Summer appears to have had its last hurrah, and the proof is the first frost forecast for this weekend. Sign.

WISN 12  News Meteorologist Mark Baden posted on Twitter Tuesday night that eastern Racine County is on course for some patchy fog Saturday night into Sunday morning.

The news station’s weather blog indicates the area is on pretty much on schedule for its first frost: sometime between Oct. 11 and Oct. 20.

After the cool down, though, temperatures could be on a short upward swing before the end of the month, the post continues.