Out-of-season flower

There is one marigold in bloom in the churchyard at Broadway and Isham Streets. What's noteworthy is that this isn't the last of a batch that were transplanted into the garden months ago: it's a single volunteer plant. I've been watching the closed bud for the past couple of weeks, and a few days ago had concluded that it wasn't going to flower. (It's been chilly lately, and we've seen frost on the lawn across the street.)

This morning, we were walking back from the drugstore and saw it. One small flower, a few inches above the ground, and facing sideways rather than turned up toward the sun. I'm guessing it opened a day or two ago.