What are some good forsythia varieties for Iowa?

FAQ
Question: 

What are some good forsythia varieties for Iowa?

Answer: 

When selecting a forsythia, choose a cultivar that reliably blooms in Iowa. The flower buds on some varieties are not reliably cold hardy in Iowa. For example, ‘Lynwood Gold’ and ‘Spring Glory,’ typically don’t bloom well in Iowa as their flower buds are often killed by cold winter temperatures.

Forsythia varieties that grow well and bloom reliably in Iowa include ‘Meadowlark’ (bright yellow flowers, grows 8 to 10 feet tall, has arching spreading form), ‘Northern Sun’ (medium yellow flowers, grows 8 to 10 feet tall, has arching spreading form, University of Minnesota introduction), ‘Sunrise’ (medium yellow flowers, grows 5 to 6 feet tall, dense growth habit, an Iowa State University introduction), and ‘Northern Gold’ (yellow gold flowers, grows 8 to 10 feet tall).