Master list of Austin riding groups and group rides Google Doc maintained by Jason u/JasonATXBS https://www.reddit.com/r/BikingATX/wiki/usefulresources/ 

Annual Rides to look out for:

• Fort Davis Cyclefest and hill climb 74 mile beautiful desert mountain loop with great support in September https://www.facebook.com/FortDavisCyclefest/ 

• Marfa 100k Out and back on a remote desert road with great views and hills in October

• Tour Das Hugel ~111miles ~11k feet of Austins best hills in November