diff --git a/src/addon/mod/forum/components/index/addon-mod-forum-index.html b/src/addon/mod/forum/components/index/addon-mod-forum-index.html
index 497f32f02..f0f1fa603 100644
--- a/src/addon/mod/forum/components/index/addon-mod-forum-index.html
+++ b/src/addon/mod/forum/components/index/addon-mod-forum-index.html
@@ -97,7 +97,7 @@
             <core-infinite-loading [enabled]="canLoadMore" (action)="fetchMoreDiscussions($event)" [error]="loadMoreError"></core-infinite-loading>
         </core-loading>
 
-        <ion-fab core-fab bottom end *ngIf="forum && forum.cancreatediscussions">
+        <ion-fab core-fab bottom end *ngIf="forum && canAddDiscussion">
             <button ion-fab (click)="openNewDiscussion()" [attr.aria-label]="addDiscussionText">
                 <ion-icon name="add"></ion-icon>
             </button>
diff --git a/src/addon/mod/forum/components/index/index.ts b/src/addon/mod/forum/components/index/index.ts
index 60ee32288..762df73f4 100644
--- a/src/addon/mod/forum/components/index/index.ts
+++ b/src/addon/mod/forum/components/index/index.ts
@@ -48,6 +48,7 @@ export class AddonModForumIndexComponent extends CoreCourseModuleMainActivityCom
     discussions = [];
     offlineDiscussions = [];
     selectedDiscussion = 0; // Disucssion ID or negative timecreated if it's an offline discussion.
+    canAddDiscussion = false;
     addDiscussionText = this.translate.instant('addon.mod_forum.addanewdiscussion');
     availabilityMessage: string;
 
@@ -199,10 +200,18 @@ export class AddonModForumIndexComponent extends CoreCourseModuleMainActivityCom
                 });
             }
         }).then(() => {
-            // Check if the activity uses groups.
-            return this.groupsProvider.getActivityGroupMode(this.forum.cmid).then((mode) => {
-                this.usesGroups = (mode === CoreGroupsProvider.SEPARATEGROUPS || mode === CoreGroupsProvider.VISIBLEGROUPS);
-            });
+            return Promise.all([
+                // Check if the activity uses groups.
+                this.groupsProvider.getActivityGroupMode(this.forum.cmid).then((mode) => {
+                    this.usesGroups = (mode === CoreGroupsProvider.SEPARATEGROUPS || mode === CoreGroupsProvider.VISIBLEGROUPS);
+                }),
+                this.forumProvider.getAccessInformation(this.forum.id).then((accessInfo) => {
+                    // Disallow adding discussions if cut-off date is reached and the user has not the capability to override it.
+                    // Just in case the forum was fetched from WS when the cut-off date was not reached but it is now.
+                    const cutoffDateReached = this.forumHelper.isCutoffDateReached(this.forum) && !accessInfo.cancanoverridecutoff;
+                    this.canAddDiscussion = this.forum.cancreatediscussions && !cutoffDateReached;
+                }),
+            ]);
         }).then(() => {
             return Promise.all([
                 this.fetchOfflineDiscussion(),
@@ -370,6 +379,7 @@ export class AddonModForumIndexComponent extends CoreCourseModuleMainActivityCom
         if (this.forum) {
             promises.push(this.forumProvider.invalidateDiscussionsList(this.forum.id));
             promises.push(this.groupsProvider.invalidateActivityGroupMode(this.forum.cmid));
+            promises.push(this.forumProvider.invalidateAccessInformation(this.forum.id));
         }
 
         return Promise.all(promises);
diff --git a/src/addon/mod/forum/pages/discussion/discussion.ts b/src/addon/mod/forum/pages/discussion/discussion.ts
index 9d0a44fee..3aee91f1b 100644
--- a/src/addon/mod/forum/pages/discussion/discussion.ts
+++ b/src/addon/mod/forum/pages/discussion/discussion.ts
@@ -318,6 +318,14 @@ export class AddonModForumDiscussionPage implements OnDestroy {
 
                 promises.push(this.forumProvider.getAccessInformation(this.forum.id).then((accessInfo) => {
                     this.accessInfo = accessInfo;
+
+                    // Disallow replying if cut-off date is reached and the user has not the capability to override it.
+                    // Just in case the posts were fetched from WS when the cut-off date was not reached but it is now.
+                    if (this.forumHelper.isCutoffDateReached(forum) && !accessInfo.cancanoverridecutoff) {
+                        posts.forEach((post) => {
+                            post.canreply = false;
+                        });
+                    }
                 }));
 
                 // Fetch the discussion if not passed as parameter.