Main Trail - Boyce Thompson Arboretum

Nestled near Pinal County, Arizona, the Main Trail at Boyce Thompson Arboretum offers a delightful 2 km (1.2 miles) loop with virtually no elevation gain, making it accessible for a wide range of hikers. This trail is estimated to be of medium difficulty, providing a perfect blend of natural beauty and mild physical challenge.

### Getting There To reach the trailhead, you can drive or use public transportation. If driving, head towards Boyce Thompson Arboretum, located at 37615 E Arboretum Way, Superior, AZ 85173. For those using public transport, the nearest major city is Phoenix. From Phoenix, you can take a bus to Superior, Arizona, and then a short taxi ride to the arboretum.

### Trail Highlights As you embark on this loop trail, you'll be greeted by a diverse array of plant species, many of which are native to the Sonoran Desert. The arboretum is renowned for its extensive collection of desert flora, including towering saguaro cacti, vibrant wildflowers, and various types of agave.

### Significant Landmarks Approximately 0.5 km (0.3 miles) into the hike, you'll encounter the historic Smith Building. This structure dates back to the early 20th century and serves as a reminder of the arboretum's rich history. The building was originally constructed by William Boyce Thompson, a mining magnate and philanthropist who founded the arboretum in 1924.

Continuing along the trail, around the 1 km (0.6 miles) mark, you'll come across the serene Ayer Lake. This man-made lake is a haven for birdwatchers, offering sightings of various species such as herons, ducks, and even the occasional bald eagle. The lake is also surrounded by lush vegetation, providing a stark contrast to the arid desert landscape.

### Flora and Fauna The trail is a botanical treasure trove, featuring over 3,900 different plant species. Keep an eye out for the rare and endangered Arizona hedgehog cactus, which blooms with stunning magenta flowers in the spring. The arboretum is also home to a variety of wildlife, including lizards, snakes, and small mammals like the desert cottontail rabbit.

### Navigation For navigation, it's highly recommended to use the HiiKER app, which provides detailed maps and real-time updates to ensure you stay on track. The trail is well-marked, but having a reliable navigation tool can enhance your hiking experience.

### Historical Significance The Boyce Thompson Arboretum is not just a botanical garden but also a site of historical importance. Established in 1924, it was one of the first botanical institutions in the American Southwest. The arboretum was created to foster an understanding and appreciation of desert plants and their ecosystems. William Boyce Thompson's vision was to create a living laboratory where scientists could study desert flora and educate the public about the importance of plant conservation.

### Practical Tips Given the desert environment, it's crucial to bring plenty of water, wear sun protection, and dress in layers to accommodate temperature fluctuations. The trail is open year-round, but the best times to visit are during the cooler months from October to April.

This 2 km (1.2 miles) loop offers a unique blend of natural beauty, historical landmarks, and educational opportunities, making it a must-visit for anyone interested in the flora and fauna of the Sonoran Desert.