I haven't had it this year, but many times during a mild fall I'll have forsythia and flowering quince get some blooms. It doesn't seem to do any harm to what happens in the spring.

Lori

Yeah, I get that every year on my forsythia. Sometimes they get blooms in midwinter during the briefest warm spell.

1 month later and they are still blooming,but only the ones that were blooming more then 30 days ago.Last week temperature
in early morning reached 34 F yet they in partial bloom.Not many blooms that is.

Ours still had it foliage and some blooms too up until last Sunday when we got 10 inches of snow. Now today, it's 68 degrees and supposed to drop to 35 over night. Crazy weather for sure.