diff --git a/src/app/(app)/collection-pool/components.tsx b/src/app/(app)/collection-pool/components.tsx
index 87d28c5..c85f369 100644
--- a/src/app/(app)/collection-pool/components.tsx
+++ b/src/app/(app)/collection-pool/components.tsx
@@ -177,7 +177,13 @@ export function PoolRow({
         </div>
 
         <div className="flex flex-col items-stretch gap-2 lg:min-w-[11rem]">
-          <Button size="sm" variant={isAssigned ? "outline" : "default"} onClick={() => onOpenAssign(row)} disabled={busy}>
+          <Button
+            size="sm"
+            variant={isAssigned ? "outline" : "default"}
+            onClick={() => onOpenAssign(row)}
+            disabled={busy || !row.ready_for_collection}
+            title={!row.ready_for_collection ? "Mark this stop as ready before assigning" : undefined}
+          >
             {isAssigned ? "Reschedule" : "Assign Driver"}
           </Button>
           <Button
@@ -243,6 +249,15 @@ export function SupplierGroup({
     (r) => getAssignmentState(r, todayYmd) !== "unassigned",
   );
 
+  // Compute which rows WOULD be assigned if the user clicked the bulk
+  // assign button. The same gating rule from PoolRow applies here: a
+  // row can only be assigned once it's marked ready.
+  const targetRows = allSelected || selectedCount === 0
+    ? group.rows
+    : group.rows.filter((r) => selectedIds.has(r.id));
+  const unreadyTargetCount = targetRows.filter((r) => !r.ready_for_collection).length;
+  const allTargetsReady = unreadyTargetCount === 0;
+
   const eyebrowText = (() => {
     if (group.topPoNumbers.length === 0) return null;
     const head = group.topPoNumbers.map((p) => `PO ${p}`).join(", ");
@@ -257,6 +272,12 @@ export function SupplierGroup({
       ? `Assign ${selectedCount} selected`
       : `Assign all ${rowIds.length}`;
 
+  const assignDisabledReason = allAssigned
+    ? "Every stop at this supplier is already assigned"
+    : !allTargetsReady
+      ? `${unreadyTargetCount} ${unreadyTargetCount === 1 ? "stop" : "stops"} not marked ready — mark ready before assigning`
+      : undefined;
+
   const onAssignClick = () => {
     const ids = allSelected || selectedCount === 0 ? rowIds : rowIds.filter((id) => selectedIds.has(id));
     onOpenBulkAssign(group.supplierId, group.supplierName, ids);
@@ -301,8 +322,8 @@ export function SupplierGroup({
           <Button
             size="sm"
             onClick={onAssignClick}
-            disabled={busy || allAssigned}
-            title={allAssigned ? "Every stop at this supplier is already assigned" : undefined}
+            disabled={busy || allAssigned || !allTargetsReady}
+            title={assignDisabledReason}
           >
             <Truck className="mr-1.5 size-3.5" />
             {assignLabel}