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:

Valve Wire Sizing (Maximum One-Way Distance in Feet Between Controller and Valve)
Common Wire Size Zone Wire (ft)
  18 16 14 12 10 8 6
18 AWG / 1.0 mm 850 1040 1210 1350 1460 1540 1590
16 AWG / 1.2 mm 1040 1340 1650 1920 2150 2330 2440
14 AWG / 1.6 mm 1210 1650 2150 2630 3080 3450 3700
12 AWG / 2.0 mm 1350 1920 2630 3390 4170 4880 5400
10 AWG / 2.5 mm 1460 2150 3080 4170 5400 6670 7690
8 AWG / 3 mm 1540 2330 3450 4880 6670 8700 10530
6 AWG / 4 mm 1590 2440 3700 5400 7690 10530 13330
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