It is a landmark to reach the 20 year mark and Stone Brewing has ridden the IPA wave all the way to this plateau. Ostensibly, this year will be focused on their Citracado DIPA which honors the parkway that they live on as well as the Citra hop and (avo)cado honey ingredients used in the new anniversary brew.
But they have added a wrinkle and are re-brewing some the milestone Stone Anniversary Ales from the past — 5th Anniversary IPA, 10th Anniversary IPA and the rogue 15th Anniversary Escondidian Imperial Black IPA which will make up a variety pack.
Hopefully no one was cellaring those beers for a mega-anniversary tasting. The 20th should be available shortly and the 4-pack will arrive in mid-September.