diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80b2f725d68..ad44b19d754 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,4 @@
+- Fix bug where deploying Firestore function resulted in redudant API calls to the Firestore API (#6583).
 - Fix an issue preventing Vite applications from being emulated on Windows. (#6411)
 - Addressed an issue preventing Astro applications from being deployed from Windows. (#5709)
 - Fixed an issue preventing Angular apps using ng-deploy from being emulated or deployed. (#6584)
diff --git a/src/deploy/functions/services/firestore.ts b/src/deploy/functions/services/firestore.ts
index d4eb39b45d5..dade0774b8e 100644
--- a/src/deploy/functions/services/firestore.ts
+++ b/src/deploy/functions/services/firestore.ts
@@ -2,6 +2,24 @@ import * as backend from "../backend";
 import * as firestore from "../../../gcp/firestore";
 import { FirebaseError } from "../../../error";
 
+const dbCache = new Map<string, firestore.Database>();
+
+/**
+ * A memoized version of firestore.getDatabase that avoids repeated calls to the API.
+ *
+ * @param project the project ID
+ * @param databaseId the database ID or "(default)"
+ */
+async function getDatabase(project: string, databaseId: string): Promise<firestore.Database> {
+  const key = `${project}/${databaseId}`;
+  if (dbCache.has(key)) {
+    return dbCache.get(key)!;
+  }
+  const db = await firestore.getDatabase(project, databaseId);
+  dbCache.set(key, db);
+  return db;
+}
+
 /**
  * Sets a firestore event trigger's region to the firestore database region.
  * @param endpoint the firestore endpoint
@@ -9,7 +27,7 @@ import { FirebaseError } from "../../../error";
 export async function ensureFirestoreTriggerRegion(
   endpoint: backend.Endpoint & backend.EventTriggered
 ): Promise<void> {
-  const db = await firestore.getDatabase(
+  const db = await getDatabase(
     endpoint.project,
     endpoint.eventTrigger.eventFilters?.database || "(default)"
   );
diff --git a/src/gcp/firestore.ts b/src/gcp/firestore.ts
index e5897c75f66..c870fa95485 100644
--- a/src/gcp/firestore.ts
+++ b/src/gcp/firestore.ts
@@ -8,7 +8,7 @@ const apiClient = new Client({
   urlPrefix: firestoreOrigin,
 });
 
-interface Database {
+export interface Database {
   name: string;
   uid: string;
   createTime: string;