OpenStack的每个主版本系列以字母表顺序（A~Z）命名，以年份及当年内的排序做版本号，从第一版的Austin（2010.1）到目前最新的稳定版Icehouse（2014.4），共经历了9个主版本，第10版的Juno仍在开发中。

摘取自官方文档https://wiki.openstack.org/wiki/Releases，

Series Status Releases Date

Juno Under development Due Oct 16, 2014

Icehouse Current stable release, security-supported 2014.1 Apr 17, 2014

2014.1.1 Jun 9, 2014

Havana Security-supported 2013.2 Oct 17, 2013

2013.2.1 Dec 16, 2013

2013.2.2 Feb 13, 2014

2013.2.3 Apr 03, 2014

Grizzly EOL 2013.1 Apr 4, 2013

2013.1.1 May 9, 2013

2013.1.2 Jun 6, 2013

2013.1.3 Aug 8, 2013

2013.1.4 Oct 17, 2013

2013.1.5 Mar 20, 2014

Folsom EOL 2012.2 Sep 27, 2012

2012.2.1 Nov 29, 2012

2012.2.2 Dec 13, 2012

2012.2.3 Jan 31, 2013

2012.2.4 Apr 11, 2013

Essex EOL 2012.1 Apr 5, 2012

2012.1.1 Jun 22, 2012

2012.1.2 Aug 10, 2012

2012.1.3 Oct 12, 2012

Diablo EOL 2011.3 Sep 22, 2011

2011.3.1 Jan 19, 2012

Cactus Deprecated 2011.2 Apr 15, 2011

Bexar Deprecated 2011.1 Feb 3, 2011

Austin Deprecated 2010.1 Oct 21, 2010