As the winter weather takes over & the temperature plummeting down .. to ( below 40•F 
@ night ) copper pipes ( especially) can freeze and break open the lines ! Please winterize the Sprinklers using a Compressor @ 60 PSI pressure ( by Shutting the water line OFF) run open the Rachio zones using the App for about 4~5 times …! It will Clear the Standing water 
in those lines for the next season ! Ready to Start !
This Saves You (
).. About 
100~150 service using a Professional Irrigation Crews / Lawn Sprinkler Service men !
Being born a raised in AZ, such a foreign concept to me. 
AZ: No worries…
I threw together a web app to help winterize an irrigation system controlled by Rachio using an attached air compressor. It’ll cycle through your zones (with a wait time in between) for you. It runs entirely in your browser and does not send your data anywhere other than Rachio.
I suggest using this on a computer (not phone) which is set to not go to sleep. Feel free to submit issues / suggestions in the GitHub repo (preferred) or here, though I can’t promise I’ll be able to make updates very often.
Ok.. That’s cool!!! As I had already winterized it manually I ran it for a few cycles and it seems fine. Next year!!! Thanks for posting it.
