American craft seasonal beers and special release beers are the gems of the brewing world. The Brewers Association’s new web site is dedicated to seasonal beer releases.
Seasonalbeerandfood.org is unique. All postings come directly from the breweries themselves.
According to recent industry data seasonal beers are the top selling "style" of craft beer from craft brewers. They come and go with the season, available for limited time. Some are cyclical, but they can also be one-time special releases. More often than not, their focus is on seasonal ingredients, highlighting flavors harmonizing with the faire of the moment.
Hard to find information about special beers can be found at seasonalbeerandfood.org, also searchable by state and season. Currently there are close to 400 postings to the site.
As a bonus brewery suggestions on what food to pair their seasonal specialties with are included.