diff --git a/packages/compass-collection/src/components/collection-header-actions/collection-header-actions.spec.tsx b/packages/compass-collection/src/components/collection-header-actions/collection-header-actions.spec.tsx
index 1450a7566d2..763e81b165b 100644
--- a/packages/compass-collection/src/components/collection-header-actions/collection-header-actions.spec.tsx
+++ b/packages/compass-collection/src/components/collection-header-actions/collection-header-actions.spec.tsx
@@ -54,6 +54,7 @@ describe('CollectionHeaderActions [Component]', function () {
           <CollectionHeaderActions
             namespace="test.test"
             isReadonly={false}
+            isTimeSeries={false}
             onOpenMockDataModal={sinon.stub()}
             hasSchemaAnalysisData={true}
             analyzedSchemaDepth={2}
@@ -221,6 +222,22 @@ describe('CollectionHeaderActions [Component]', function () {
     };
 
     it('should call useAssignment with correct parameters', async function () {
+      await renderCollectionHeaderActions(
+        {
+          namespace: 'test.collection',
+          isReadonly: false,
+        },
+        {},
+        atlasConnectionInfo
+      );
+
+      expect(mockUseAssignment).to.have.been.calledWith(
+        ExperimentTestName.mockDataGenerator,
+        true // trackIsInSample - Experiment viewed analytics event
+      );
+    });
+
+    it('should call useAssignment with trackIsInSample set to false in non-Atlas environments', async function () {
       await renderCollectionHeaderActions({
         namespace: 'test.collection',
         isReadonly: false,
@@ -228,7 +245,23 @@ describe('CollectionHeaderActions [Component]', function () {
 
       expect(mockUseAssignment).to.have.been.calledWith(
         ExperimentTestName.mockDataGenerator,
-        true // trackIsInSample - Experiment viewed analytics event
+        false // Not eligible - no Atlas metadata
+      );
+    });
+
+    it('should call useAssignment with trackIsInSample set to false for readonly collections', async function () {
+      await renderCollectionHeaderActions(
+        {
+          namespace: 'test.collection',
+          isReadonly: true,
+        },
+        {},
+        atlasConnectionInfo
+      );
+
+      expect(mockUseAssignment).to.have.been.calledWith(
+        ExperimentTestName.mockDataGenerator,
+        false // Not eligible - readonly collection
       );
     });
 
@@ -358,6 +391,20 @@ describe('CollectionHeaderActions [Component]', function () {
         expect(button).to.exist;
         expect(button).to.have.attribute('aria-disabled', 'true');
       });
+
+      it('should not show button for time series collections', async function () {
+        await renderCollectionHeaderActions(
+          {
+            isTimeSeries: true,
+          },
+          {},
+          atlasConnectionInfo
+        );
+
+        expect(
+          screen.queryByTestId('collection-header-generate-mock-data-button')
+        ).to.not.exist;
+      });
     });
   });
 });
diff --git a/packages/compass-collection/src/components/collection-header-actions/collection-header-actions.tsx b/packages/compass-collection/src/components/collection-header-actions/collection-header-actions.tsx
index 036ca238716..35238ca9b7f 100644
--- a/packages/compass-collection/src/components/collection-header-actions/collection-header-actions.tsx
+++ b/packages/compass-collection/src/components/collection-header-actions/collection-header-actions.tsx
@@ -63,6 +63,7 @@ function buildChartsUrl(
 type CollectionHeaderActionsProps = {
   namespace: string;
   isReadonly: boolean;
+  isTimeSeries: boolean;
   editViewName?: string;
   sourceName?: string;
   sourcePipeline?: unknown[];
@@ -78,6 +79,7 @@ const CollectionHeaderActions: React.FunctionComponent<
 > = ({
   namespace,
   isReadonly,
+  isTimeSeries,
   editViewName,
   sourceName,
   sourcePipeline,
@@ -99,24 +101,28 @@ const CollectionHeaderActions: React.FunctionComponent<
     'enableGenAISampleDocumentPassing'
   );
 
+  const { database, collection } = toNS(namespace);
+
+  const isMockDataGeneratorEligible = Boolean(
+    atlasMetadata && // Only show in Atlas
+      !isReadonly && // Don't show for readonly collections (views)
+      !isTimeSeries && // Don't show for time series collections
+      !sourceName // sourceName indicates it's a view
+  );
+
   // Get experiment assignment for Mock Data Generator
   const mockDataGeneratorAssignment = useAssignment(
     ExperimentTestName.mockDataGenerator,
-    true // trackIsInSample - this will fire the "Experiment Viewed" event
+    isMockDataGeneratorEligible // Only track eligible collections
   );
 
-  const { database, collection } = toNS(namespace);
-
   // Check if user is in treatment group for Mock Data Generator experiment
   const isInMockDataTreatmentVariant =
     mockDataGeneratorAssignment?.assignment?.assignmentData?.variant ===
     ExperimentTestGroup.mockDataGeneratorVariant;
 
   const shouldShowMockDataButton =
-    isInMockDataTreatmentVariant &&
-    atlasMetadata && // Only show in Atlas
-    !isReadonly && // Don't show for readonly collections (views)
-    !sourceName; // sourceName indicates it's a view
+    isMockDataGeneratorEligible && isInMockDataTreatmentVariant;
 
   const exceedsMaxNestingDepth =
     analyzedSchemaDepth > MAX_COLLECTION_NESTING_DEPTH;
diff --git a/packages/compass-collection/src/components/collection-header/collection-header.tsx b/packages/compass-collection/src/components/collection-header/collection-header.tsx
index 1219529954c..bbca8d22b48 100644
--- a/packages/compass-collection/src/components/collection-header/collection-header.tsx
+++ b/packages/compass-collection/src/components/collection-header/collection-header.tsx
@@ -185,6 +185,7 @@ const CollectionHeader: React.FunctionComponent<CollectionHeaderProps> = ({
         <CollectionHeaderActions
           editViewName={editViewName}
           isReadonly={isReadonly}
+          isTimeSeries={isTimeSeries}
           namespace={namespace}
           sourceName={sourceName}
           sourcePipeline={sourcePipeline}
diff --git a/packages/compass-collection/src/stores/collection-tab.spec.ts b/packages/compass-collection/src/stores/collection-tab.spec.ts
index 0d6ea908085..b773949675a 100644
--- a/packages/compass-collection/src/stores/collection-tab.spec.ts
+++ b/packages/compass-collection/src/stores/collection-tab.spec.ts
@@ -263,6 +263,42 @@ describe('Collection Tab Content store', function () {
           .deep.eq(defaultMetadata);
       });
     });
+
+    it('should not assign experiment for readonly collections', async function () {
+      const assignExperiment = sandbox.spy(() => Promise.resolve(null));
+
+      await configureStore(
+        undefined,
+        {},
+        { assignExperiment },
+        mockAtlasConnectionInfo,
+        undefined,
+        undefined,
+        { ...defaultMetadata, isReadonly: true }
+      );
+
+      // Wait a bit to ensure assignment would have happened if it was going to
+      await new Promise((resolve) => setTimeout(resolve, 50));
+      expect(assignExperiment).to.not.have.been.called;
+    });
+
+    it('should not assign experiment for time series collections', async function () {
+      const assignExperiment = sandbox.spy(() => Promise.resolve(null));
+
+      await configureStore(
+        undefined,
+        {},
+        { assignExperiment },
+        mockAtlasConnectionInfo,
+        undefined,
+        undefined,
+        { ...defaultMetadata, isTimeSeries: true }
+      );
+
+      // Wait a bit to ensure assignment would have happened if it was going to
+      await new Promise((resolve) => setTimeout(resolve, 50));
+      expect(assignExperiment).to.not.have.been.called;
+    });
   });
 
   describe('schema analysis on collection load', function () {
diff --git a/packages/compass-collection/src/stores/collection-tab.ts b/packages/compass-collection/src/stores/collection-tab.ts
index fc404e20c1f..bc310f5768a 100644
--- a/packages/compass-collection/src/stores/collection-tab.ts
+++ b/packages/compass-collection/src/stores/collection-tab.ts
@@ -143,8 +143,11 @@ export function activatePlugin(
     store.dispatch(collectionMetadataFetched(metadata));
 
     // Assign experiment for Mock Data Generator
-    // Only assign when we're connected to Atlas and the org-level setting for AI features is enabled
+    // Only assign when we're connected to Atlas, the org-level setting for AI features is enabled,
+    // and the collection supports the Mock Data Generator feature (not readonly/timeseries)
     if (
+      !metadata.isReadonly &&
+      !metadata.isTimeSeries &&
       connectionInfoRef.current?.atlasMetadata?.clusterName && // Ensures we only assign in Atlas
       isAIFeatureEnabled(preferences.getPreferences()) // Ensures org-level AI features setting is enabled
     ) {