Can you offer an antifreeze mode that does 1min spirts from each selected zone when the temperatures in an area near freezing?
@RPS - many communities (like the one I live in) have regulations prohibiting watering during freezing weather due to the potential for ice on the sidewalks or streets. If that is not an issue for you, then using IFTTT you may be able to set something up that will work for one cycle - not necessarily continual one minute spurts and not sure you’d want that effect for a long cold spell.
Sidewalks could be a reason RachIO would need to make it zone selectable (maybe include a safety warning) but offering would help save sprinkler valves in CA. -R