Is there a maximum distance my valves can be from my Rachio controller?

The short answer is yes. 

The longer answer is that it depends on the gauge of your sprinkler wire. For a quick reference on the maximum distance a valve can be from a controller, check out the following table:

Common Wire Size Zone Wire Size
  18 AWG 16 AWG 14 AWG
18 AWG / 1.0 mm 850 ft 1040 ft 1210 ft
16 AWG / 1.2 mm 1040 ft 1340 ft 1650 ft
14 AWG / 1.6 mm 1210 ft 1650 ft 2150 ft
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