Flag Hill Loop Trail

HARD 52 reviews
#6 of 22 trails in

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

DISTANCE
3.9 miles
ELEVATION GAIN
994 feet
ROUTE TYPE
Loop

dog friendly

birding

hiking

nature trips

trail running

walking

forest

views

wild flowers

wildlife

scramble

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.

hiking
1 month ago

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.

2 months ago

This is a beautiful trail specially in spring, the whole area transforms completely. Have done this both in summer and spring and lived 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.

hiking
3 months ago

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.

hiking
7 months ago

Great hike and less traffic!

8 months ago

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.

hiking
11 months ago

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)

hiking
Wednesday, July 26, 2017

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.

hiking
Friday, July 21, 2017

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

Monday, June 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.

hiking
Sunday, May 07, 2017

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

hiking
Sunday, April 02, 2017

Such a beautiful trail! Spring is my favorite time to visit Sunol! This loop is difficult, but the views are worth the sweat! BRING SUNSCREEN AND PLENTY OF WATER! There are cows on this reserve, do not pet the cows! The mommas get very testy! Cows are not aggressive by nature, but will charge is they feel threatened or you get too close to their babies!

hiking
Saturday, December 24, 2016

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.

Friday, March 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.

Tuesday, December 03, 2013

dutch oven reviews

Friday, October 11, 2013

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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