JMT South of Devils Postpile: Fall Permit Window Before the Snow Flies

This entry point drops you straight into the crossroads of the John Muir Wilderness and Ansel Adams Wilderness, right off the JMT corridor near Devils Postpile. Come early October, you're in the last real window before Sierra weather gets unpredictable and access roads start winding down for the season. Permits run through Recreation.gov as a reservation system, not a walk-up lottery. Book as early as you can once your dates are set — this zone feeds some of the most popular JMT and PCT mileage in the state, and even in shoulder season slots can go fast on weekends. Weekday entries in early October are your best shot at flexibility. Fall conditions here are a mixed bag. Days can still be warm and clear, but nights drop hard, and an early storm can drop snow above 9,000 feet with little warning. Check the forecast right up until your departure day, not just when you book. If you see a storm system lining up, have a bailout plan and know your exit points along the JMT corridor. Water sources along this stretch aren't mapped in detail here, so treat every creek and lake as unconfirmed until you're standing at it. Fall flows are lower than summer, and some smaller seasonal creeks may already be trickling or dry. Carry more capacity than you think you need and filter or treat everything. Bear canisters are required, not optional, through this whole zone — John Muir Wilderness and Ansel Adams Wilderness are both hard canister country. The rule holds essentially year-round in most of this terrain, and it's mandatory above 9,600 feet even where lower-elevation exceptions might apply elsewhere. There are no bear boxes at camps out here, so your canister is your only line of defense. Rent or buy one before you leave the trailhead — rangers do check. Itinerary-wise, this is JMT-adjacent terrain, so expect classic Sierra high country: granite benches, alpine lakes, and long sightlines once you clear timberline. Days are short in October, so plan your camp mileage with a couple hours of buffer before dark and start early. Don't count on making up time at altitude with less daylight to work with. Common mistakes in this window: underestimating how cold it gets once the sun drops, showing up without a canister and hoping campground gear rental covers it, and not checking whether the Devils Postpile access road and shuttle setup are still running before you drive up. Roads and shuttle service in this area typically wind down as fall progresses, so confirm current status before you commit to a specific arrival time. Crowds thin out compared to peak summer, but this is still JMT territory — don't expect solitude, especially near junction points and popular lake basins. Expect to share camps with a mix of JMT thru-hikers finishing their season and shorter loop hikers grabbing the last good weather window. — Compiled by the PermitSnag team from agency info, ranger updates, and public trip logs.