6.2 km
~1 hrs 45 min
311 m
"An epic challenge to remember from the heart of Alameda County"
The Hayfield Road and Flag Hill Loop Trail is a 6.2 km looped trail that starts and ends in Sunol, Alameda County, California. Based on our data, the trail is graded as Difficult. For information on how we grade trails, please read measuring the difficulty of a hiking trail on hiiker. Also, check our latest community posts for trail updates.
This trail can be completed in approx 2 hrs 23 mins. Caution is advised on trail times as this depends on multiple variables. For more info read about how we calculate hike time.
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