Some put the actual date at September 15, but for many, Labor Day in the United States is the end of straw hat season. I for one will be retiring my James Lock boater for the season after this coming weekend.
Straw hats in general, and boaters in particular, make an elegant statement on the golf course when worn with trousers (shorts don't have the necessary gravitas). Although, when introducing one into a baseball cap wearing foursome for the first time, there can be criticism. I found that a straw fedora (what used to be called a jippa jappa) can help ease the way if worn a few times before the boater. And it helps still more if the wearer has enough game to win the Nassaus for front, back and round from any parvenus who lack an appreciation of classic style.