A small fire at Red Rocks caused crews to close the entrances to the park the night of a concert.

KUSA — An approximately one-and-a-half-acre grass fire that started burning at Red Rocks Friday afternoon is out, according to West Metro Fire.

As of around 5 p.m., crews were still in the process of mopping up the blaze.

Lightning-caused fire at Red Rocks. Approximately one and a half acres. Fire is out, our crews are mopping up. The entrances to Red Rocks Amphitheatre are now back open. pic.twitter.com/MB4JUog0Lt — WestMetroFire (@WestMetroFire) August 31, 2018

The fire briefly closed the entrances to Red Rocks, but they are now back open.