diff --git a/camply/cli.py b/camply/cli.py
index 0b2330c1..110956a3 100644
--- a/camply/cli.py
+++ b/camply/cli.py
@@ -457,6 +457,16 @@ def campgrounds(
     "equipment names include `Tent`, `RV`. `Trailer`, `Vehicle` and are "
     "not case-sensitive.",
 )
+include_walkin_argument = click.option(
+    "--include-walkin",
+    is_flag=True,
+    show_default=True,
+    default=False,
+    help="Include walk-in / non-web-bookable campsites in results. By default "
+    "these are filtered out because they show as 'Available' in the API but "
+    "can't actually be reserved online. Currently honored by the "
+    "ReserveCalifornia and other UseDirect-based providers.",
+)
 equipment_id_argument = click.option(
     "--equipment-id",
     default=None,
@@ -619,6 +629,7 @@ def _get_provider_kwargs_from_cli(
     offline_search_path: Optional[str],
     equipment: Tuple[Union[str, int]],
     equipment_id: Tuple[Union[str, int]],
+    include_walkin: bool,
     day: Optional[Tuple[str]],
 ) -> Tuple[Dict[str, Any], Dict[str, Any]]:
     """
@@ -666,6 +677,7 @@ def _get_provider_kwargs_from_cli(
         "offline_search_path": offline_search_path,
         "equipment": equipment,
         "equipment_id": equipment_id,
+        "include_walkin": include_walkin,
         "days_of_the_week": days_of_the_week,
     }
     search_kwargs = {
@@ -701,6 +713,7 @@ def _get_provider_kwargs_from_cli(
 @notify_first_try_argument
 @equipment_argument
 @equipment_id_argument
+@include_walkin_argument
 @provider_argument
 @debug_option
 @click.pass_obj
@@ -726,6 +739,7 @@ def campsites(
     offline_search_path: Optional[str],
     equipment: Tuple[Union[str, int]],
     equipment_id: Tuple[Union[str, int]],
+    include_walkin: bool,
     day: Optional[Tuple[str]],
 ) -> None:
     """
@@ -767,6 +781,7 @@ def campsites(
             offline_search_path=offline_search_path,
             equipment=equipment,
             equipment_id=equipment_id,
+            include_walkin=include_walkin,
             day=day,
             yaml_config=yaml_config,
         )
diff --git a/camply/providers/usedirect/usedirect.py b/camply/providers/usedirect/usedirect.py
index 65fec63d..af4f33bb 100644
--- a/camply/providers/usedirect/usedirect.py
+++ b/camply/providers/usedirect/usedirect.py
@@ -367,6 +367,7 @@ def get_campsites(
         sleeping_unit_id: Optional[int] = None,
         unit_sort: Optional[str] = "orderby",
         in_season_only: Optional[bool] = True,
+        include_walkin: bool = False,
     ) -> List[AvailableCampsite]:
         """
         Get Campsites from UseDirect
@@ -425,7 +426,17 @@ def get_campsites(
                     unit=unit,
                 )
                 campsite_available = campsite.availability_status == "Available"
-                if campsite_available is True:
+                # The API reports walk-in / non-web-bookable slices as
+                # "Available" but they can't actually be reserved online.
+                # IsWalkin can be set per-night even on units whose
+                # AllowWebBooking is True (a normally bookable site that's
+                # held back for walk-ups on specific dates), so both flags
+                # matter. Pass through unfiltered when --include-walkin is set.
+                is_bookable = (
+                    availability_slice.IsWalkin is not True
+                    and unit.AllowWebBooking is not False
+                )
+                if campsite_available is True and (include_walkin or is_bookable):
                     if (
                         len(self.campsite_ids) == 0
                         or campsite.campsite_id in self.campsite_ids
diff --git a/camply/search/search_usedirect.py b/camply/search/search_usedirect.py
index 9827ebaf..01be7946 100644
--- a/camply/search/search_usedirect.py
+++ b/camply/search/search_usedirect.py
@@ -53,6 +53,7 @@ def __init__(
         weekends_only: bool = False,
         campgrounds: Optional[Union[List[str], str]] = None,
         nights: int = 1,
+        include_walkin: bool = False,
         **kwargs,
     ) -> None:
         """
@@ -78,6 +79,7 @@ def __init__(
             nights=nights,
             **kwargs,
         )
+        self.include_walkin: bool = include_walkin
         self._recreation_area_ids: List[int] = make_list(recreation_area, coerce=int)
         self._campground_ids: List[int] = make_list(campgrounds, coerce=int)
         campsites = make_list(kwargs.get("campsites", []), coerce=int) or []
@@ -145,6 +147,7 @@ def get_all_campsites(self, **kwargs: Dict[str, Any]) -> List[AvailableCampsite]
                     campground_id=campground.facility_id,
                     start_date=month,
                     end_date=end_date,
+                    include_walkin=self.include_walkin,
                 )
                 logger.info(
                     f"\t{logging_utils.get_emoji(campsites)}\t"