Warren wrote:

.....At this time you want to fertilize with a "winterizer"-type fertilizer.
Scotts is fine. Relatively expensive, but fine. You want a low nitrogen
fertilizer at this time. Your goal is to build healthy roots, not
necessarily a lot of green on top........

You want a HIGH NITROGEN fertilizer at this time. Cool season grass
needs lots of N in October and November to build roots and to store
carbohydrates for the winter.

This myth about fertilizing in spring has ruined more than a few lawns.