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Flag Hill Loop Trail [CLOSED] is a 3.9 mile moderately trafficked loop trail located near Sunol, California that features beautiful wild flowers and is rated as moderate. The trail offers a number of activity options and is accessible year-round. Dogs are also able to use this trail.

Length 3.9 mi Elevation gain 994 ft Route type Loop
Dog friendly Hiking Nature trips Walking Bird watching Running Forest Views Wild flowers Wildlife Closed
Description
Waypoints (5)
Contact
Tips

Due to active wildfire, this area is CLOSED to public access as of August 2020. Reopens when declared safe by the Fire Department. A short, steep hike up Flag Hill promises grand scenery and offers a great way to introduce your kids to hiking. Sunol Regional Wilderness is one of the best hiking locales in the East Bay hills northeast of Silicon Valley. This Flag Hill Loop is one of the best ways to see Sunol. This loop is relatively short, but it's no cakewalk: Flag Hill summit is 1.3 miles and 900 feet above the Sunol headquarters. It's a tough climb, but it's over soon enough to suit youngsters' short attention spans. The view from the top is one of the best in the Bay Area, well worth the climb. In springtime, the hills are popping with California poppies and many more wildflowers. Once you've soaked up the view from Flag Hill, it's all downhill back to the park headquarters.

Sunol Wilderness page, East Bay Regional Parks http://www.ebparks.org/parks/sunol

Use extreme caution on the rocks at the Flag Hill summit -- a fall could be fatal. Watch for poison oak on narrow sections of trail. There will be cattle at Sunol -- give them plenty of distance. What to bring: Water Sunscreen Camera Map from the park HQ

Weather
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Reviews (91)
Photos (984)
Recordings (98)
Completed (220)
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Jerry Hom
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJuly 1, 2020
HikingNo shadeRocky

Great moderate hike, good views from the top. Very little shade. Steep decline on narrow path if you go counterclockwise.

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Helena Arterburn
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarMarch 25, 2020
HikingMuddy

Very very muddy all the way up and down! Beautiful day! Lots of cows with their young. We got chased by one protecting her calf.

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Jeff Francis
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 17, 2020
Hiking

Flag hill is a great place to start with sunol. Once you hit the top, you have a great view and a spot to sit and hydrate and have a snack. Its awesome to be above the birds. This is also a great hike to prepare for hikes like half dome. The last half ish mile of climbing flad hill is a good leg workout. Dont stop at this loop though. Look at your map and add a few more trails to it. Sunol is the best area around for a good butt kicking hike! Just watch out for those dang cows. They will charge you. STAY CLEAR OF THE COWS!

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Ricardo Soto
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarNovember 3, 2019
HikingBugsNo shade
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Pacitiko Cho
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarOctober 18, 2019
Hiking

only went to the cliffs of flag hill. good hike but its pretty exposed.

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Denise Borgeson
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarAugust 2, 2019
HikingNo shade
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Satya G
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Hiking

We went in Labor Day weekend, it was decent hike. A bit difficult at start but then you get to see beautiful views and it is downhill from the summit. It was dry in Sep, will try once more in Spring as well. It took us around 1.5 hrs to complete the loop.

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Satish Singh
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJuly 16, 2018

This is a beautiful trail specially in spring, the whole area transforms completely. Have done this both in summer and spring and liked it very much. The trail can be attempted via uphill route or a easier route passing a old barn. The distance is not much but it’s very rewarding and satisfying feeling if you use the uphill route.

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Anand Verma
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJuly 8, 2018
Hiking

Not as hard as I expected however there is about half a mile of rugged trail during the climb that challenges you. Good fun for a short day hike. Downhill is mostly cattle track so it gets a little bit monotonous. Also keep in mind that shades are very scarce so make sure you prepare yourself for that. A nice little shade is built near a shed while going downhill that is a great of spot to take a quick break. It also has a water fountain.

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Sunil Dhital
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarFebruary 20, 2018
Hiking

Great hike and less traffic!

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Kea Pup
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarFebruary 4, 2018

great scenery, however, be careful of cows during calving season (spring). we got chased by a mother even though we were trying to walk around the calves who were on the trail.

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Melissa Bratman
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarNovember 6, 2017
Hiking

I love this hike and have been on it a few times. I would consider it to be moderate (difficult trails, to me, involve climbing over rocks or trails with sheer drops) It’s best to go in the spring or fall when the weather is not got, as the trail does not provide any shade. There are some pretty amazing vistas, especially in the early mornings worth the clouds/fog. There’s a ton of nature to see, including turkeys, ground squirrels, turtles, deer, quail, hawks, and especially cows, which you can walk right alongside. Keep in mind that as great as it is to be so close to the cows, that also means lots of “mud pies” everywhere you step along the trails. I recommend starting up the Flagstaff trail early in the morning and then stopping by the pond for a break, and heading down via the Indian Joe Creek trail. The hike takes about 2.5-3 hours Other things to note: There’s a $5 cash only entrance fee. Also the restrooms are not great, so I recommend stopping elsewhere beforehand (eg Sunol super stop)

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Vishal Arora
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarJuly 26, 2017
Hiking

Beautiful trail. Bring your hiking sticks. Go early like 6am. There are two ways to start this loop. I started from Flag Hill Trail and returned via Hayfield road.

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Aka-iro Kame
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJuly 21, 2017
Hiking

I recommend start hiking in the morning. Not much of shades so it will get super hot.

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Nitin Gaur
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJune 12, 2017

Rocky hike to the summit, but worth for its views. Park hours are 8am to 9 pm, so come early to get the parking spot near the visitor center. So don't have to walk on road to trail starting point.

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Awanderlustlife Dentso
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarMay 7, 2017
Hiking

Easy hike, amazing view, dog friendly, and surrounded by beautiful nature.

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Madison Hirsch
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarDecember 24, 2016
Hiking

Such an amazing hike!! I went out with my dog and it was a lot of fun. There are a bunch of different trails in this area. The only thing is that it rained a lot yesterday so the trails were still pretty muddy. It was quiet, peaceful, and beautiful. I definitely recommend this hike if you are in the area.

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Joost Schreve
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarMarch 13, 2015

Hiked this loop today with 6 kids and 3 adults. Kids in the age group 5 - 9 all made a without too much trouble. We even carried our 2 month old up with us as well. It's a beautiful hike, quite steep uphill, with spectacular views. One of my favorite hikes in the Bay Area now.

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AllTrails User
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dutch oven reviews

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AllTrails User
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarOctober 11, 2013
First to Review

In springtime, the hills are popping with California poppies and many more wildflowers. Once you've soaked up the view from Flag Hill, it's all downhill back to the park headquarters. Tips: Use extreme caution on the rocks at the Flag Hill summit -- a fall could be fatal. Watch for poison oak on narrow sections of trail. There will be cattle at Sunol -- give them plenty of distance. What to bring: Water Sunscreen Camera Map from the park HQ

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Samantha Conner
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarAugust 13, 2020
Hiking
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yasu akita
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Hiking
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Gaby McVay
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Hiking
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Vidya Mane
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Hiking
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Mark Solloway
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Hiking
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Lynne Vb
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Hiking
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David Parman
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Hiking
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William Clark
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Hiking
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Showing results 1 - 28 of 91