diff --git a/backend/routes/availability.py b/backend/routes/availability.py
index d4598b3..a0912ce 100644
--- a/backend/routes/availability.py
+++ b/backend/routes/availability.py
@@ -15,16 +15,16 @@ from schemas import (
     SetAvailabilityRequest,
     CopyAvailabilityRequest,
 )
-from shared_constants import MAX_ADVANCE_DAYS
+from shared_constants import MIN_ADVANCE_DAYS, MAX_ADVANCE_DAYS
 
 
 router = APIRouter(prefix="/api/admin/availability", tags=["availability"])
 
 
 def _get_date_range_bounds() -> tuple[date, date]:
-    """Get the valid date range for availability (tomorrow to +30 days)."""
+    """Get the valid date range for availability (using MIN_ADVANCE_DAYS to MAX_ADVANCE_DAYS)."""
     today = date.today()
-    min_date = today + timedelta(days=1)  # Tomorrow
+    min_date = today + timedelta(days=MIN_ADVANCE_DAYS)
     max_date = today + timedelta(days=MAX_ADVANCE_DAYS)
     return min_date, max_date