There are just a couple of weeks left for Half Dome hiking; the park trail crew de-rigs the cables for winter afer Columbus Day weekend. An overnight backpacking Wilderness permit or a Half Dome day-hiking permit is required for any hiking ascent to the summit. There’s a lot of demand for a small number of permits; get these via nps.gov/yose or recreation.gov. This is a very strenuous, 17-mile round-trip hike with a 4800′ ascent, climaxing with the steep cable route to the top of the 8800′ granite summit. Shorter daylight (definitely bring a headlamp) and possible storms make October a challenging time to try Half Dome. The cable system is usually re-installed by late May.