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