but navigating the living obstacles: scattered clusters of cacti cling to some ledges, daring you to avoid their stubborn spines while you negotiate tricky stances. This element adds an engaging layer of caution and focus, transforming the climb into a full sensory challenge.

Situated in the greater San Diego County landscape, this route offers a compelling blend of exposure and natural beauty. The slab’s angle allows clear, bright sunlight for much of the day, with shifting shadows that mark the passing hours and hint at the approach of evening. For trad climbers seeking a moderate 5.9 challenge, Cactus Impactus delivers solid protection with gear placements up to three inches, requiring a well-rounded rack but no overly large pieces. The anchor setup is straightforward and secure, easing any worries about the descent. The route's lengthy traverse character encourages climbers to stay mentally sharp; the sequence flows, but complacency means a prick from nearby cacti might come swiftly.

Planning your climb here involves more than just hardware. The access to Old Castle is straightforward but demands attention to desert heat and exposure, especially in the summer months. A steady supply of hydration and sun protection transforms the experience, letting you focus fully on movement and route reading. Footwear with sticky rubber and confidence on slab terrain make all the difference as the rock’s texture invites precise smearing and delicate foot placement. Beginners stepping up to 5.9 will find this route a rewarding test—long enough to stretch your endurance and technical ability, but manageable in a single pitch.

Whether you arrive early for cool morning conditions or late afternoon for golden light bathing the sloping walls, the route’s location in North San Diego County offers a rewarding playground. The wider area is notable for its spacious feel and relatively uncrowded lines, granting a chance to engage deeply with the climb itself without distraction. The climb finishes on a ledge clear of the spiny plants below, where climbers can relax and take in the south-facing views before descending. For those ready to embrace a classic trad adventure with a desert twist, Cactus Impactus strikes a fine balance between excitement and careful navigation—offering a route that stays in your mind long after the final clip.