diff --git a/.changeset/orange-flowers-post.md b/.changeset/orange-flowers-post.md
new file mode 100644
index 0000000000..636873d999
--- /dev/null
+++ b/.changeset/orange-flowers-post.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/query-core': patch
+---
+
+fix useQueries race condition on queries length change (#9971)
diff --git a/packages/query-core/src/queriesObserver.ts b/packages/query-core/src/queriesObserver.ts
index 0590e1e995..a8ad40a029 100644
--- a/packages/query-core/src/queriesObserver.ts
+++ b/packages/query-core/src/queriesObserver.ts
@@ -106,7 +106,6 @@ export class QueriesObserver<
       const prevObservers = this.#observers
 
       const newObserverMatches = this.#findMatchingObservers(this.#queries)
-      this.#observerMatches = newObserverMatches
 
       // set options for the new observers to notify of changes
       newObserverMatches.forEach((match) =>
@@ -134,6 +133,7 @@ export class QueriesObserver<
       if (!hasStructuralChange && !hasResultChange) return
 
       if (hasStructuralChange) {
+        this.#observerMatches = newObserverMatches
         this.#observers = newObservers
       }