diff --git a/static/app/actionCreators/monitors.tsx b/static/app/actionCreators/monitors.tsx
index 3e45c06d2d7a68..60060d8e7349d9 100644
--- a/static/app/actionCreators/monitors.tsx
+++ b/static/app/actionCreators/monitors.tsx
@@ -102,7 +102,7 @@ export async function setEnvironmentIsMuted(
 
   try {
     const resp = await api.requestPromise(
-      `/projects/${orgId}/${monitor.project.slug}/monitors/${monitor.slug}/environments/${environment}`,
+      `/projects/${orgId}/${monitor.project.slug}/monitors/${monitor.slug}/environments/${environment}/`,
       {method: 'PUT', data: {isMuted}}
     );
     clearIndicators();
diff --git a/static/app/views/detectors/components/details/cron/index.spec.tsx b/static/app/views/detectors/components/details/cron/index.spec.tsx
index d5d1e677525ae3..79a4cebb719216 100644
--- a/static/app/views/detectors/components/details/cron/index.spec.tsx
+++ b/static/app/views/detectors/components/details/cron/index.spec.tsx
@@ -342,4 +342,71 @@ describe('CronDetectorDetails - check-ins', () => {
       expect(screen.getByRole('button', {name: 'Enable'})).toBeInTheDocument();
     });
   });
+
+  describe('environment muting', () => {
+    it('refetches detector when environment is muted', async () => {
+      const detectorWithMultipleEnvs = CronDetectorFixture({
+        id: '1',
+        projectId: project.id,
+        dataSources: [
+          CronMonitorDataSourceFixture({
+            queryObj: {
+              ...CronMonitorDataSourceFixture().queryObj,
+              environments: [
+                CronMonitorEnvironmentFixture({
+                  name: 'production',
+                  lastCheckIn: '2025-01-01T00:00:00Z',
+                  isMuted: false,
+                }),
+                CronMonitorEnvironmentFixture({
+                  name: 'staging',
+                  lastCheckIn: '2025-01-01T00:00:00Z',
+                  isMuted: false,
+                }),
+              ],
+            },
+          }),
+        ],
+      });
+
+      const muteRequest = MockApiClient.addMockResponse({
+        url: `/projects/org-slug/${project.slug}/monitors/${detectorWithMultipleEnvs.dataSources[0].queryObj.slug}/environments/production/`,
+        method: 'PUT',
+        body: {},
+      });
+
+      const detectorRefetchRequest = MockApiClient.addMockResponse({
+        url: `/organizations/org-slug/detectors/1/`,
+        body: detectorWithMultipleEnvs,
+      });
+
+      render(
+        <CronDetectorDetails detector={detectorWithMultipleEnvs} project={project} />
+      );
+
+      await screen.findByText('Recent Check-Ins');
+
+      expect(detectorRefetchRequest).toHaveBeenCalledTimes(1);
+
+      const envButtons = screen.getAllByRole('button', {
+        name: 'Monitor environment actions',
+      });
+      await userEvent.click(envButtons[0]!);
+
+      await userEvent.click(
+        await screen.findByRole('menuitemradio', {name: 'Mute Environment'})
+      );
+
+      expect(muteRequest).toHaveBeenCalledTimes(1);
+      expect(muteRequest).toHaveBeenCalledWith(
+        expect.stringContaining('/environments/production'),
+        expect.objectContaining({
+          method: 'PUT',
+          data: {isMuted: true},
+        })
+      );
+
+      expect(detectorRefetchRequest).toHaveBeenCalledTimes(2);
+    });
+  });
 });
diff --git a/static/app/views/detectors/components/details/cron/index.tsx b/static/app/views/detectors/components/details/cron/index.tsx
index 377d0f618eac39..e1364ca64ebab3 100644
--- a/static/app/views/detectors/components/details/cron/index.tsx
+++ b/static/app/views/detectors/components/details/cron/index.tsx
@@ -22,6 +22,7 @@ import {t, tn} from 'sentry/locale';
 import type {Project} from 'sentry/types/project';
 import type {CronDetector} from 'sentry/types/workflowEngine/detectors';
 import toArray from 'sentry/utils/array/toArray';
+import {useQueryClient} from 'sentry/utils/queryClient';
 import {useLocation} from 'sentry/utils/useLocation';
 import useOrganization from 'sentry/utils/useOrganization';
 import {
@@ -35,7 +36,10 @@ import {DisabledAlert} from 'sentry/views/detectors/components/details/common/di
 import {DetectorExtraDetails} from 'sentry/views/detectors/components/details/common/extraDetails';
 import {DetectorDetailsHeader} from 'sentry/views/detectors/components/details/common/header';
 import {DetectorDetailsOpenPeriodIssues} from 'sentry/views/detectors/components/details/common/openPeriodIssues';
-import {useDetectorQuery} from 'sentry/views/detectors/hooks';
+import {
+  makeDetectorDetailsQueryKey,
+  useDetectorQuery,
+} from 'sentry/views/detectors/hooks';
 import {DetailsTimeline} from 'sentry/views/insights/crons/components/detailsTimeline';
 import {DetailsTimelineLegend} from 'sentry/views/insights/crons/components/detailsTimelineLegend';
 import {MonitorCheckIns} from 'sentry/views/insights/crons/components/monitorCheckIns';
@@ -69,6 +73,7 @@ export function CronDetectorDetails({detector, project}: CronDetectorDetailsProp
   const userTimezone = useTimezone();
   const [timezoneOverride, setTimezoneOverride] = useState(userTimezone);
   const openDocsPanel = useDocsPanel(dataSource.queryObj.slug, project);
+  const queryClient = useQueryClient();
 
   useDetectorQuery<CronDetector>(detector.id, {
     staleTime: 0,
@@ -83,6 +88,14 @@ export function CronDetectorDetails({detector, project}: CronDetectorDetailsProp
     },
   });
 
+  const handleEnvironmentUpdated = useCallback(() => {
+    const queryKey = makeDetectorDetailsQueryKey({
+      orgSlug: organization.slug,
+      detectorId: detector.id,
+    });
+    queryClient.invalidateQueries({queryKey});
+  }, [queryClient, organization.slug, detector.id]);
+
   const {checkinErrors, handleDismissError} = useMonitorProcessingErrors({
     organization,
     projectId: project.id,
@@ -174,6 +187,7 @@ export function CronDetectorDetails({detector, project}: CronDetectorDetailsProp
                 <DetailsTimeline
                   monitor={filteredMonitor}
                   onStatsLoaded={checkHasUnknown}
+                  onEnvironmentUpdated={handleEnvironmentUpdated}
                 />
                 <ErrorBoundary mini>
                   <DetectorDetailsOpenPeriodIssues
diff --git a/static/app/views/insights/crons/components/detailsTimeline.tsx b/static/app/views/insights/crons/components/detailsTimeline.tsx
index 201a18495ec04e..fd47071a1983a1 100644
--- a/static/app/views/insights/crons/components/detailsTimeline.tsx
+++ b/static/app/views/insights/crons/components/detailsTimeline.tsx
@@ -30,13 +30,17 @@ import {CronServiceIncidents} from './serviceIncidents';
 
 interface Props {
   monitor: Monitor;
+  /**
+   * Called when an environment is updated (muted/unmuted/deleted).
+   */
+  onEnvironmentUpdated?: () => void;
   /**
    * Called when monitor stats have been loaded for this timeline.
    */
   onStatsLoaded?: (stats: MonitorBucket[]) => void;
 }
 
-export function DetailsTimeline({monitor, onStatsLoaded}: Props) {
+export function DetailsTimeline({monitor, onStatsLoaded, onEnvironmentUpdated}: Props) {
   const organization = useOrganization();
   const location = useLocation();
   const api = useApi();
@@ -89,6 +93,8 @@ export function DetailsTimeline({monitor, onStatsLoaded}: Props) {
           }
         : undefined;
     });
+
+    onEnvironmentUpdated?.();
   };
 
   const handleToggleMuteEnvironment = async (env: string, isMuted: boolean) => {
@@ -119,6 +125,8 @@ export function DetailsTimeline({monitor, onStatsLoaded}: Props) {
           }
         : undefined;
     });
+
+    onEnvironmentUpdated?.();
   };
 
   return (