Best Fall Long Days Hikes in Los Angeles
Fall is the prime season for tackling Los Angeles's longest and most demanding trails. Temperatures drop out of the brutal summer range, rattlesnake activity fades, and the marine layer gives way to some of the clearest skies of the year. Whether you're chasing ridge-top panoramas in the San Gabriel Mountains or logging serious mileage through the Santa Monica range, October through early December offers ideal conditions for all-day efforts.
Top 8 long days hikes for fall
The full out-and-back from Manker Flat to the 10,064-foot summit is approximately 9 to 10 miles round trip with serious elevation gain. Fall brings crisp visibility stretching to the Pacific and first dustings of snow on the upper ridges.
Southern California's highest peak demands approximately 18 to 20 miles round trip and should be treated as a full commitment day. Cool fall air makes the sustained climb through lodgepole pine forest significantly more manageable than summer attempts.
This high-country loop in the San Gabriel Wilderness links two named summits for roughly 8 to 10 miles of ridge travel. Fall color from scattered aspen groves adds visual reward to already sweeping views toward the Mojave.
Running the full eastern Backbone segment from Trippet Ranch to Malibu Creek covers approximately 13 to 16 miles one way and benefits from a car shuttle. Coastal sycamores turn gold in late October, and crowds thin compared to spring weekends.
Connecting the Eaton Canyon drainage to the Mt. Wilson summit via the Chantry Flat approach creates a demanding approximately 14 to 16 mile day. Cooler fall temperatures make the prolonged exposed ridgeline section far more comfortable.
This approximately 8 to 10 mile loop in the front range of the San Gabriels traverses mixed chaparral and oak woodland that shows subtle fall color. The scramble to Strawberry's summit block rewards hikers with a 360-degree view across the LA basin.
The PCT traverse across Liebre Mountain in the Angeles National Forest offers a remote approximately 12 to 14 mile out-and-back with minimal crowds. Bigcone Douglas fir and chamise blanket the slopes, and fall fog inversions frequently fill the Antelope Valley below.
The Icehouse Canyon approach to Cucamonga Peak is approximately 12 miles round trip and passes through one of the most intact canyon habitats in the front range. Bigleaf maples and alders along the creek floor are reliably colorful by late October.
Why Fall Is the Best Season for Long-Day Hikes in Los Angeles.
Summer heat makes any hike over 10 miles in the greater LA area a logistical challenge requiring 3 AM starts and heroic hydration. Fall solves both problems at once. By mid-October, high temperatures in the San Gabriel foothills regularly drop into the 70s, and ridgelines above 6,000 feet often stay in the 50s and 60s through midday. Lower humidity cuts the perceived effort on sustained climbs, and the absence of summer afternoon thunderstorm risk — common on high San Gabriel peaks — means you can push deeper into the day without watching the sky. Fire season also begins to wind down, reopening trail corridors that may have been closed for months. The combination of tolerable temperatures, clear air, and reopened terrain makes October and November the most productive months on the calendar for hikers who want to accumulate genuine mileage.
Gear and Logistics for All-Day Efforts in the San Gabriels.
Long-day hikes in the Los Angeles backcountry require a different gear calculus than typical 5-mile morning outings. A 2- to 3-liter water capacity is a minimum; on trails above 8,000 feet with a water source, a filter lets you stretch that further without extra weight. Traction devices — microspikes or light crampons — belong in your pack from late October onward on any route that tops 9,000 feet, as early-season snow can appear on north-facing slopes. Navigation offline maps downloaded before you leave the trailhead are non-negotiable on longer routes where cell signal is spotty. A lightweight emergency bivy or space blanket adds minimal weight but becomes critical if an injury, unexpected weather, or navigation error extends your day past sunset. Tell someone your specific route and expected return time.
Permit and Access Considerations for Fall Hikes Near LA.
Several long-route trailheads in the Los Angeles area require an Adventure Pass or America the Beautiful pass for parking, including most Angeles National Forest lots. San Gorgonio Wilderness requires a wilderness permit for day hikes, which can be reserved through the appropriate national forest reservation system — demand is lower in fall than summer but advance booking is still advisable for popular weekends. The Backbone Trail in the Santa Monica Mountains National Recreation Area is generally permit-free, but the Chantry Flat trailhead in the San Gabriels fills by 7 AM on fall weekends and overflows onto the narrow approach road. Arriving before dawn or carpooling with your group eliminates most parking headaches and also gets you on-trail at the optimal time for all-day objectives.
Safety on Remote Long-Day Routes in Southern California Fall.
Fall hiking in the Los Angeles backcountry carries specific hazards that shorter spring and summer hikes often don't expose. Post-fire terrain — slopes burned in recent years — can produce unexpected rockfall and unstable footing, particularly after early-season rain softens ash-compacted soils. Water sources that appear reliable on older maps may be seasonal and dry by October; verify current conditions on trail reports before depending on a mid-route refill. Longer routes also increase the statistical chance that someone in your party will need to slow down or turn back, which is why hiking with at least two other people is smart rather than optional on full-day efforts. A group of three or more means nobody waits alone if a member needs to descend, and shared gear weight keeps every person's pack manageable across the whole day.
Planning tips
- Start before sunrise on trails exceeding 14 miles — fall daylight runs roughly 11 to 12 hours and high-country trails move slower than their mileage suggests.
- Layer aggressively: San Gabriel ridges above 7,000 feet can drop below freezing by early November, and afternoon wind on exposed summits compounds the chill significantly.
- Carry a paper or offline map in addition to your phone — fall is peak wildfire recovery season in the Angeles, and trail reroutes or temporary closures can appear with little advance notice.
- Check current fire-closure status on the Angeles National Forest and Santa Monica Mountains websites the morning of your hike, as boundaries can shift week to week in fall.
- Fuel with calorie-dense snacks rather than relying on a single large meal — sustained 8-plus hour efforts in cool air burn through energy reserves faster than summer day hikes where heat suppresses appetite.
Hike a TrailMates group event this fall
TrailMates makes finding partners for serious long-day hikes in Los Angeles straightforward — filter by pace, distance comfort, and availability, then coordinate your fall objective as a group. Download TrailMates to plan your next all-day San Gabriel or Santa Monica Mountains adventure with people who are ready to move.