Mount Islip

{{Short description|Mountain in California, U.S.}}

{{Use mdy dates|date=January 2025}}

{{Infobox mountain

| name = Mount Islip

| photo = Mount-Islip.jpg

| photo_caption = Mount Islip from the trail to the top

| elevation = {{convert|8250|ft|0|abbr=on}}

| elevation_ref = {{NAVD88}}{{cite ngs |id=EV9281 |name=Crystal Lake H 7A |accessdate=2009-08-10}}

| prominence_ft = 662

| prominence_ref = {{cite pb|name=Mount Islip|pid=1320}}

| listing = Hundred Peaks Section{{cite hps |id=14C |name=Mount Islip |accessdate=2009-08-11}}

| location = Los Angeles County, California, U.S.

| map = California#USA

| map_caption = Location in California

| map_size = 240

| label_position = below

| range = San Gabriel Mountains

| coordinates = {{coord|34.345009297|N|117.839936208|W|type:mountain_region:US-CA_scale:100000_source:NGS|format=dms|display=inline,title}}

| range_coordinates =

| coordinates_ref =

| topo = USGS Crystal Lake

| type =

| age =

| first_ascent =

| easiest_route = Trail hike, {{YDS|1}}{{cite summitpost |id=362207 |name=Mount Islip |accessdate=2011-05-07}}

}}

Mount Islip ({{IPAc-en|ˈ|aɪ|s|l|ɪ|p}} {{respell|EYE|slip}}) is a {{convert|8250|ft|0|adj=on}} peak in the Angeles National Forest in California, United States. On a clear day the sharp, high peak provides impressive views of the Mojave Desert, the Los Angeles Basin, Santa Catalina Island, and San Clemente Island.{{cite web | url = http://www.fs.fed.us/r5/angeles/recreation/hike-islipsad2littlejimmy-mtislip.shtml | archiveurl = https://web.archive.org/web/20090814122052/http://www.fs.fed.us/r5/angeles/recreation/hike-islipsad2littlejimmy-mtislip.shtml | archivedate = 2009-08-14 | title = Islip Saddle to Little Jimmy and Mount Islip | publisher = U.S. Forest Service | accessdate = 2009-08-11 }}

The peak is named for George Islip, a homesteader who lived in the surrounding area during the late 19th century.{{Cite web |title=HPS Summit Signatures - Mount Islip |url=https://hundredpeaks.org/signatures/14c.htm |access-date=2024-10-14 |website=hundredpeaks.org}} It was once home to a steel fire lookout tower that was built in 1927.{{Cite news |date=1927-09-17 |title=Islip |url=https://www.newspapers.com/article/the-register-islip/33789432/ |access-date=2024-10-14 |work=The Register |pages=1}} A remnant of the lookout site, a rock cabin, remains near the summit to this day.

A trailhead for climbing Mount Islip is located at Islip Saddle, along the Angeles Crest Highway, approximately {{convert|53|mi|km|0}} northeast of downtown Los Angeles. Another trailhead is at the Crystal Lake Recreation Area, north of Azusa.{{Cite web|url=https://hikingguy.com/hiking-trails/best-la-hikes/hike-mt-islip-from-crystal-lake/|title=Hike Mt Islip From Crystal Lake (2019)|date=2019-10-26|website=HikingGuy.com|language=en|access-date=2019-10-26}}