Ahmanson Ranch House and Mary Wiesbrock Loop Trail

You can typically find parking at the Victory Trailhead, which serves as a common starting point for this route within the Upper Las Virgenes Canyon Open Space Preserve.

The Ahmanson Ranch House and Mary Wiesbrock Loop Trail is generally rated as easy. While there are some moderate climbs and sections that can be rutted or loose, it's largely accessible for most hikers. Some downhill singletrack parts might be challenging for beginners, especially if shared with mountain bikers.

The trail primarily follows dirt roads, with some segments transitioning to singletrack. You'll encounter varied surfaces, including firm ground, but also areas with ruts, small steps, and potentially loose or dusty sections on steeper inclines. Be prepared for very muddy conditions if you visit after rainfall.

Hikers are treated to expansive views of the Santa Monica Mountains, the San Fernando Valley, and Las Virgenes Canyon. The landscape features hillsides dotted with valley oak trees, and in spring, vibrant wildflowers and large stands of mustard. You'll also traverse grassy riparian areas and ascend to Lasky Mesa. The Mary Weisbrock Loop Trail itself is a key feature.

While specific rules for this exact trail aren't detailed, dogs are generally permitted on leash in the Upper Las Virgenes Canyon Open Space Preserve. It's always a good idea to check the official Los Angeles County Parks and Recreation website for the most current regulations regarding pets before your visit.

Spring is an excellent time to visit, as the hillsides burst with wildflowers. Fall and winter offer cooler temperatures, making for more comfortable hiking. Be aware that the trail can become very muddy after rain, and summer months can bring high temperatures, so plan accordingly.

Generally, there are no entrance fees or permits required for day use of the Upper Las Virgenes Canyon Open Space Preserve. However, it's always wise to confirm current regulations on the official Los Angeles County Parks website: lacounty.gov.

The preserve is home to various wildlife. You might spot red-winged blackbirds and hawks soaring overhead. As with many natural areas in California, be mindful of potential encounters with rattlesnakes, especially during warmer months.

Yes, the route incorporates sections of several other trails within the preserve. You'll find yourself on parts of the Ahmanson Ranch House Trail, the Mary Wiesbrock Loop Trail, Dean's Loop, Joe Behar Trail, East Las Virgenes Canyon Trail, and Laskey Mesa Trail, among others.

The Mary Wiesbrock Loop is a tribute to Mary Wiesbrock, whose dedicated conservation efforts were instrumental in preventing a large development project on the 2,983-acre Ahmanson Ranch. Her work led to the preservation of this area as the Upper Las Virgenes Canyon Open Space Preserve, ensuring public access to its natural beauty.

The overall route, which is about 6.0 kilometers (approximately 3.7 miles), can typically be completed in around 1 hour and 23 minutes, depending on your pace and how often you stop to enjoy the scenery.