Mariscal Canyon Rim Professional Review and Guide
"The geography of Big Bend National Park offers hikes to the river, into canyons, through badlands, or up mountains. But nowhere in Big Bend can you experience such a magnificent blending of landscapes into one trip as you can by hiking to the rim of Mariscal Canyon. This hike combines rugged landscapes, distant panoramas, and wilderness solitude all in one.
From February through June this trail is closed to hiking because of peregrine falcons nesting along the canyon rim. Check at a ranger station for specific closure dates. Avoid hiking this route during the hot months of the year, often from as early as April to as late as October.There is no water or shade, and afternoon temperatures frequently exceed 100 degrees Fahrenheit.Also, use care near the sheer cliffs of the canyon rim at the end of the trail.The canyon walls drop 1,200 feet straight down to the river from the rim."