I live on Long Island, NY zone 7 and purchased this forsythia a couple of yrs. ago. Much to my surprise, this shrub rebloomed last Fall, as well as, this Fall. As noted in the photos, the green leaves turned a burgundy like color. Is anyone familiar with this variety and do you know it's name? Thanks in advance.

Most garden forms of Forsythia are cultivars of Forsythia × intermedia, but some differ mostly in mature size and growth habit, and difficult to tell which one from your photos and the age of your plant. However it isn't uncommon for them to bloom in the fall. They set buds for next spring at the end of summer, and require only a short chill period to vernalize them. Brief warming trends in late autumn and winter often stimulate them to produce some blooms. Typically mine still reserve enough buds to open in spring and put on a nice display, but there have been years they have finished blooming before spring even arrived.

It seems to me that certain forsythia are consistent fall bloomers. I've noticed that shrubs planted out in full sun seem to do this more often than shrubs planted in shaded or partially shaded (or in a hedge). I dont think there's a specific "strain" of forsythia that fall bloom; I think it's more likely a combination of environmental factors.

Thank you Neal and Annie for your quick reply. I am sorry I could not capture a better photo of this shrub. It was camouflaged due to the falling leaves and surrounding shrubs. Before contacting you, I did find one article referring to reblooming forsythia as follows:
www.paghat.com/forsythia.html
I do believe you evaluation is correct that the rebloom was trigger by a sudden change in temperature. There were only a scant amount of flowers so hopefully come this Spring the flowers will be abundant. Again, thank you for your time and expertise.