The once fast-moving blaze dubbed the Mission Fire was reported just after 1:30 p.m. near Mission and Andrade roads in Sunol and reached 50 acres quickly.
Video in the media player above is from a previous update
By 4:30 p.m. it was at 66 acres. Due to better mapping, Cal Fire now says the fire is 64 acres and holding steady.
There have been no injuries reported or damage to structures. Crews will remain through the night to gain full containment.
If you're on the ABC7 News app, click here to watch live