diff --git a/homeassistant/components/rachio/const.py b/homeassistant/components/rachio/const.py
index c9605712522..aad3593eed5 100644
--- a/homeassistant/components/rachio/const.py
+++ b/homeassistant/components/rachio/const.py
@@ -60,6 +60,10 @@ RACHIO_API_EXCEPTIONS = (
 
 STATUS_ONLINE = "ONLINE"
 
+SCHEDULE_TYPE_FIXED = "FIXED"
+SCHEDULE_TYPE_FLEX = "FLEX"
+SERVICE_SET_ZONE_MOISTURE = "set_zone_moisture_percent"
+
 SIGNAL_RACHIO_UPDATE = f"{DOMAIN}_update"
 SIGNAL_RACHIO_CONTROLLER_UPDATE = f"{SIGNAL_RACHIO_UPDATE}_controller"
 SIGNAL_RACHIO_RAIN_DELAY_UPDATE = f"{SIGNAL_RACHIO_UPDATE}_rain_delay"
diff --git a/homeassistant/components/rachio/services.yaml b/homeassistant/components/rachio/services.yaml
new file mode 100644
index 00000000000..0b22a0953a0
--- /dev/null
+++ b/homeassistant/components/rachio/services.yaml
@@ -0,0 +1,9 @@
+set_zone_moisture_percent:
+  description: Set the moisture percentage of a zone or group of zones.
+  fields:
+    entity_id:
+      description: Name of the zone entity. Can also be a group of zones. [Required]
+      example: "switch.front_yard"
+    percent:
+      description: Set the desired zone moisture percentage from 0 to 100. [Required]
+      example: 50
diff --git a/homeassistant/components/rachio/switch.py b/homeassistant/components/rachio/switch.py
index 9a656b5feb0..6fa992adb81 100644
--- a/homeassistant/components/rachio/switch.py
+++ b/homeassistant/components/rachio/switch.py
@@ -3,8 +3,11 @@ from abc import abstractmethod
 from datetime import timedelta
 import logging
 
+import voluptuous as vol
+
 from homeassistant.components.switch import SwitchEntity
 from homeassistant.core import callback
+from homeassistant.helpers import config_validation as cv, entity_platform
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.event import async_track_point_in_utc_time
 from homeassistant.util.dt import as_timestamp, now, parse_datetime, utc_from_timestamp
@@ -28,8 +31,12 @@ from .const import (
     KEY_SCHEDULE_ID,
     KEY_SUBTYPE,
     KEY_SUMMARY,
+    KEY_TYPE,
     KEY_ZONE_ID,
     KEY_ZONE_NUMBER,
+    SCHEDULE_TYPE_FIXED,
+    SCHEDULE_TYPE_FLEX,
+    SERVICE_SET_ZONE_MOISTURE,
     SIGNAL_RACHIO_CONTROLLER_UPDATE,
     SIGNAL_RACHIO_RAIN_DELAY_UPDATE,
     SIGNAL_RACHIO_SCHEDULE_UPDATE,
@@ -55,9 +62,11 @@ from .webhooks import (
 
 _LOGGER = logging.getLogger(__name__)
 
+ATTR_PERCENT = "percent"
 ATTR_SCHEDULE_SUMMARY = "Summary"
 ATTR_SCHEDULE_ENABLED = "Enabled"
 ATTR_SCHEDULE_DURATION = "Duration"
+ATTR_SCHEDULE_TYPE = "Type"
 ATTR_ZONE_NUMBER = "Zone number"
 ATTR_ZONE_SHADE = "Shade"
 ATTR_ZONE_SLOPE = "Slope"
@@ -67,11 +76,24 @@ ATTR_ZONE_TYPE = "Type"
 
 async def async_setup_entry(hass, config_entry, async_add_entities):
     """Set up the Rachio switches."""
-    # Add all zones from all controllers as switches
+    has_flex_sched = False
     entities = await hass.async_add_executor_job(_create_entities, hass, config_entry)
+    for entity in entities:
+        if isinstance(entity, RachioSchedule) and entity.type == SCHEDULE_TYPE_FLEX:
+            has_flex_sched = True
+            break
+
     async_add_entities(entities)
     _LOGGER.info("%d Rachio switch(es) added", len(entities))
 
+    platform = entity_platform.current_platform.get()
+    if has_flex_sched:
+        platform.async_register_entity_service(
+            SERVICE_SET_ZONE_MOISTURE,
+            {vol.Required(ATTR_PERCENT): cv.positive_int},
+            "set_moisture_percent",
+        )
+
 
 def _create_entities(hass, config_entry):
     entities = []
@@ -355,6 +377,11 @@ class RachioZone(RachioSwitch):
         """Stop watering all zones."""
         self._controller.stop_watering()
 
+    def set_moisture_percent(self, percent) -> None:
+        """Set the zone moisture percent."""
+        _LOGGER.debug("Setting %s moisture to %s percent", self._zone_name, percent)
+        self._controller.rachio.zone.setMoisturePercent(self._id, percent / 100)
+
     @callback
     def _async_handle_update(self, *args, **kwargs) -> None:
         """Handle incoming webhook zone data."""
@@ -391,6 +418,7 @@ class RachioSchedule(RachioSwitch):
         self._duration = data[KEY_DURATION]
         self._schedule_enabled = data[KEY_ENABLED]
         self._summary = data[KEY_SUMMARY]
+        self.type = data.get(KEY_TYPE, SCHEDULE_TYPE_FIXED)
         self._current_schedule = current_schedule
         super().__init__(controller)
 
@@ -416,6 +444,7 @@ class RachioSchedule(RachioSwitch):
             ATTR_SCHEDULE_SUMMARY: self._summary,
             ATTR_SCHEDULE_ENABLED: self.schedule_is_enabled,
             ATTR_SCHEDULE_DURATION: f"{round(self._duration / 60)} minutes",
+            ATTR_SCHEDULE_TYPE: self.type,
         }
 
     @property