Forsythia leaves turned reddish brown
Thanks for your question about your forsythia. The leaves on your plant look really healthy: no brown spots, no curling or falling off. It could just be your plant's reaction to our weather this year, but no cause for alarm. I found this in an Extension article on forsythias:
"Fall leaf color is usually poor. Occasionally, however, leaves may turn pale yellow to reddish purple in fall."
So, just enjoy!